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[Articles Home]  [Add Article]  

160-6 Meter Amp for Mobile Use

Eric Bott (N3TVV) on March 23, 2004
View comments about this article!

I've only been a general a few months, and have been thinking of investing in one of these new HF, VHF, and UHF mobile rigs.

Yes, the HF Bug Bit me pretty hard...

As I page through many books such as HRO or AES, etc.... and try to determine, exactly what kind rig do I want to get? Well, No matter if it's an Icom, Yaesu, Kenwood or whatever I may choose, I still see one particular problem. Sure each of these rigs has it's advantages and each has a bell or whistle the other doesn't, but… My gripe is this: Why as they're making these rigs for "easy mobile operation" are they not making a matching amplifier for mobile use on the HF and six-meter bands?

The only amp I see for HF through six-meters is the Yaesu Quadra System, and I don't know about you but I certainly wouldn't want to have to carry around an inverter for this Monster. -- Even if the amp is only for 80-6 meters or 40-6 meters.

You could go the typical route and get a couple of duplexers and hook up your separate amps for one antenna, but, that just sounds silly to me, with the loss involved, (which isn't much), or getting a bad duplexer or having one go bad while transmitting, or even if the power rating turns out to be an issue. These rigs are supposed to be easy hook up and are way to expensive to be blowing finals because of any of the problems listed, or not listed above.

So, why not make an amp to put right inline between the rig and the antenna and "Keep It Simple"? It may sound lazy to some, but, from what I learned so far about ham radio, it just makes sense to me.

That's my gripe! -- Thanks for listening.

N3TVV

"Less Connections = Less RFI"

Member Comments:
This article has expired. No more comments may be added.
 
160-6 Meter Amp for Mobile Use  
by N6AJR on March 23, 2004 Mail this to a friend!
If you want a mobile amp try the ameritron ALS 500, nice little amp easy to use and set up. I use an ft 840, a mfj tuner and a 40 meter and a 10 meter stick and it works fine on hf and I have an icom 2 meter rig running barefoot.

I don't do any 6 m mobile. If 6 is in you don't need an amp and if it is out it won't help any how.. there are two 6 meter amps on ebay right now , 1 at 150 watts and 1 at 350 watts but I know of no amps like that with 160 to 6 meters but somone else may, just put up something and have fun.

Search on elmers search for mobile instlations..

73 tom N6AJR

( too bad you can't run a fan dipole mobile)
 
160-6 Meter Amp for Mobile Use  
by DROLLTROLL on March 23, 2004 Mail this to a friend!
I guess because only in North America do we drive large enough cars with large enough alternators to support the current draw of power amps. The rest of the world drives flyweight cars with tiny alternators. So my guess would be that the market isn't large enough, currently speaking (pun intended).
 
160-6 Meter Amp for Mobile Use  
by W4TYU on March 23, 2004 Mail this to a friend!
Even in the United States, the market is not large enough to support the production of such an amplifier.

I am reminded of an advertisment that appeared in CQ many mnay years ago. It was for a "Mobile Kilowatt station COMPLETE with a 1947 Ford Coupe". Of course it was completly homebrew and took up the entire vehicle except for the drivers seat.

Ole man JEAN

 
RE: 160-6 Meter Amp for Mobile Use  
by N3JWN on March 23, 2004 Mail this to a friend!
Alen I think you need to change your thinking on this Running power situation. Your right on the rug you choose. The Yaesu ft-100d had much better overall filtering than most rigs.. The new Kenwood 480 series sat has a built in tuner the other model has an 200 watt RF deck no tuner. Personally I run the ICOM 706MKIIg and with planned good installation I get no motor or road noise!!! I wanted to run at least 40-6 meters on HF so O opted for the AH-4 tuner /102" whip/and 75 meter Ham stick for 80 meters with 100 watts I've made 100's of contacts on all bands... A much better overall antenna is the High-Seriah screw driver type antennas which will give you a much better higher "Q" antenna at least for the lower bands...In making many tests the screw driver(with another mobile same radio) pertinently got better signal reports than my 102" whip..on 80 & 40 Meters only!!! My point is the antenna system is much cheaper more efficient, than throwing power on to the band where obviously you haven't even worked mobile yet/ don't for get Band conditions /time of dat your location.....on 29.000 AM I work Europe and all over the US with 40 watts ... and 5/9 10/9 signals from 1-3:30 pm east coast time almost every day.... You should never throw Power in to the equation unless you really need it!! It wouldn't suprise me if the FCC limited amateurs to say 200 watts...PERIOD it would sure even the playing field..... there are thousands of contacts to be made with Minimum power you need to get out there and try first rather than complaining about available Power you can buy. You can always build one ... and check the difference in s/units.DB in the difference between 100 watts and say 800 watts it's ( can't find the info right now!)not really that much and that's a FACT!!And MY opinion, Be safe and have fun HF mobeling as I do every day... Dick / n3jwn
 
160-6 Meter Amp for Mobile Use  
by N4HRA on March 23, 2004 Mail this to a friend!
Why run a amp, I run a Kenwood TSB-2000 with ham sticks, and can talk the world.
I have the ham sticks tuned for each band for the lowest SWR and use the Kenwood internal ATU to trim them out

My 2 cents
Lew
N4HRA
 
RE: 160-6 Meter Amp for Mobile Use  
by N8FVJ on March 23, 2004 Mail this to a friend!
The manufactures are pretty keen to the market place. I suspect the market for such an amp would not result in enough sales to realize a profit after all the development costs.
 
RE: 160-6 Meter Amp for Mobile Use  
by K0BG on March 23, 2004 Mail this to a friend!
Running high power mobile is a whole new ball game especially if you've never done it before. It is expensive and even if you buy that nearly worthless MFJ unit you're still going to layout $1,000 by the time you purchase an antenna that will stay with it. Opt for an SGC and you can easily double that amount.

As for 6 meters, 100 watts is plenty if the band is open. If it isn't, a big amp and large yagi will not help.

Alan, KØBG
 
RE: 160-6 Meter Amp for Mobile Use  
by K5DVW on March 23, 2004 Mail this to a friend!
Your money and time would be better spent improving the mobile antenna.

Think about this for a second. If you happen to run a 1 KW amplifier off your vehicle's power system, after you consider the current draw of the amplifier and the current the rig would require, you're looking at more than 150 amps at RF peak power. You'd need a spare alternator, battery and jumper cable sized wires to the amplifier. So, even though it sounds sexy, it's impossible to just buy an HF amplifier, stick it in the car and go mobile with it. It takes some engineering which most people aren't willing or able to do.

Also, getting any significant power out of RF amplifiers running off of 13.8 VDC is an expensive proposition. That's why you dont see many 12V high power amplifiers offered, and you certainly dont find them cheap.

Yet, some people are crazy and still do it.
 
RE: 160-6 Meter Amp for Mobile Use  
by KB2FCV on March 23, 2004 Mail this to a friend!
Another thing I'm thinking of.. would running 1+ Kw be good for the car's computer system? I could see it now.. you key up, the car's computer is overloaded with RF.. car shuts off!

Sounds like you would need an awful lot of amperage and heavy cable to run that amp, not to mention upgrading the battery, adding a second alternator, etc. The only type of vehicle I have ever heard of people running amps in are the big Tractor-Trailers. Those vehicles already are equipped with multiple batteries and huge alternators. A car simply isn't designed to handle such a current draw.
 
RE: 160-6 Meter Amp for Mobile Use  
by N4LI on March 23, 2004 Mail this to a friend!
> Another thing I'm thinking of.. would running 1+ Kw be good for the car's computer system?

What about the RF exposure issues, too? A Kw on -- say -- 10m would be an issue with an antenna only a few feet away from those inside the car.

1000w on 6m? Even worse.

One occasionally sees CBers running 1000w or even more from their pickups. But, perhaps that is not such a bad thing. That much RF may impact their fertility and ability to breed. :) Darwin in action...

Peter, N4LI
 
RE: 160-6 Meter Amp for Mobile Use  
by KJ7XJ on March 23, 2004 Mail this to a friend!
I agree with the posts here. I have run my 100 watt rig in the car and at home. I have talked all over the world with excellent reports. An amp would only pump things up an S unit, maybe 2 (depending on wattage). Your talking alot more money to give the other guy alittle more needle. (which I would agree could make the difference on a contact) I have looked at the solid state car amps, and they look pretty. However, like the previous posts, I would have to consider another battery and alternator. (not to mention my Ford's computer). Ah yes, but in a perfect world.....

KJ7XJ (still 100 watt qrp after all these years)
 
160-6 Meter Amp for Mobile Use  
by G0GQK on March 23, 2004 Mail this to a friend!
The reason you cannot purchase such an amplifier is because there is no demand. And it would be expensive .Quite a few million American motorists now drive the more efficient European or Japanese designed cars and the power provided is quite sufficient for the need of the vehicle. But if I can speak to Hawaii from the middle of the UK with 40 watts through a Hustler vertical antenna, why do you need an amplifier.?
After all said and done, with all the ground losses involved, if you buy a 400 watt amplifier you will still only be radiating about 40 watts from a mobile vertical antenna ! Unless of course, you use a four element beam at 25 feet in a a portable location.
 
RE: 160-6 Meter Amp for Mobile Use  
by WIRELESS on March 23, 2004 Mail this to a friend!
If engineers can make a space shuttle, in theory they should be able to make an amp covering 1.8 to 54 mhz. I have tried to make an amp 1.8 to 144 mhz and it was impossible to make as a single amp. There were no components that can be made to work over a huge range, but I did come close in many ways. The only way to design one and have it work is to make 2 separate amps put in one box that makes it look like one amp.
 
160-6 Meter Amp for Mobile Use  
by WA2UNN on March 23, 2004 Mail this to a friend!
Communications Concepts in Ohio sells parts, pc boards and has reprints of application notes from Motorola including a 2-50 MHz , 1000 watt output dual FET one...it uses 50 volt fets but if you know how to build it's a good design (not cheap $$$$$)

Keep the solder flowing

Clark Fishman WA2UNN

cfishman@pica.army.mil
 
160-6 Meter Amp for Mobile Use  
by W2NSF on March 23, 2004 Mail this to a friend!
Eric, Eric, Eric!
Your English teacher is rolling over in her grave!!

"FEWER connections, less RFI."

Thank you for your attention. ;-)
Jim
 
160-6 Meter Amp for Mobile Use  
by AB2OL on March 23, 2004 Mail this to a friend!
Don't worry about running high power until you get your feet wet in HF mobile first. 1KW is 10X 100W, or 10dB over 100W, which is not even 2 S-units on a calibrated meter (an S-unit is 6dB if I am not mistaken).
I run an Icom 706MKIIG in the mobile with a High Sierra screwdriver antenna. Back in 2002, just as we were coming off the peak of the solar cycle, I was running that setup and busting 20M SSB pileups. Not on "the first try" mind you, but I was getting in. I remember a remark from Bob,9K2GS on 20M "Wow, nice signal for a mobile" You won't have luck that good as we head towards the bottom of the cycle, but neither will anyone else. I get good reports from single hops on 40M, and 80M is pushing the envelope for a small, loaded, vertical whip.
You'll have tons o' fun and save tons o' money running "barefoot"

73 ES have fun with it
Pat, AI4AQ (ex AB2OL)
 
160-6 Meter Amp for Mobile Use  
by NA5XX on March 24, 2004 Mail this to a friend!
Why 1kw mobile? You don't need it. When the band is open, a little goes a long way. I made the trip from Oklhoma to Australia on 10 meters using 25 watts. My antenna was a 1/4wave magmount.
 
160-6 Meter Amp for Mobile Use  
by N0VUB on March 24, 2004 Mail this to a friend!
I operate a TS-50 in the pickup but never run 100 watts. Why when 50 watts work fine, a good antenna does make a difference. I have even worked stations on both coasts with an FT-817 5 watt qrp.... no problem!

73
Mark
 
160-6 Meter Amp for Mobile Use  
by KE2IV on March 24, 2004 Mail this to a friend!
Is this one for real?

Why in the heck would you want to run more than a nominal 100W in a mobile (or for that matter, at a home rig)?

I guess this is the "Hummer" wannabe mentality that seems to be afflicting all of us?

Why would anyone need more than even 100W in an HF mobile setup? What does it prove to run more power than that when it is a given is that whatever the power - the inherent antenna limitations (mobile espescially) is the paramount issue?

Does this poster know anything at all about ERP and (remember we're talking HF here) propagation? Err...what time of day does this clown propose to run his 1000W into a Hustler whip or even a screwdriver?

Is he trying to communicate or just fry his brain (perhaps an already accomplished fact) and that of those around him?

I have worked around the world mobile with 100W and a 102" whip (coupled by a tuner).

Is he planning to work grayline on 75M every dawn on his way to work each early AM and blast through the home-based stations?

That's all I can figure.

So what?

Do any of the VEC's who license these clowns even mention the FCC regulation of using the least amount of power to effect a useful communication path?

For cryin' out loud, if you want to impress the world figure out another way other that "slam-blasting" the ham bands!

[And I'll also bet a ham's donut that you jack the Mic Gain way up on your rig too - figuring it will be impressive - when all it is is distortion!]

KE2IV
 
160-6 Meter Amp for Mobile Use  
by K8DIT on March 24, 2004 Mail this to a friend!
My Solution is a Ten Tec Scout, Metron amp and a set of hamsticks. The car is a Toyota Corolla. For the last two and a half years I have been really happy at the results with this setup. Items that make it easier are the Autek anenna analyzer, roof mounted mag mount, base matching coil, all from Lakewood Antennas,
and tilting the mobile antenna back about 45deg. by tying the top of the stinger with a nylon line to trunk lock. Doing this affects nothing related with SWR but lets me get into my carport w/o dinging it with the mobile whip.
 
RE: 160-6 Meter Amp for Mobile Use  
by K0BG on March 24, 2004 Mail this to a friend!
Let me add a few facts. I run 500 watts out mobile from 75 through 10 meters. In order to do this I have spent nearly $5,000! The car came equipped with a 160 amp alternator, to which I added a second, trunk-mounted battery, SGC's SG235 coupler and SG500 amp. The home brew antenna is nearly 14 feet in length, uses a spring that cost $100. I had to home brew backing plate for the antenna ballmount which I made out of Delrin plastic. The chunk of Delrin cost me $78, and the circle blade and spindle to cut out the 4" backing plate cost $59. This in an effort to minimize the arcing which caused 3 standard backing plates to fail. Add in all of the other problems like RFI to just about every on-board system and the now 35 split beads (about $175 worth) used to quell the RFI, and after 4 months of almost daily fixes, I'm just now begaining to enjoy the fruits of my labor. You might want to think again.

BTW what I said about the MFJ SS amp is true. It isn't worth half what it costs and on a good day just might put out 400 watts into a dummy load if you feed it with 14.5VDC.

Alan, KØBG
 
RE: 160-6 Meter Amp for Mobile Use  
by NO9E on March 24, 2004 Mail this to a friend!
A much simpler and cheaper alternative to an amp for mobile is RF speech processor.

A 100W mobile radio has an average 10W on SSB. With 400W, the average will be 40W. A 100W radio with RF speech processor produces 40W average power but will still use 20A max.

When I hook up an external RF processor to my FT-100D, reports are usually 1-2 S stronger. This processor takes 20mA/12V. External processor is not as good as the built-in since there is some interaction with ALC.

DF4ZS (?) manufactures small RF processors that fit inside a microphone.

I am not sure if any mobile radio has RF speech processor. Perhaps the smallest would be TS-2000.

Ignacy, NO9E
 
RE: 160-6 Meter Amp for Mobile Use  
by X-WB1AUW on March 24, 2004 Mail this to a friend!
Congrats on your upgrade to general; only one more to go.

In essence, you don’t see, for sale, what you think is a good idea, because few people would buy such a product. The market place has many more years of experience than you do, likewise, manufactures of ham radio products.

The marginal cost to make a rig operate on 160 is insignificant. Since we see rigs on 160 thru 6 meters now, I assume the marginal cost to go from 10 meters to 6 meters is rather small, but increases the number of rigs sold.

However, getting antennas that operate well on the low bands is no small feat; not as simple as getting a rig to operate on the low bands. If you look at beams, you’ll notice there aren’t any beams that operate from 160-6 meters. To get a vertical to operate on 160-6 meters, a lot of sacrifices in the antenna’s performance, have to be made.

Getting antennas to cover 160-6 meters on a vehicle is difficult, a lot of sacrifices in the antenna’s performance have to be made.

With few vehicles covering 160-6 meters, there is little demand for an mobile amplifier to cover 160-6 meters. With few amps being used mobile, covering 160-6 meters, there is even smaller demand for “antenna” tuners covering 160-6 meters that can handle mobile amps.

Have FUN
Bob
 
160-6 Meter Amp for Mobile Use  
by KB7GJY on March 24, 2004 Mail this to a friend!
Ok, now alot of people have had their say. Yes RFI, power requirments, etc. etc. etc. are valid points. As for the market won't support I have problems with this point. Can anyone give me a list of people that are on the waiting list cash money paid for the new Icom 7800 (believe that is the right number hihi). The prices I have heard is close to 10k US dollars.. My father used to own a ham store and I had the bragging rights of being able to use the Icom 781 in the early 90's. now who in there right mind would fork out as I recall close to 4k (price may be incorrect) for that radio, very few. Yes it was the top of the line base in its time, but who is to say that a owner operator in a semi-truck who drives over the road wouldn't want a top of the line rig for his "home". Not trying to flame, and I agree running 1 KW or 1.5 KW mobile, I dont want to be around you, but I may ask you to to hold my dinner so it can be cooked well done, while you have your QSO (hi hi).

73's
Allen KB7GJY
 
160-6 Meter Amp for Mobile Use  
by N3TVV on March 25, 2004 Mail this to a friend!
I was just curious ,why they didn't make such an amp and have found SOME good logical explanations

I never said That I was going to run 1000 watts in my mobile.I Have no where people come up with these insane ideas, maybe a couple of those closet Cbers . I also know enough about Rf exposure not to do such a silly thing.Because 1000 watts with an antenna 10 ft away from you (if you're lucky),sounds like(1)a lack of common sense,(2)brain damage waiting to happen.)

The only way to find out answers is to ask questions.

Isn't that what these forums are for? ?

I wanted to ask about this, before I got into experimenting with Hf mobile to help me get my feet wet.

N3TVV

Ps.. I Never claimed to be an english major
 
160-6 Meter Amp for Mobile Use  
by W7WIK on March 25, 2004 Mail this to a friend!
What do you need an amp for? I've worked the world with 25 watts and a hamstick, mobile.

Bigger-better-faster-more, humvee mentality, I guess.

 
RE: 160-6 Meter Amp for Mobile Use  
by K1CJS on March 25, 2004 Mail this to a friend!
Can you say 'excessive RF exposure?'
 
160-6 Meter Amp for Mobile Use  
by K8DIT on March 25, 2004 Mail this to a friend!
Eric, You are beginning to see that running QRO in a mobile is a controversial topic. Did you expect different? So, whatever you do, you'll no doubt feel like a pioneer once you get what it is your looking for working well. I know I did. That's the fun of it.
Humvee mentality notwithstanding, check out some CB mobile shootouts like the Skull Kracka', youll fall off your chair laughing. You can find this with Google.
Ive run all levels of power in mobile hamming from 3W to 500W. When you dont need more than a few watts, itll be obvious, simply leave the amp off. What could be simpler? My current gear cost no more than $1000 for everything, including the xcvr. YMMV.
 
RE: 160-6 Meter Amp for Mobile Use  
by W7DJM on March 25, 2004 Mail this to a friend!
The old Metron MA1000B, also sold under another name, I can't remember anymore. Good for 500 watts out with about 50 watts drive.
 
160-6 Meter Amp for Mobile Use  
by K1MKF on March 25, 2004 Mail this to a friend!
SGC makes a wonderful mobile HF amp. I think it's called a smartcube or something like that. It does not have 6 meters but you could always split the cable and add a 6 meter brick. But really if you can do 6 meters with 100 watts you should be thinking about antenna before amp. When you have that 6 meter beam on your mobile then you can add the 300 watt brick.

MarkF
K1MKF
 
160-6 Meter Amp for Mobile Use  
by F1DFR on March 25, 2004 Mail this to a friend!
Hi !

It is even difficult to buy a simple 350W 6m amp
able to work in a car. TE SYSTEMS seems to have a
0552G model but it's a fake ad. In 2002 I tried to
buy one, they got the money I never received the amp.
I had to ask for a VISA refund. In 2003 I tried a
second time to get one for Christmas, I received their
quotation by fax some hours later, I sent my order by
FAX with VISA payment and got neither order ack nor
amp. I had to cancel the order.
So if you look at the TE SYSTEMS ad in QST February
2004 page 120, you can laugh loudly !!

73s de JM
 
160-6 Meter Amp for Mobile Use  
by K4XR on March 26, 2004 Mail this to a friend!
Hi Eric,

You've had some good answers to you questions as well as some silly ones.

First, such an amp isn't made (as several have already stated) because the market just isn't there. The market isn't there, because there aren't enough mobile operators that will spend the amount of money the amp would cost and go through all the hassles necessary to modify the vehicle to be able to power the amp. Also, with many vehicles, RFI to the vehicle's processors ends up being a problem.

But, the basic thought of having more power available while mobile isn't silly at all. Several of the poorly thought out responses you've received, are along the lines of the one listed directly below -

"Why would anyone need more than even 100W in an HF mobile setup? What does it prove to run more power than that when it is a given is that whatever the power - the inherent antenna limitations (mobile espescially) is the paramount issue? "


The fact that the best mobile antenna available have efficiencies of 10% or less on the 40 and 75 meter bands is one of the best arguments for a mobile amp. Because the antenna efficiency is so low, more power is needed to put out a reasonably good signal on the lower bands. Your ERP will be lower than a home 100W station with a good antenna, even with a full KW amp, but you will be 7 dB (at 500W) and 10 dB (at 1KW) stronger than other 100W mobiles with equal antennas. These two bands (and of course 160) have very high atmospheric noise levels, particularly during the summer months. Many of the more serious mobile operators that love the lower bands do have amplifiers. I wouldn't say that it is a necessity on 40 with a good antenna, but 75, in the summertime' at night is a real struggle without an amp. Quite often the extra 7 db that a 500W amp provides over a 100W radio makes a tremendous difference in readability when the circuit is basically being limited by the atmospheric noise and not propagation.

Something like the TS-480HX may be a reasonable solution. The extra 100W (3 dB) would definitely be helpful at times, and it wouldn't require an extra alternator and battery on most vehicles. I've thought several times that 200W on 60M mobile would be fun, because with a good antenna, you should be reasonably competitive with home stations that are running 50 W into dipoles.

Good luck and hope you enjoy the mobile operation!

 
RE: 160-6 Meter Amp for Mobile Use  
by KD5UJX on March 26, 2004 Mail this to a friend!
After ALL THAT, Here is what you were looking for:

http://www.henryradio.com/amp_specs/sshf.htm
 
160-6 Meter Amp for Mobile Use  
by WIRELESS on March 26, 2004 Mail this to a friend!
Concerning Henry Radio solid state amps, I used one for about a year, no thanks. I got rid of it and never again will I waste my time on Henry amps.
 
160-6 Meter Amp for Mobile Use  
by W8JI on March 26, 2004 Mail this to a friend!
The real reason you don't see a 160-6 meter amplifier is the supply voltage.

It is virtually impossible to get uniform performance from 160-10 meters in a bipolar transistor amplifier running 400-500 watts, let alone one running more power. Adding six meters would be virtually impossible.

The problem is collector impedance is too low for good broadband performance, and all the multiple stages required that must be placed in parallel add to the problems.

The solution would be to use high-power high-voltage high frequency cutoff FET or bipolar devices in amplifiers. That would require a 30-volt or higher power supply.

The most economical solution would be a 6 meter amp and a separate HF amp.

73 Tom

 
RE: 160-6 Meter Amp for Mobile Use  
by W8JI on March 26, 2004 Mail this to a friend!
The reason you cannot purchase such an amplifier is because there is no demand.>>>>>>>>>

Since I design for manufacturers I can tell you first hand that idea is NOT true.

The reasons are 100% technical based on cost and the complexity of doing a switching supply to get 30-volts or more required to allow a broad bandwidth PA stage to be built.

The amplifier would also have to notch 25-35MHz, and not be easily converted to those frequencies for USA sales. It is illegal for ANY manufacturer to sell a kit, a parts kit, or a wired amplifier in the USA that has any of the following:

RF keying

Gain between 25-35 MHz

Drives to rated output with less than 50 watts

The FCC will really eyeball a six meter/HF mobile amp closely thanks to our CB buddies, so I doubt it would ever be allowed with any easy provison for ten meters.

73 Tom
 
RE: 160-6 Meter Amp for Mobile Use  
by PHINEAS on March 26, 2004 Mail this to a friend!
>RF keying

>Gain between 25-35 MHz

>Drives to rated output with less than 50 watts

>The FCC will really eyeball a six meter/HF mobile amp >closely thanks to our CB buddies, so I doubt it would >ever be allowed with any easy provison for ten meters.

I agree with you Tom. As an example, I have tried to make such an amp out of Thomson SD1446 Transisters. These are 12 - 18V Transisters. One of the main things I ran into was stability problems, and getting the same power output over a broadband. Just so happens that these transisters are also frequently used in 10meter(CB) amps.

As far as running more than radio power in a mobile, been there done that. I have found that running power only makes up for a poor antenna system, and causes RF headaches. I was running a 600watt home brew job. I have tried many types of mobile antennas and found that the better my antenna system was, the less power I needed to be heard. Nowadays I run no more than 100 watts, through an SGC239, and a 102" whip. From 40 meters, to 6 meters, I can talk to almost anyone I can hear. Cant really ask for more than that. Plus, your car electrical system will love you for it.

Phineas
K0KMA
 
RE: 160-6 Meter Amp for Mobile Use  
by N3IZN on March 28, 2004 Mail this to a friend!
Your not going to use the same ant for all those bands, so why use the same amp? If you must check out,
http://users.aol.com/rfelectron/1606m.htm
People either love his amps or hate them.

If you like to repeat yourself a lot don't get an amp. If you want to enjoy HF mobileing every chance you get then there is no substitute for haveing high power.

One last thing, KW mobiles are not plug & play. Mastercard operators should stick with your IC706/FT100 and hamsticks on magnet mounts.
 
160-6 Meter Amp for Mobile Use  
by N0RTU on March 28, 2004 Mail this to a friend!
While alot of these posts contain some great info, I've not read one yet that said simply...........

Put your effort into the antenna system!
50 watts into a good mobile antenna(as efficient as you can make it) beats the hell out of 500 into a dummy load any day!

Mobile antennas for hf require study, understanding, and careful planning if you are to have a good signal below 14 mhz because these antennas are so short in relation to wavelength at a given frequency. Therefore, their efficiency is relatively poor. (1 to 2% efficiency is not uncommon in mobile hf antennas at 80 meters!)
Dealing effectively with these inefficiencies IS THE KEY to a good moble HF signal.
The answer to your problem will not be found in your checkbook, but rather in a book of another kind.........
Those you can find at most libraries!

Ham Radio SHOULD BE as much learning as operating!

my $.02

73
Mike
N0RTU
 
RE: 160-6 Meter Amp for Mobile Use  
by WIRELESS on March 28, 2004 Mail this to a friend!
There is an aspect of portable and mobile operating that is seldom discussed. I call it portabile. This is an activity where a low or high power mobile station is installed in a vehicle that has the usual mobile antenna, but operation with a separate off vehicle antenna using a quick assemble 15 or 20 foot telescoping mount with a portable antenna is made possible.

I have used systems like this for years. Sitting in or next to a shaded van in a park during the summer with a small beam at 15 ft. drinking beer, it doesn't get better than that.
 
RE: 160-6 Meter Amp for Mobile Use  
by N4GRN on March 31, 2004 Mail this to a friend!
I have a home in Nova Scotia and several hams there had the Skywalker mobile amp (RF Electronics). I tried one and it works great. I have one in my car there and am very pleased.

It is not type accepted here in US but you can purchase the components and assemble your self from RF Electronics.

I have tested mine and there are no harmonic issues and I receive nothing but great reports and have never been accused of being too wide or anything seems to be just fine. I am using the HiQ antenna and it works very well at 1350W.

I seldom use the amp but if I am camping etc and chasing DX in those big pileups it makes a big difference. There is no RFI issue with auto and secondary battery system runs DX chasing for several hours without starting the auto.

However there is a lot more to running this power than 100W. Many factors have to be considered and the complete antenna system and feed lines are an important part as is the height of the feed point etc. Lots of research but it is fun and can be done.

Good luck.
 
RE: 160-6 Meter Amp for Mobile Use  
by K4KAL on June 10, 2004 Mail this to a friend!
I have run the Worth More Amplifer with Great Success. His Website is: http://www.worth-more.com/
I was so happy with my installation, and concerned for future availability, that I purchased a spare.

Keith, K4KAL
 
RE: 160-6 Meter Amp for Mobile Use  
by WB5OAU on June 15, 2004 Mail this to a friend!
"Bigger-better-faster-more, humvee mentality, I guess"

Amp-envy and vehicle-envy, I guess?

It's funny to note the responses...typically "I don't need/want it, so why should you?"

Given that this is a hobby and a free country "Because
I want to" is a perfectly valid reason.

Enjoy the challenge of a new exploit in this great hobby, and ignore the peanut gallery.

73 John K5MO
 
RE: 160-6 Meter Amp for Mobile Use  
by N4GRN on June 16, 2004 Mail this to a friend!
K5MO;

I have logged 165 countries mobile in approx 12 mo. I have approximately 80 confirmed. I have contested while mobile.

It's not "hummer" mentality etc. It's simply the ability to break thru pileups on some "rare ones" and to be able to carry on a QSO when conditions are poor. Its part of the hobby! It's the same thing I do at the home QTH.

There are weeks at times when the amp is never used. Its just nice to have that extra punch when the conditions call for it.

73 N4GRN
 
RE: 160-6 Meter Amp for Mobile Use  
by KD4E on July 3, 2004 Mail this to a friend!
I visited his site but until the FCC changes the regs I cannot buy his amps.

I often see reference to "CB" amps as functional 40-10M or 40-6M -- do you know if other "CB" amps like the Texas Star 1600 will operate on 160 or 80?

I am thinking of acquiring one or more and adding my own bandpass filters.

I have no idea why Texas Star can sell theirs to American buyers (none of whom may operate them legally) and WorthMore cannot given that the WorthMore is obviously better engineered. Sigh.

WDYT? 73, doc kd4e
 
160-6 Meter Amp for Mobile Use  
by WA2JJH on December 4, 2004 Mail this to a friend!
1kw MOBILE? Better have a heavy duty alternator to charge an extra car batt.
 
RE: 160-6 Meter Amp for Mobile Use  
by KB4POA on December 8, 2004 Mail this to a friend!
Hey, keep me posted, I would like to know how your project progress. Best of luck, looks like a real good learning project.
 
RE: 160-6 Meter Amp for Mobile Use  
by KF4VCJ on January 28, 2005 Mail this to a friend!
put 2 kw into a steel whip then well have some fun. put out the power
 
RE: 160-6 Meter Amp for Mobile Use  
by KF4VCJ on January 28, 2005 Mail this to a friend!
you must (pardon me ) have more money than common sense
 
RE: 160-6 Meter Amp for Mobile Use  
by AD5TD on September 24, 2005 Mail this to a friend!
"RE: 160-6 Meter Amp for Mobile Use Reply
by KF4VCJ on January 28, 2005 Mail this to a friend!
you must (pardon me ) have more money than common sense"

"Why do you climb the mountain?"

"Because it's there"

I find the biggest mobile problem I have is powerline noise. I still want an amp anyway....
 
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