eHam.net - Amateur Radio (Ham Radio) Community

Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Speak Out
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net


QSL Managers
     

Ham Links
     



[Articles Home]  [Add Article]  

Hi Performance Ham Radio

Vernon J. Kunes, Jr. (N2YZS) on January 3, 2003
View comments about this article!


To first start this article, a little background on myself is probably in order. I am a General Class ham, who started in the hobby later in life (I was first licensed in 1994 at the age of 47). I didn't know a lot about radios then, so my first HF rig was one I bought because I could afford it and I knew the brand name. I bought a vertical antenna, and, voila, I was a ham operator. But something was missing.

I live in a valley so signals are a little harder to come by because of the location. Not many signals, and a lot of noise. Thus began my quest. Knowledge is a powerful tool, so I started reading and talking to hams who had been in the hobby a lot longer than I had. From this reading and these discussions came my implementation of "Hi Performance Ham Radio".

First, and most important, is antennas. The best you can afford is the only way to go. This does not always mean the most expensive. There are many hi performance wire antennas that can be built for little money. My personal favorite is a sky loop (a horizontal loop somewhat close to the ground). I have an 80 meter loop up a little less than 20 feet that shows some very good performance, especially on the higher frequency bands. This antenna has a lot of gain on 10 and 20 meters, and somewhat lower take off angles than at 80 meters. Being horizontal, it seems to be a quieter antenna than others. What is really nice is the gain on 10 and 20 meters. Remember, antenna gain works both on receive and transmit! Although I could probably feed it with a good low loss coax, I fed it with 450 ohm ladder line, and installed a W9INN balun just before my tuner. I also use a 3 element Yagi up about 40'. The yagi has quite a bit of gain, front to back signal rejection, as well as front to side rejection. Hopefully, this coming year, I will upgrade this to an even better type of beam.

Next is feedline. The best low loss coax is definitely more expensive than the run of the mill coaxes, but worth it in the long run. LMR 400, 9913, and some of the Super 8 coaxes are very low loss, and come with jackets that resist UV and can be direct buried, if you like.

Next is the antenna tuner (if you use one, and you probably will with any hi performance wire antenna). If you use ladder line exclusively, then a good old Johnson Matchbox is really hard to beat. The balanced, balanced antenna tuner described in ARRL publications, is also very good. For coax, the only choice, in my opinion, is an "L" type tuner. They are more efficient than other types, and only tune in one place, which is the most efficient. There are a couple of commercial products that will do the job nicely.

The last, is the radio itself. General coverage receivers are out. The extra noise that comes in with the signals you want is hard to deal with. A "Ham Band"; only transceiver, with good specs, band preselectors, lots of crystal filtering options, notch, and Pass Band filtering will go a long way pulling in the weak ones. Crystal filters are great for adjacent strong signal rejection.

If you have gone this far, you will probably find a lot of band noise (especially if your receiver has a lot of gain in the IF). This was my last investment. An aftermarket DSP filter will go a long way as far as eliminating band noise, so that you can still hear that signal that might not even hardly deflect the "S" meter.

After following this road, I am hearing more and weaker signals with the greatest of ease. My equipment does not match, but I can see no performance advantage in matching equipment. My equipment is older, but is of excellent quality. And I can hear and work the weak ones! This is my idea of Hi Performance Ham Radio.

Member Comments:
This article has expired. No more comments may be added.
 
Hi Performance Ham Radio  
by K9PO on January 3, 2003 Mail this to a friend!
Maybe I am slow but could you explain the pun you are going for with 'Hi Performance Ham Radio' or is it a typo and you really meant 'High Performance Ham Radio'

73
Scott
 
RE: Hi Performance Ham Radio  
by K2WH on January 3, 2003 Mail this to a friend!
I think I gather from your posting, that you are advocating or using coax with a wire loop with the intention of using it on multiple bands. Well, using coax in this fashion will really put a dent in the "Hi Performance" part of you msg.

Never, never use coax with any wire antenna intended for multiple band use. Ladder line is the only way to go to minimize losses in the feeder. For single band operation coax may be the way to go. But, because of the weight of the coax I still say go with ladder line.

K2WH


 
RE: Hi Performance Ham Radio  
by K2WH on January 3, 2003 Mail this to a friend!
Sorry, I goofed. You are using ladder line. Never mind!

K2WH
 
Hi Performance Ham Radio  
by WB2WIK on January 3, 2003 Mail this to a friend!
Good work, Vernon!

As you have found, there's no particular problem with a "valley" location for HF work, unless you're so deeply in a valley that the surrounding mountains make it impossible to work anything below 25 degrees or so -- and that takes quite a deep valley, with quite tall hills close by.

I'd rather have a great antenna farm in a valley than junky antennas on a mountaintop, any day.

I wish you would have included a couple of photographs of exactly what you did end up using -- maybe next time?

Steve, WB2WIK/6
 
Hi Performance Ham Radio  
by W9JCM on January 3, 2003 Mail this to a friend!
HI Performace Ham Radio in my opinion doesnt include using a antenna tuner. It includes resonant antennas on each band. And maybe a the use of a built in tuner just to touch it up a little for say psk use.
 
Hi Performance Ham Radio  
by KG4USI on January 3, 2003 Mail this to a friend!
Nice article.

Thanks for posting it.

73s

KG4USI
 
RE: Hi Performance Ham Radio  
by NB6Z on January 3, 2003 Mail this to a friend!
It sounds like you have solved some problems you were having due to your location, and you should feel good about that accomplishment. Ham radio needs to be much more than just talking on the radio... I have worked many hams on the digital modes that do not even have the option for an outdoor antenna system. They do the best they can with what they got for indoor antenna wires, but they are able to operate and enjoy the hobby mainly because they have switched to a High Perfomance Ham Radio Mode. Technically, CW is still the best performer, but in that arena you must compete with high power stations using high performance antennas. So the digital modes (like PSK31 and MFSK16) offer a unique solution because most operation (99%) is under 100 watts and some very low performance antennas are often used.
A couple comments about your observations:
Your loop antenna low to the ground is a good idea for your "valley" location, but it does not have gain. What it has is directivity on the higher bands, so you might think about those signals you are missing with a single fixed antenna. ( Maybe another antenna project for this Summer ;-)
The narrow IF filters actually reduce the receive signal as compared to the wider filters, but often this compromise is the only way you can select a weak signal when stronger signals are pumping your AGC voltage. If you have the approriate radio (mine is a FT-920), there is a "Hi Performance" technique I regularly use for digi and CW operation that will utilize the dynamic range of the receiver to find weak signals. You select the appropriate type RF pre-amp and then dial in between 6-12 dB of front-end attenuation. You turn OFF the reciever AGC and you can now hunt for weak signals in the presence of moderately strong signals. (This really works well if you have a spectrum display running on your PC.) You can then switch on a narrow IF filter to remove the clutter.

CU, Griff.
 
Hi Performance Ham Radio  
by KG4VGH on January 3, 2003 Mail this to a friend!
Hi...first off excellent article !!!!

Second...."For coax, the only choice, in my opinion, is an "L" type tuner. They are more efficient than other types, and only tune in one place, which is the most efficient. There are a couple of commercial products that will do the job nicely. "

What are you referring to when you speak of an L Tuner ?

I also am in my infancy with Ham Radio and appreciate any and ALL suggestions....
Thanks
Pete
KG4VGH
 
Which Radio???  
by VE2XLT on January 3, 2003 Mail this to a friend!
By The Radio -I was supposed to learn about your Rig ....Ham-bands only sounds a good idea! My old
NCG10/160 from Panasonic outperforms IC735 as RX:-)
 
RE: Hi Performance Ham Radio  
by K4NR on January 3, 2003 Mail this to a friend!
There are very few L tuners made today. The Tentec series are very good tuners. Very little loss on the low bands. I think the first in the line was the 228, then the 229 series, and then the 238 series. The only real changes they made over the years was to change the packaging to match their rigs and upgrade the internal balun. I have a 229B that works great!


There is a good review of popular tuners in the next issue of QST.

73 de Tom, K4NR
 
RE: Hi Performance Ham Radio  
by K4NR on January 3, 2003 Mail this to a friend!
Correction--the 229 was the first in the series. The 228 was a 200 watt tuner. see http://www.qsl.net/tentec

73 de Tom
 
RE: Hi Performance Ham Radio  
by NOMIC on January 3, 2003 Mail this to a friend!
I guess I am missing the point of this article. Isn't everything you pointed out here very obvious to any ham with some basic experience?

NOMIC
 
RE: Hi Performance Ham Radio  
by KE1MB on January 3, 2003 Mail this to a friend!
Nice to see someone working with what they have. Being in a valley is just as challenging as being in a rental apt. located in a city. How about using greese between the joints in your vertical to reduce harmonics, or keeping the gutter pipe on the house from acting like a "director" pulling RF into the house. By using a wire ant. with a very high take off angle you make best use of what you are dealt. I would think that with more well tuned wire ants you may find a way to outpreform your beam if it cannot clear a hill top. And if weather such as snow and ice are not a problem then forget using coax and go open wire always, it's much cheaper and beats coax on the loss. Using a balanced ant. tuner, such as one with dual roller inductors, will outpreform a balun and unbalanced tuner. I use an older radio also, a Kenwood TS930SAT, and will do so because I simply do not want to spend too much for a radio and believe that with repair know how and some simple test gear you can have a great time working on and using a really nice older radio. I believe Ham Radio always "recycling" itself.
 
RE: Hi Performance Ham Radio  
by WI1S on January 3, 2003 Mail this to a friend!
I realize the conventional wisdom is to feed a multi-band wire antenna with ladder line. However... I too have an 80 meter horizontal loop that's up 30-45 feet. I feed it with RG-213 to a 1:1 balun at the feedpoint. With the internal tuner in my IC-746, the antenna works great on all bands 80 through 6 meters. In fact, I don't even need the tuner at all on the CW ends of 80, 40 or 15. (I cut it to resonate around 3.510 mHz.) Even on 6 meters the SWR is less than 2:1, so the tuner handles that easily.

I've had it up for about three months now and in that time, I've worked 129 countries as well as a Clean Sweep in the November Sweepstakes all using 100 watts. I guess I should try feeding it with ladder line and see what kind of difference that makes. Anyway, my point is, if ladder line is impractical, feeding a loop with coax definitely DOES work!
 
RE: Hi Performance Ham Radio  
by KA1EZE on January 3, 2003 Mail this to a friend!
I too use a horizontal loop. Mine is well, something like 400 feet. I unfortunately couldn't pick the length too exactly because of the trees.

In fact I used the loop because of the trees. Woods with lots of spindly trees. I fished it through there though!

Also, from what I understand, closed loops are themselves good qrn rejectors (electrical field vs magnetic rejection??).

And this is a great article to post. Not everyone does have the experience and it's good to hear these reports, especially for web surfers stumbling upon eham.net.

Part of the fun is to not believe all you read, and experiment to see if things work the way you expect.

Rick
 
RE: Hi Performance Ham Radio  
by N2YZS on January 4, 2003 Mail this to a friend!

To K9PO:
You're right. It should have been "High", not "Hi" (Hi is used in the auto performance sense, and I just used it that way, not remembering "Hi Hi" in ham radio). Sorry for the confusion.

To NB6Z:
Thanks for the suggestions. Summer is coming and I will certainly try some new projects.

To W9JCM:
You are correct. As far as using a tuner, I only use it when it is needed (I need it to tune my tribander for PSK31. My radio does not have a built in tuner. For most usage, the tuner is in the bypass mode.

To KG4VGH:
The "L" tuner is a matching network made of a series inductor and shunted capacitance (in my case, anyway).
The only drawback is that it needs alot of capacitance for the lower bands (2000-3000 pf or so). This is usally accomplished by switching in additional capacitance. The lower impedence is always connected to the series side of the network. Matches in only one place, which is optimum.

To N0MIC:
What I have done is probably old hat to experienced hams. But there are a number of newer hams that may benefit from others experience.
 
Hi Performance Ham Radio  
by KL7XL on January 6, 2003 Mail this to a friend!
Nice article, Vernon.

I also use an 80m horizontal loop, as well as a 20m vertical loop (horizontal polarization), and a 17m wire Moxon Rectangle. All are fed with 450 ohm ladder line to Johnson Matchboxes.

All are "in the trees" at 30-40 ft height.

On the bands between 10 and 20m, I can switch between the three antennas and select the one that gives the best results.

I have been told that horizontal loops are "cloud warmers" that are no good on DX. My experience has proven otherwise. My 80m loop has become my primary antenna.

I am not saying the horizontal loop is the best antenna for everyone's needs. We all have constraints - space, $$, time, etc, so we do the best we can with what we have available.

For me a lot of the fun of radio is trying different antennas. A good learning experience and wire is cheap.

A wonderful resource is www.cebik.com, and specifically http://www.cebik.com/hl.html, and http://www.cebik.com/atl1.html for info on horizontal loops.

See you on the bands.

Ron
KL7XL
 
RE: Hi Performance Ham Radio  
by N8FVJ on January 7, 2003 Mail this to a friend!
Statement: 'General Receive Transceivers are out'. You make a point. By design, the ICOM IC-730 & IC-740 are great low dollar receivers & high performance is well known using the TEN TEC OMNI series as well. The band switch allows a tighter, filtered front end with a good second order intercept point. A filter in each I.F. also helps in-band performance.
However, an antenna tuner in line on receive does make a better performer for broadband front-ends. The more modern transceivers with a built-in antenna tuner that is connected on the receive side as well as transmit will perform well. Review the receiver specifications. A second order intercept point of 55dB or better will provide good performance. A third order IMD of 95dB or better is great for in-band reception. Of course, all this is referenced to receiver sensitivity. Modern receivers are plenty sensitive enough.
 
RE: Hi Performance Ham Radio  
by G4REK on January 8, 2003 Mail this to a friend!
Yep your right there, another banal posting.
 
Noise in the valley  
by KF6IIU on January 9, 2003 Mail this to a friend!
I am not sure that doing all that will help all RFI situations. I'm glad it helped you, but all the RFI I've encountered has been RFI generated on the operating frequency itself. I would suspect that all the improvements you've made, while effective against rejecting out of band signals, have also made your system less susceptible to receving noise at and near your operating frequency.

I find it amazing how much noise there can be in rural areas. I went skiing last week in the Sierra and the place we stayed at (Rainbow Lodge nr Soda Springs) had incredible amounts of RFI. If I'd had the time to run HF I would not have been able to anyway.
 
RE: Noise in the valley  
by N8FVJ on January 10, 2003 Mail this to a friend!
If KF6IIU response is directed towards my comment, I offer the following:

The antenna tuner in-line during receive is more effective for very strong out of band signals. In-band strong signal rejection performance is indicated by a receivers Blocking Dymanic Range & 3rd Order IMD measurements. A few of the better receivers regarding in-band performance is an ICOM IC-761 or IC-765. (Disregard QST Review measurements on the '761'). The Kenwood TS-850AT is another budget performer in this regard.
 
Hi Performance Ham Radio  
by VK5CC on January 12, 2003 Mail this to a friend!
I can't believe articles like this i mean really--HIGH PERFORMANCE HAM RADIO? It starts with stacked Yagi/QUAD arrays and mono-banders on 40 and 80m or 4 squares etc.And high performance doesn't include Antenna COUPLERS and non resonant antenna's. I guess more of the usual" The blind leading the blind!!
 
Hi Performance Ham Radio...ahhh...many experts  
by N7IOF on January 14, 2003 Mail this to a friend!
Any article that will generate such a wide variety of responses is FANTASTIC.

It only proves that we come from an array of backgrounds, experiences, finances and knowledge.

My conclusion is that ham radio can be enjoyed with a 20-year-old transceiver and a long wire antenna just as much as with a new transceiver and stacked quads.

Enjoy everyone...
 
General Coverage Receivers  
by N8YV on January 29, 2004 Mail this to a friend!
"General coverage receivers are out."

This is inaccurate. More accurate would be a statement such as "Many general coverage receivers are out".

There are some state-of-the-art general coverage receivers out there, that will blow away most "ham only" receivers. Some commercial-grade general coverage receivers (Watkins-Johnson and RACAL, just to name two) are still waiting for new contenders to compete with.

DSP may soon have its place in the sun, but the technology is still in its "childhood". The fact that a DSP-equipped rig of two or three years' age is considered "inferior" to some that are being made now, is proof that DSP still has a long way to go before it replaces the best analog equipment.

Ten-Tec's latest offering is evidence of this fact, employing an impressive blend of analog and DSP component architectures. It beats even their own "all-DSP designs.



 
Hi Performance Ham Radio  
by WA2JJH on May 4, 2004 Mail this to a friend!
N8YV is right on the money about having a blend of XTAL and software defined IF's. The filter should be in the first mixer. That xtal filter will make or break the rest of the RCVR.

Yes Racals are very nice, but even used ultra expensive. All the racals I know of,do not even have passband tuning or notch. However they have an ultra silent RCVR when there is no signal.

I have a HARRIS 350K. Mil spec. built like a tank.
The IF filter is triple the physical size of your average 8 pole XTAL filter. Again when there is no signal, nothing comes up. The RCVR audio has a different sound to it. I have done a/b comparisons.
The HARRIS transceiver will have a signal out of the noise. My ham rigs, you know there is noise and a signal. However the noise wins out.
 
Email Subscription
You are not subscribed to discussions on this article.

Subscribe!
My Subscriptions
Subscriptions Help

Related News & Articles
Revisiting a .HAM Internet Domain
The Mobile Ham Installation
Safety Isn't Just a Word
ARES -- Many Questions
NTIA Study Documents Radio Interference from BPL:


Other Operating Articles
Safety First
My First Date with Olivia
D-STAR/Analog Interference Experience
Using Twitter During Mobile Operation
First HF Contact and Other Stuff