Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
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

   Home   Help Search  
Pages: [1] 2 Next   Go Down
  Print  
Author Topic: Power increased in the TS-480HX  (Read 12701 times)
AD4C2006
Member

Posts: 20




Ignore
« on: January 18, 2007, 04:49:44 PM »

For all those who hasn't find the service manual of the Kenwood TS-480HX or for the ones who having it still doesn't know how to increase the output power in this radio,sometimes convenient when used as mobile station,I am going to explain with details and the easiest way for everybody to understand.First of all,lets talk about the clever design of this radio.
Kenwood in the "HX" version,took the space dedicated to the automatic antenna tuner in the "SAT" version,to put a second power amplifier that is a replica of the one at the 100W version,then both amp power is add using a toroide spliter at the output,these two amp boards use as final transistors the 2SC2732  rated each one for 80 wts output,so.,having 4 of them on these two boards the radio will be capable of making 320 wts PEP but I don't sugest to run them at maximum power,instead a "safe" level of power will be around 260W so each transistor will be running  65W.
Knowing this important factor about the circuit design lets do the job.
First thing you have to build is what Kenwood call an "adjustment  jig" which is basically  the six pins DATA plug that came in the box with the radio,you will have to solder a small piece of wire from pin 3 to pin 6 of that plug,put the metal and plastic covers back and make it ready to be pluged at the rear of the radio in the accesory conector  labeled "DATA".
Now do the following procedure to get the adjustment menu:
1- Insert the assembled plug into DATA conector located on the transceiver  front panel
2-Now turn the radio on  while pressing the MIC and the NR keys to enter the adjustment mode and then you will see inmediately the Menu # 00 in a small window left to the freq display that normally is used to show the memory channel.
3-Remove the DATA plug from the transceiver when the Menu number window appears.
4-Now moving the MULTI  knob clockwise slowly find the Menu # 24,you will see in that menu numbers between 164 and 166 which are the factory default to set the 200W.To increase the power use the small arrows that normally you use to move bands up or down and reach the number 175 and check the power output using a wattmeter and a 50 ohms dummy load,maybe the final number for you might be different than the one obtained in my radio,also it will depend on how much power you want to have.In our case the radio was giving out 260W key down(CW) and around 250W on voice peaks.
5-Now to writte the new seting to the EEPROM go to menu # 76 using the same MULTI knob.You will read EEPROM on the display.
6-Now move the up arrow,the one used to move bands,and inmediately the display will show "good" meaning the data was entered to the EEPROM.
7-To exit the adjustment mode,just click on the MTR key and the job is been done.


Warning

Do this totally at your own risk.Don't get more than 260W on CW because if you antenna system is more than 1.5 swr you might damage your final amp and void the factory warranty.Be sure you have a safe antenna for this high power.

An advice for those who has motorized antennas like the “Sierra” or the “Tarheel” when you tune them up don’t do it with this new high power,just set the “PF” key on the front panel to have less than 50W when push it,its easy to do it,its explained at the operator manual.

For those who want to "tailor" the RX and TX audio acording to your personal taste,for example to have more lows (ESSB) you can access menu # 69 and #70 that are the carrier point of USB and LSB respectively using the same procedure detailed before and writting the new data to the EEPROM.The best way to do this is using an external receiver or transceiver with an IF bandwith bigger than 3 Khz as monitor.

I wish you all good luck and best of DX’s

Hector
AD4C

Logged
K0BG
Member

Posts: 9879


WWW

Ignore
« Reply #1 on: January 18, 2007, 06:05:55 PM »

The issue with this, any of the other of the power mods is simply this. No thought what so ever is put into the necessary overhead the finals must have to assure linearity, to handle other than flat SWR, and any of a dozen other parameters necessary to assure the radio meets FCC purity specs.

Adjusting bias and/or drive to achieve the power increase, does nothing more than to increase IMD to the point that the resulting distortion can be clearly heard over the air. Doing so, is a selfish act which exemplifies a lack of good engineering knowledge, and in most cases, down right stupidity.

Alan, KØBG
www.k0bg.com
Logged

W3LK
Member

Posts: 5639




Ignore
« Reply #2 on: January 18, 2007, 07:11:30 PM »

You risk destroying the performance of this good radio just to increase the PO from 200 to 260w - an increase that will never be measurable on the receiving end?

God deliver us from such butchers.

73,

Lon - W3LK
Baltimore, Maryland
Logged

A smoking section in a restaurant makes as much sense as a peeing section in a swimming pool.
K8AC
Member

Posts: 1477




Ignore
« Reply #3 on: January 19, 2007, 07:06:54 AM »

Being intimately familiar with the entire TS-480 alignment procedure, I'm afraid I have to classify this as "golden screwdriver" activity.

It's very common for the TS-480 output on SSB to be very low (from the factory) while the CW and RTTY outputs are to spec.  And, yes, this is true when observed with a proper peak-reading wattmeter.  The entire alignment procedure starts with setting the ALC reference voltage to the specified value.  The menu values relating to power output depend upon having the correct ALC reference voltage to begin with.  Also, the final bias should be checked and this requires a special set of cables.  Furthermore, the alignment procedure expects the steps to be completed in a sequential manner.  

I would also like to point out that menu item 24 is used to check on the Drive output level WHILE WATCHING A SPECTRUM ANALYZER.  Do you suppose that arbitrarily cranking up the value might result in undesirable distortion products?

While I think highly of my TS-480SAT, buying one used is a terrible idea as you have no idea whether a previous owner has "tweaked" power output menu items based on something he read in one of these forums.
Logged
WA0ZZG
Member

Posts: 158




Ignore
« Reply #4 on: January 19, 2007, 09:57:49 AM »

WOW!!!!!
Now while I have never had this model of radio on my bench, I have had other 'small' HF-SSB radios on it.  To make a radio this small requires that some things get left out.  The easiest is PA filtering and linearizing.  A power meter never provies the total story of what is going on. A spectrum analyzer is needed.  Most 'small' radios put out a lot of 'grass' when set up to specs, worse if overdriven.  Most of the extra power is actually in the garbage.  I find that dropping the output by 10-15% really cleans things up and lightens the load on the internal cooling system.  I suspect one could drop the power in half before anyone would actually notice much difference.  This would mean that one would have to double the power to have a noticable diference the other way.
Dave
WA0ZZG
Logged
KB3MMX
Member

Posts: 132




Ignore
« Reply #5 on: January 30, 2007, 05:36:35 PM »


  Wow!!

 Is there anything positive on Eham forums??

 
 Let me say "Thank you" for providing the info to anyone interested in checking out their "service menu".
    There is always the chance that someone will mess with the settings and goof up the radio, that is YOUR chance however.

  You don't need a service menu to be able to goof a rig up!!!

 
  I fully support FREEDOM of information!!
 

  Use it at YOUR own risk, right?






 THANKS for posting the information.




Logged
K8AC
Member

Posts: 1477




Ignore
« Reply #6 on: January 31, 2007, 07:27:11 AM »

Sorry, but can't agree with your comments.  What typically happens is that someone who has no idea what they're doing reads this type of post and mucks around in the service menu.  When the rig is sold to the next guy, he usually has no more techincal skill than the previous owner and has no idea that the service menu even exists.  He would have no idea that the previous owner had "tweaked" the power settings.  Along with "freedom of information" comes a responsibility to not suggest something that can and will do harm to the equipment and the next buyer's pocketbook.  I hope that you're not one of the guys who gets screwed over by someone else celebrating "freedom of information" and indiscrimantly jacking up their output power.  
Logged
W3LK
Member

Posts: 5639




Ignore
« Reply #7 on: January 31, 2007, 11:58:11 AM »

K8AC:

A M E N !!!!

This is exactly the reason I never buy used equipment from anyone but the original owner, and then only if I know that person personally.

Lon W3LK
Baltimore, Maryland
Logged

A smoking section in a restaurant makes as much sense as a peeing section in a swimming pool.
WA9SVD
Member

Posts: 2198




Ignore
« Reply #8 on: February 01, 2007, 01:32:51 PM »

I agree with Lon, et al.
    Mucking around and risking damage to the finals and transmitting a poor signal for an extra 60 Watts?  Other than foolhardy "bragging rights" of "my radio puts out more power than yours" what possible reason is there?  
    That difference in power would ONLY be recognized on a Watt meter connected to the radio itself, not to any other station receiving the signal.
Logged
KB3MMX
Member

Posts: 132




Ignore
« Reply #9 on: February 02, 2007, 11:47:48 AM »

Oh, don't worry guys....

 According to the negative responses, Hector has told me he would probably never post here again. I was also informed he might want to remove the information from this negative forum.

 Carry on and keep up knocking people down when they present things like this.  No wonder I talk with so many that have a "Dim" view of the Eham forums.

 Also, with the way the USA is going, there will be no such thing as freedom of information before long.
 Yea for Socialism!!  Sad Sad


Logged
K8AC
Member

Posts: 1477




Ignore
« Reply #10 on: February 02, 2007, 02:29:04 PM »

One final word,David.  Some people come to these forums looking for technical advice from people with more experience in the hobby than they have.  Others, including myself, sometimes ask questions knowing that others with an engineering level of knowledge will respond with a technically sound answer.  There are many times when disagreements occur and that often leads to a discussion where bogus information is properly debunked.  

In this particular case, if the originator disagreed with the negative comments he received, he was perfectly free to defend his information with a reasoned technical response.  For example, he could have explained how he verified that the action had no negative affect on the level of spurious radiation and how he conducted a long term test verifying that the life of the finals was not affected by this action.  

While you may have interpreted the comments as negative, I've read many other comments over a long period by the others who responded and I believe their responses were positive and sincere.  It's everyone's responsibility to keep the information in these forums as accurate as possible so that new hams like yourself don't fall victim to the types of myths that pervade the world of CB radio.  Some us still believe that there is a technical basis for our hobby and will continue to speak out when necessary.  

Logged
W6MAT
Member

Posts: 1




Ignore
« Reply #11 on: May 20, 2007, 04:01:03 AM »

I did this power mod for incressed SSB peaks. I used an IFR to Check within Kewoods specs. The orginal value was 177 now it is 188. The problem I have is the RF Power meter on the display won't go above 100 Watts after performing this mod. Can anyone help?
Logged
K8AC
Member

Posts: 1477




Ignore
« Reply #12 on: May 20, 2007, 04:55:02 PM »

"I did this power mod for incressed SSB peaks. I used an IFR to Check within Kewoods specs. The orginal value was 177 now it is 188. The problem I have is the RF Power meter on the display won't go above 100 Watts after performing this mod. Can anyone help?"

Sure.  Go back and do an entire adjustment of the 480 transmit section starting at the beginning, including the setting of the ALC reference voltage.  The "values" set in the various menu items will be different for any two properly adjusted 480s, so comparing values with other 480s is of no value.  The adjustments should be done in the sequence shown in the service manual.  Jumping into the middle of the sequence and changing something will almost certainly result in screwing up adjustments in later steps. You are talking about an HX model, aren't you?  
Logged
VK4KX
Member

Posts: 12




Ignore
« Reply #13 on: October 22, 2013, 07:11:25 PM »

Interesting comments on the Power increase for a TS-480HX.
I stumbled across this while looking for info on increasing the power on the 6m side of the radio from the 100w having heard rumors that the HF side was a bit low and can be tweaked a bit, but I wouldn't play with it as I don't have the appropriate equipment to test the radio after the adjustments and a mere SWR / Power meter isn't sufficient.

So dose anyone know if the 6m side of the radio can be tweaked at all? or the finals limited to 100w and that's it, I'm hoping we will get a 6m power increase in the near future.

Thanks.
de VK4KX, Bernie
Logged
KA5IPF
Member

Posts: 1012


WWW

Ignore
« Reply #14 on: October 23, 2013, 08:35:32 AM »

Oh, don't worry guys....

 According to the negative responses, Hector has told me he would probably never post here again. I was also informed he might want to remove the information from this negative forum.

 Carry on and keep up knocking people down when they present things like this.  No wonder I talk with so many that have a "Dim" view of the Eham forums.

 Also, with the way the USA is going, there will be no such thing as freedom of information before long.
 Yea for Socialism!!  Sad Sad




With information comes the responsibility to use it correctly and the knowledge to apply it being fully aware of possible side effects.

If he had presented the information with engineering notes on the effects of the increased power in regards to signal purity, heat dissipation, and power requirements it would have been better received.

But to randomly increase the power out without regards to engineering practices already applied is folly.

Clif
Logged
Pages: [1] 2 Next   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!