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HR2600 is still dropping in wattage when keyed

H

hossless

Guest
Hey all, the power on my HR2600 is still dropping, even after I sent it to Doc @ Doc's Electronics (the man I had set the radio up in the first place). Now he is supposed to be one of the best with the Lincoln line of radios, and he probably is. But he couldn't find the reason why the watts are dropping when keyed up, with or without the linear cranked. Both finals are AOK and everything else seemed to check out fine.

Does anyone have any suggestions on what might be causing my power to drop, and quickly enough for folks on the receiving end to notice also...

This has been an awsome radio, tx & rx, with the exception of the drop in watts when keying.



Thanks, Hossless


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=hossless>hossless</A> at: 11/27/03 1:35 am
 

Hey all, the power on my HR2600 is still dropping, even after I sent it to Doc @ Doc's Electronics (the man I had set the radio up in the first place). Now he is supposed to be one of the best with the Lincoln line of radios, and he probably is. But he couldn't find the reason why the watts are dropping when keyed up, with or without the linear cranked. Both finals are AOK and everything else seemed to check out fine.

Does anyone have any suggestions on what might be causing my power to drop, and quickly enough for folks on the receiving end to notice also...

This has been an awsome radio, tx & rx, with the exception of the drop in watts when keying.



Thanks, Hossless


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=hossless>hossless</A> at: 11/27/03 1:35 am
 
Hello,



What final does the radio have in it?



If it has the MRF477 or MRF497, Check to see if it has an insulator between the Final and heat sink.



If it does not, Add one!

Remeber to apply thermal grease on the insulator.



You may notice a drop of a few watts, But that is normal, You are probably getting RF feedback Ground Loop. Caused by the Final's mounting tab (which is Power Ground - Emitter) generating RF though the Chassi Ground ( Which the Heatsink is Chassi Ground)

This RF feedback is probabaly causing a Bias Problem.

By Isolating the Grounds at the Final (Installing the insulator) you are removing the RF Ground Loop.

I have seen this cause strange problems, like HiSWRs with the Covers off and the Fading Output power.



Let me know how you make out.



Roger

<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/happy.gif ALT=":D">


</p>
 
Hello,



What final does the radio have in it?



If it has the MRF477 or MRF497, Check to see if it has an insulator between the Final and heat sink.



If it does not, Add one!

Remeber to apply thermal grease on the insulator.



You may notice a drop of a few watts, But that is normal, You are probably getting RF feedback Ground Loop. Caused by the Final's mounting tab (which is Power Ground - Emitter) generating RF though the Chassi Ground ( Which the Heatsink is Chassi Ground)

This RF feedback is probabaly causing a Bias Problem.

By Isolating the Grounds at the Final (Installing the insulator) you are removing the RF Ground Loop.

I have seen this cause strange problems, like HiSWRs with the Covers off and the Fading Output power.



Let me know how you make out.



Roger

<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/happy.gif ALT=":D">


</p>
 
Hey Roger, I suggested putting an insulator between the 497 and case to Doc at Doc's Electronics, and he said that it would loose too much power, and that would not fix the problem. I have nothing to loose but a few watts, but I need to put an end to the power/watt dropping.

I'll let you know what happens - Thanks, Hossless


</p>
 
Hey Roger, I suggested putting an insulator between the 497 and case to Doc at Doc's Electronics, and he said that it would loose too much power, and that would not fix the problem. I have nothing to loose but a few watts, but I need to put an end to the power/watt dropping.

I'll let you know what happens - Thanks, Hossless


</p>
 
Hi,



Please let me know.



I have had to do this before, and it cured the problem.



As far as the drop in watts.. Think about it..

If your radio has a RF feedback problem, and it may be caused by incorrect grounding, that could also cause intermittent or high SWR's, would you trust the Watt meter reading??



I would probably attribute the 'False' higher watt reading to the bad SWRs (caused by the RF feedback) after installing the Insulator, you would stabalize the SWR's - remove the Feedback loop - and probably get 'Actual' watt readings!



I would much rather have the circuit properly balanced..

In the last radio I did like this, the Guy sent it back because of the

dropping power. I did the insulator mod, tested and returned it,

With slightly lower power than the first time.. He was pissed that the power was lower by a few watts, but it was steady, and after a few 'On-Air' checks with his neighbors, realized that the loss in power was not 'actual' on his distance signal reports.. He could still give a better signal to his contact he had 'benchmarked' with before he sent it to me.



Let me know..

Roger

<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/happy.gif ALT=":D">


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=rogerbird1>Rogerbird1</A> at: 11/29/03 9:23 pm
 
Hi,



Please let me know.



I have had to do this before, and it cured the problem.



As far as the drop in watts.. Think about it..

If your radio has a RF feedback problem, and it may be caused by incorrect grounding, that could also cause intermittent or high SWR's, would you trust the Watt meter reading??



I would probably attribute the 'False' higher watt reading to the bad SWRs (caused by the RF feedback) after installing the Insulator, you would stabalize the SWR's - remove the Feedback loop - and probably get 'Actual' watt readings!



I would much rather have the circuit properly balanced..

In the last radio I did like this, the Guy sent it back because of the

dropping power. I did the insulator mod, tested and returned it,

With slightly lower power than the first time.. He was pissed that the power was lower by a few watts, but it was steady, and after a few 'On-Air' checks with his neighbors, realized that the loss in power was not 'actual' on his distance signal reports.. He could still give a better signal to his contact he had 'benchmarked' with before he sent it to me.



Let me know..

Roger

<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/happy.gif ALT=":D">


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=rogerbird1>Rogerbird1</A> at: 11/29/03 9:23 pm
 
I have also seen this problem, and an insulator installed behind the final cured it. It has also caused other problems, like on some radios you can do the high power mod( were you modify the Pre-driver traces) and insert the 497 final, Power that radio back up and all looks good, you have a slight increase in output, radio seems to be working fine. Then you put the top cover back on and go install the rig, the radio goes wacko, SWR all screwed up, power readings all over the place, then you pull the radio back out, bench the radio , pull the cover off and test the radio and everything is OK again. So you just think you are going nuts and put it all together, hook it back up and it is all screwed up again( this is the voice of experience talking here) mess with the radio for a week, then put the insulator behind the final and like Magic....all of the problems go away. I wonder how many 2510`s over the years have driven guys nuts with this little bad habit? LOL.

Anyway, Roger is dead-right on with this, the very small decrease in output you see(if any) will not really effect the radio, it was most likely not there to begin with.... and will solve the power drop problem, and A problem that you never knew you had.



73

Jeff




CDX 339

RadioActive



20031128_1300_eit_171.gif


YAESU_150w.jpg
</p>
 
I have also seen this problem, and an insulator installed behind the final cured it. It has also caused other problems, like on some radios you can do the high power mod( were you modify the Pre-driver traces) and insert the 497 final, Power that radio back up and all looks good, you have a slight increase in output, radio seems to be working fine. Then you put the top cover back on and go install the rig, the radio goes wacko, SWR all screwed up, power readings all over the place, then you pull the radio back out, bench the radio , pull the cover off and test the radio and everything is OK again. So you just think you are going nuts and put it all together, hook it back up and it is all screwed up again( this is the voice of experience talking here) mess with the radio for a week, then put the insulator behind the final and like Magic....all of the problems go away. I wonder how many 2510`s over the years have driven guys nuts with this little bad habit? LOL.

Anyway, Roger is dead-right on with this, the very small decrease in output you see(if any) will not really effect the radio, it was most likely not there to begin with.... and will solve the power drop problem, and A problem that you never knew you had.



73

Jeff




CDX 339

RadioActive



20031128_1300_eit_171.gif


YAESU_150w.jpg
</p>
 
I just got back from my Windy run. I'll do the insulation in the next couple days and will post the results.

Thanks Guys, Hossless


</p>
 
I just got back from my Windy run. I'll do the insulation in the next couple days and will post the results.

Thanks Guys, Hossless


</p>
 

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