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HR2510 swr issue

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Old 04-11-2012, 03:03 PM
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Default HR2510 swr issue


I just bought another HR2510 locally, I needed another hole in my head apparently, at least according to my wife.

Anyway, I hook up the radio and start checking it out. Power is fine, 10 watt dl swing to 38 watts. I hooked it up to my antenna, which I know the swr is good on. 1.2:1 and 1.3:1. That has been checked with an external meter. However when I checked the swr with the radio, it pegs the meter. So I hooked up my external and checked it again. Same as its always been. 1.2:1 and 1.3:1.

When I check the swr with the radio's meter, with the external meter in line, it shows the same as the meter. Or as close to it as the digital meter can. Unhook the external hook up the radio direct to the antenna, and it pegs the meter again.

I tried hooking up the 2510 I just bought from cottentop on this site, it reads normal. As does a few cobra 29's I checked after that. So I'm thinking it has to be the radio itself.

Any suggestions on where I should go from here?

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Old 04-11-2012, 03:40 PM
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Are you calibrating the meter first before reading the SWR scale? If you are then the meter may need to be re-calibrated internally. The service manual for the 2510 is available on CBtricks.com.
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Old 04-11-2012, 03:41 PM
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This is going to sound weird, but pull the cover off and look to see if there is a Mica insulator behind the final.
If there is not a insulator, unbolt the final, clean off the old heat-sink compound behind it.
Then re-install the final with a new insulator, and some fresh heat-sink compound....you do not need to go crazy with it, just a thin coat on both side`s of the insulator.
The next thing to check is on the bottom of the Main board, there are two small caps ( c124 and c125 on a Hr2600), They are soldered across the final at the rear of the radio, you can remove them.
Both of these have been known to cause weird SWR/Meter problems with the 2510/2600 radios.
HR 2510 RF meter problem?
This is Assuming everything else is working properly.

Another thing to note is that these radios are getting old, and caps start drying out and failing, along with the known glue problem.

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Jeff
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Old 04-11-2012, 03:58 PM
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Some other issues with these radios.

Lincoln HR2510 - defective

President HR2510 troubles!

I really like these radio,s and in the past highly recommended them, but it has gotten to the point in time now that if you get a 2510/2600/2830/Lincoln radio, you almost have to expect to do some preventive work on them.
The Last run of Lincolns that used the MRF455 as a final are the youngest of the series and are still holding up well, but the older ones are starting to show there age.
The Glue is a problem because it dry`s out and can become conductive and cause hi resistance shorts, it can eat up some of the fine traces on the CPU board were it is used to glue the voltage regulators down.
The electrolytic caps are old, and they dry out, change value or short.
The Main board was developed back in the 80`s, if you look it probably has UNIDEN 1988 silk-screened on the board.

Good radio,s just have a few known problems.

73
Jeff
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Old 04-11-2012, 04:49 PM
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Yep still got my Doc tuned lincoln!!!!!

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Old 04-11-2012, 05:25 PM
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Yeah, these are awesome radios, I know they are getting up there in age, that's why I own three of them now. And one of them is currently spending some quality time with the guru, Rogerbird.

I'll check out the final and see if it has its insulator, and check the caps on the final tonight. Thanks for the help.

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Old 09-11-2012, 10:24 PM
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Hello New Guy here . im in the wrong thread

Last edited by freezy; 09-11-2012 at 10:45 PM. Reason: wrong thread

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Old 09-11-2012, 10:48 PM
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Just a guess here is the radio maybe keying on another band other than 10m ?

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