No receive --2980

[ThunderBolt349]

It was working fine, than the receive started to get lower . (i've been working on radio's since 1970)
Got me stumped, Sent it to a buddy of mine thats been at it longer than me and he thouht he had it fixed....didn't.....put it on the self about a year , put it on my table , hooked up everything.......
NO recieve need help {think I'm getting to dang old for this stuff}
The receive slowly got lower and lower untill with the rf gain and voulme wide open you had
to have the speaker to your ear to hear it....

 

[Lkaskel]

TB,
I repaired a 2990 a few weeks back with the exact same issue. The problem ended up being the caps. Try starting with C219 and C217.

 

[nomadradio]

Would be nice to know what the S-meter is doing. Best place to start is establish if the trouble is downstream from the volume control or upstream from it.

Not clear from the description if this is a receiver that's just gone deaf, or if it's an audio problem in a receiver with the S-meter dancing merrily about on channel chatter.

73

 

[ThunderBolt349]

Changed c219 & c217 already ..no change. smeter is working fine.shows plenty of activity.. Transmits with no problem Good audio on transmit.I have allready changed all the caps ..and the rfgain pot and the voulme pot..still no voulme. Thanks

 

[Eldorado828]

I just recently resolved a similar audio issue in a similar board. Check you have p.a. audio and inspect the speaker jack to verify proper function.

 

[Handy Andy]

When things get this old, it already sounds like the Audio PRE-AMP (the one that combines the SSB, AM Detector, FM Discriminator - output into one transistor - it uses an Electrolytic cap to help as a power supply filter...

The 2980, uses this...

Located Here...

Right by the Front panel "rainbow" Header
​

IF no one's looked at this radio in a while - it may signal it needs to be recapped.

 

[ThunderBolt349]

Good audio on PA..speaker jack is OK
I haven't changed those yet Handy Andy but i will EL pronto Thanks
Eldorado828 and Handy Andy

Be back to let every know Thanks agian

 

[ThunderBolt349]

I changed C45 and still WEEK receive. External speaker and internal speaker has same
amount of volume .
Hold about one foot from your ear and you can hear em
talking on the supperbowel channel .pretty clear just not loud. One of those talkers lives about 65 miles from me on the Fla. and Ga line

 

[ThunderBolt349]

Now if I turn the RF gain up all the way all I hear is static no talking still low voulme though. Keep rf gain on 7, I can hear em talking on Ch 6. (still low voulme )

 

[Handy Andy]

Ok, thats a different issue...

PA works - good sign...

Celebrating Xmas over so gotta' go will get back with this soon!

 

[ThunderBolt349]

thanks Handy Andy I hope you have a happy and a merry Christmas....God Bless you an yours

 

[nomadradio]

Well, my idiot light just came on.

Does the squelch knob have any effect when twisted from end-to-end?

If not, the squelch circuit would bear scrutiny.

And if the squelch appears to do a snappy job of shutting down your weak audio, maybe not so much.

73

 

[ThunderBolt349]

Thanks for the help , but I got sidetracked for second and droped the solder
on the printed side of the board ........oh well ..everything stoped . putting it back on the shelf untill another day. squelch WAS working fine .