Hi guys,
Second time this year I get a client with a VHF ham radio that is making a nasy audio osc in TX.
What can I say.
May god bless and keep the ESR meter.
That thing comes in so handy.
The first repair was an elderly Yeasu VHF FM/SSB radio.
Changed out a bunch of weak through hole e lytics and the noise went away.
This second unit is an Icom 2100 FM set.
Ended up pulling 17 SMT e lytics out of the thing.
Got a spread of readings from 4 ohms to about 15.
It was easy enough to change them out. Had direct subs for e 100uF e lytics.
Used Jameco P/N 1858797 for the 10uF parts.
https://www.jameco.com/webapp/wcs/st...ProductDisplay
aka 16 volt 10uF grains of sand. Tweezers, and the big maginifier in the ring lamp.
As for the caps, I buy them about 300 at a time.
Use them to fix Midland LMR tone boards.
They work great, caps and the rebuilt tone boards.
Good thing I did not load up on caffine this AM.
Most of the duds were in the main body of the radio.
Pulled the failed parts out and soldered in new ones.
That made no difference.
The thing still made an unhappy noise in tx.
Took off the nose peice.
There were five more 10uF in the nose peice.
Pulled and replaced.
That cured the issue.
One cap was so far gone it did not make the meter needle twitch so it was greater than 30 ohms ESR. All near the mic jack. Go figure.
Had it playing for about 3 hours today on the bench.
The unit seems stable and reliable now.
Not bad for a radio that was made around 1999.
Hung the repair tags on it, and just for giggles put the dud parts in a plastic bag and tie wraped that to the power cable.
Not a bad days work.
Hope this helps.
Be well there.
Radio Mike aka Jack Crow
Herndon VA
Second time this year I get a client with a VHF ham radio that is making a nasy audio osc in TX.
What can I say.
May god bless and keep the ESR meter.
That thing comes in so handy.
The first repair was an elderly Yeasu VHF FM/SSB radio.
Changed out a bunch of weak through hole e lytics and the noise went away.
This second unit is an Icom 2100 FM set.
Ended up pulling 17 SMT e lytics out of the thing.
Got a spread of readings from 4 ohms to about 15.
It was easy enough to change them out. Had direct subs for e 100uF e lytics.
Used Jameco P/N 1858797 for the 10uF parts.
https://www.jameco.com/webapp/wcs/st...ProductDisplay
aka 16 volt 10uF grains of sand. Tweezers, and the big maginifier in the ring lamp.
As for the caps, I buy them about 300 at a time.
Use them to fix Midland LMR tone boards.
They work great, caps and the rebuilt tone boards.
Good thing I did not load up on caffine this AM.
Most of the duds were in the main body of the radio.
Pulled the failed parts out and soldered in new ones.
That made no difference.
The thing still made an unhappy noise in tx.
Took off the nose peice.
There were five more 10uF in the nose peice.
Pulled and replaced.
That cured the issue.
One cap was so far gone it did not make the meter needle twitch so it was greater than 30 ohms ESR. All near the mic jack. Go figure.
Had it playing for about 3 hours today on the bench.
The unit seems stable and reliable now.
Not bad for a radio that was made around 1999.
Hung the repair tags on it, and just for giggles put the dud parts in a plastic bag and tie wraped that to the power cable.
Not a bad days work.
Hope this helps.
Be well there.
Radio Mike aka Jack Crow
Herndon VA
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