Help with a philly pc76xl

2FB327 · Apr 1, 2017

I was given this radio and have no history. It looks to be a virgin, limiter intact, wax on cans, no spread coils.
On RX, when hooked to the generator and set on channel 19, the tone is audible on 18 and weak on 17.
On TX, it has carrier and mod from channel 1 thru 17 then nothing.
What would be the next step? Chip? Is there a way I could check the chip with the frequency counter?

Robb · Apr 1, 2017

Sounds like it needs to be aligned. Probably the voltage in the PLL alignment is off and is not getting enough to lock the PLL above ch 17.

2FB327 · Apr 2, 2017

That's what's frustrating, I checked the alignment according to the manual and have the pattern on the scope on channel 19 and it changes with L22 and it's there on channel 1 and 40.
With the voltmeter on R88 I have the 3.2V and it changes with L19.

Robb · Apr 2, 2017

Guess I would test parts in/around the PLL next.
Do you have another xtal to put in and try - or tested the original - for starters?

2FB327 · Apr 3, 2017

Yes, I have some parts radio and will start there.

Search

Help with a philly pc76xl

2FB327

Active Member

Robb

Honorary Member Silent Key

2FB327

Active Member

Robb

Honorary Member Silent Key

2FB327

Active Member

Settings Notifications

Options