Grant PC-409AC (made 1980) help please
- cb4ever104
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Re: Grant PC-409AC (made 1980) help please
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
- dt307
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Re: Grant PC-409AC (made 1980) help please
the green caps Polyester Capacitor polly filmGT390 wrote: ↑08 Apr 2019, 20:51 I got some 945`s with the correct pin out and 733`s and replaced all TR21 to TR27 and saw some improvement and much less "white noise" on transmit but audio was still low and slightly distorted, I replaced the 458 (TR43) beside the audio chip with a 945 and swapped out C46 from a parts rig (links TR43 to TR21), swapping C46 made an improvement on the audio level to a receiver but it is still slightly distorted, I aligned the PLL section and TX this made another slight improvement but receive now is off frequency a bit ?? I will align that once I get my AF genny sorted.
So I still have the problem albeit much better than it was, I think I will replace the other green caps in the audio path as changing C46 did make a fair difference, what type of caps are they ? green dipped rectangle shaped are they poly, ceramic or tants ?
163dt307-chris
“I fear the day that technology will surpass our human interaction. The world will have a generation of idiots.”
― Albert Einstein
“I fear the day that technology will surpass our human interaction. The world will have a generation of idiots.”
― Albert Einstein
- Otter
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Re: Grant PC-409AC (made 1980) help please
They're polypropylene caps, but I have never heard of one going wrong. Ever. Since 1980. Not a single one.
"To this day the words Stirling bridge conjour pride in every Scotsman's heart, while to an Englishman those same words conjour literally no feelings at all." - Cunk on Britain S1 E1
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Re: Grant PC-409AC (made 1980) help please
I thought too that they were pretty bulletproof and the one I replaced c46 tests OK as far as I can test it. It's got me wondering now why it made a fair difference changing it. I have ordered up some new poly films anyway.
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Re: Grant PC-409AC (made 1980) help please
Chris can you PM your paypal email and I will send you a thank-you
Thank-you to all who helped get to the bottom of this, the fault was electrolytic C191 right at the band selector switch....installed wrong polarity..duh
All working fine now, thinking back I must have only made contacts on FM after installing the new caps and FM is on a separate board on this early set
thanks again
Robert
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Re: Grant PC-409AC (made 1980) help please
help my -pc-409ac has had xtra chans 26mhz plus 5kc shift and 27mhz has bean added but the clarifier shists all the time how do i lock it to 12 o clock and wind the power down to 4 wts so it can have a 100wts amp on it. and i want to add fm to it as well.
pls any help would be good
73's lwc407 nz
pls any help would be good
73's lwc407 nz
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Re: Grant PC-409AC (made 1980) help please
Best advice would be to send it to Nick, Black Spirit.
You can contact him via the forum.
You can contact him via the forum.
- cb4ever104
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Re: Grant PC-409AC (made 1980) help please
The guy's callsign is "nz" , so I figure he's in New Zealand . If he is then Nick might not be his best option .
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.