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Cap missing, Uniden Washington PC-385AG board.
- Thread starter morseguy
- Start date
Schematic of radio please. Where is the cap located? Which part of the circuit, transmitter, receiver, or audio?
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C85 is a .0022uf mylar cap connected between the mic input line and ground just before the mic signal enters the mic amp (TR29). It was probably removed to change the freq response to the mic amp. Leaving it out should not cause any problems. You can put it back in just to see if the xmit audio sounds any different. 73s.
- 399
Thanks for the info, the schematic I have is not that good, that's why I didn't answer the first reply. I wonder just how removing that cap changes the transmit audio? Maybe more low end?
I plan on restoring it and want to undo some of the mods done.
I think it also the clarifier mod the one that seems popular for many radios with this board. Suppose to give 1kc down, 3 kc up slide. What's the advantage? Does this also work on transmit?
Tnx.
I plan on restoring it and want to undo some of the mods done.
I think it also the clarifier mod the one that seems popular for many radios with this board. Suppose to give 1kc down, 3 kc up slide. What's the advantage? Does this also work on transmit?
Tnx.
you can check the clarifier mod with a freq counter to see if it was done right. it will track both TX and RX. I do all my SSB radios this way. some people like it and some do not. I would not talk SSB if this mod was not done. at least that is just me. just hook a freq counter to the output and rotate the clarifier keyed up to see if it tracks as you turn it up and down.
C85 is in the circuit to roll off some of the audio's high frequency content. So ... in effect it makes the audio sound more bassy. Removing it will increase the audio bandwidth. Depending on the mic you're using, it may a little brighter or even tinny. It's something you can play around with to get the sound you want from the radio.
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