[ARC5] BFO Woes, How do I fix

[mac]

Jerry,

Grounding the CW osc. shut-off line turns the BFO OFF, not ON.  This  
line was originally connected to pin 5 on the front connector and pin  
4 on the rear socket. Don't know  off the top of my head what color  
the wire might have been but for a first step leave the two stray  
wires you mentioned floating and then check to see if you have B+ at  
the plate of the BFO tube (pin 6 on V7).  If so, check with a scope,  
if you have one, to see if you have any RF on pin 6 and, if so, try  
adjusting the BFO coil to get a beat .

Good luck,

Dennis D. W7QHO
Glendale, CA



On Jan 28, 2010, at 10:26 PM, Jerry Felts wrote:

> I had a big thrill tonite, I've been fighting a BC-454 for the last
> couple of weeks off and on. I admit I butchered the wiring. I put a
> octal socket in and my troubles started. Tonite after letting it sit
> for a day or two I went back to it. I finally figured out the wiring,
> got the filiments to light up, then got the  B+ correct. The orginal
> audio transformer is gone so put a small audio xmfr in and got it
> wired to the jack on front. So now I have audio, the AF Gain controls
> works, audio comes out of the headphones but no BFO. The jack and box
> that use to be in the front end are long gone. You were suppose to
> ground a wire that was pin 5 from the plug that use to be on the end,
> but that plug is also long gone. There is a BFO coil called Z4 and
> near as I can tell the diagrams show a red wire that went to pin 4 of
> the missing front J3 plug I have what looks like a orange wire just
> hanging around but grounding does notin. I'm lost can someone help me?
> What I need to do to make the BFO work??
>
> Why? Cuz I like to punish myself maybe? I want to get the BC-454
> working so I can get the ARC5 tx going so I can start on redoin my
> BC-348Q, so I can repackage a 811 amp and on and on and on.
>
> -- 
> Jerry - NR5A - South Dakota
> http://nr5asstuff.blogspot.com/
> http://nr5abeaconblog.blogspot.com/
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