[AMRadio] BC-610-E

James M. Walker chejmw at acsu.buffalo.edu
Wed Sep 13 06:56:43 EDT 2006

A long time ago I tried the DowKey route, After
experiencing the "Zorch" phenomenon, I went to the
E.F. Johnson TR switch. Mainly for the power handling
capabilities, but also for the small amount of amplification
to the receiver, when in receive mode, the TRswitch RX
output is around 150 - 300 ohms which goes well with the
input on the HQ-129(X).

There is 115VAC available (on the E model modulator deck)
however it will require splicing into the lines. Also be careful
of the sequencing, especially with the R-390(*) receiver.


----- Original Message ----- 
From: "Rick Brashear" <rickbras at airmail.net>
To: <AMRadio at mailman.qth.net>
Sent: Tuesday, September 12, 2006 4:39 PM
Subject: [AMRadio] BC-610-E

> All you BC-610 gurus, please, put on your thinking caps.  Where is the 
> BEST place to derive 117 vac for a Dow Key relay?  My "E" model came 
> equipped with a Dow Key relay attached to the back all wired in.  
> However, it's not an ideal set up.  It seems there is always enough 
> voltage running through the coil to make the relay hum a little.  The 
> main problem is it sometimes doesn't release good and switch the antenna 
> back to the receiver due this voltage.  I haven't traced it to see 
> exactly where this connection is made, but I know there has to be a 
> better point.  Before I start digging through this heavy monster 
> (remember the "E" is NOT very friendly when it comes to repair or 
> servicing) I thought I'd get some ideas from those who have already made 
> this connection.
> Thanks,
> Rick/K5IZ
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