[MRCA] looking for BC-223 oerators

[Radio Station KW1I]

Meir,

Where are the pictures ?

Dale
KW1I

----- Original Message ----- 
From: "Meir-WF2U" <wf2u at ws19ops.com>
To: "Military Radio Collectors Association" <mrca at mailman.qth.net>
Sent: Monday, April 14, 2008 10:19 PM
Subject: [MRCA] looking for BC-223 oerators


> Hi All,
>
> I started to work on my BC-223AX (a.k.a. the little brother of the 
> BC-191).
> Yesterday I did the "smoke test"  on the NOS vibrator supply, it worked
> well. Next I hooked up the transmitter to it, the MO put out a stable 
> signal
> on 80 M with close to the specified plate current - close to 60 
> milliamps.
> The combined current of the MO and PA maxes out at only 100 milliamps, no
> matter how I'm loading the PA - should be up to 160 milliamps, running it
> into the built-in dummy load.
> Using an external matching device (happens to be Russian, used to match a
> 20 W HF field transceiver whip/long wire output to a resonant 50-75 ohm
> dipole), I'm measuring 8.5W maximum out on CW.
> If anyone is actually operating a BC-223, what is the average power 
> achieved
> into a 50 ohm system?
> The power output in the manual is specified as 10 W.
> The other issue is that the modulator tubes don't turn on in the voice
> position. The tubes are OK. The manual says one possible problem is the
> "interrupter", which looks like some sort of a relay on the schematics.
> Is it some kind of threshold-operated relay? I know there is a voltage
> adjustment - should be adjusted for 8.2V. Maybe that's the problem that 
> the
> voltage is too low, and the "interrupter" is not pulling in. I'll study 
> the
> schematics in depth, but it'd be nice to get some pointers from others who
> have operational BC-223's.
> I'm going to set it up as an SCR-254(*) with a BC-312. Should make a cute
> low-power station.
>
> 73, Meir WF2U
> Landrum, SC
>
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