[Milsurplus] May 27 re BC-222, 322, 611

[Hue Miller]

> Date: Wed, 27 May 2009 16:29:13 +0200
> From: Sandra Soldat <soldat.predrag at bih.net.ba>
> Subject: [Milsurplus] BC222/322 ,BC611
> To: milsurplus at mailman.qth.net
> Message-ID: <99CF798C0D804CB3B8FCF383CE589368 at ivicabosnjak>
> Content-Type: text/plain; charset=iso-8859-1
>
> I am Pedja , E74FR , from Sarajevo , BiH and i like to know does
anybodu can help me in two matters.
> First, i wana know more details about  BC 222 or 322. I was found
wiring diagram on Military equipment list site but there is no much
informations about these transceivers.I like to know about crystal
connection detail. As i have been seen crystal is connected to an
antenna but not on the same one as transmitter / receiver use. Some
explanation about this and coil and A.F. transformer data will be very
usefull to me.
> Second, i am about to start build a BC611 walkie-talkie replica.
Source of this wiring diagram is the same , but this is very unridable
scaned copy, so i am not able to recognise
> some components value. So i also need some better diagram of this
transceiver, or maybe more informations.
> I made those small tube only transceivers for my soul only, and i
think that i am the only one in BiH wich do so
>
> Best regards for anyone who read this !
> Pedja, E74FR

Pedja, I think I have a BC-222 here, maybe in the next month I can look
at the
wiring and see exactly how the "crystal's antenna" is built. I think it
is just the
crystal with one side ground to chassis, the other side to a short piece
of wire
for pickup. As I understand it, the crystal absorbs energy from the
receiver
at odd multiples of the crystal frequency, 3f, 5f, 7f, etc. which quiets
the
superegen receiver "rush" or "shhhhh"  noise.  The same idea was used
in the Navy TBY walkie-talkie.
If you build a replica BC-611 you should use FETs, not tubes. Too
difficult
with tubes!
BTW, I saw a circuit on a Japanese ham's website that showed a one
tube transceiver, with usual single tube used as transmitter and
receiver,
that switched in an overtone crystal when on transmit. I thought that
was
a practical idea for using such radios as BC-222/ 322 today with other
radios including modern gear. Without the crystal, these sets drift too
much
on transmit to be copied very well with any superhet, non-superregen
receiver. - Hue Miller K7HUE