[Milsurplus] BC-611 F Data Needed

[Mark K3MSB]

Received a number of private emails, but I'll just post answers to the more
common questions.

The one radio is marked 611F and looks to be an F model based upon the
parts layout.    The other is marked 611 and is missing R26.  However,
based upon the repair manual,  the rest of the chassis much more closely
resembles an F chassis.

IF Transform resistances (using Simpson 260):

BC-611F:
T1 Pri:  10 ohms.   T1 Sec:  10 ohms.
T2 Pri:    9 ohms    T2 Sec:  9.5 ohms.

BC-611::
T1 Pri:  10 ohms.   T1 Sec:  10 ohms.
T2 Pri:  32 ohms    T2 Sec:  18 ohms.

I'll post some pictures of the bases and chassis as the case marking are
very different for the two units.

73 & Mucho thanks for all the help!

Mark K3MSB





On Mon, Apr 20, 2020 at 8:36 PM Mark K3MSB <mark.k3msb at gmail.com> wrote:

> Good Evening All --
>
> Since I'm working at home I had to move my software development gear from
> my office into the shack, making things a bit tight.    I put off
> continuing work on the TBW-HF until some room frees up.
>
> In the interim (after fixing my friends HW-16/HG-10B) I decided to look at
> my pair of BC-611F radios.  Both radios look great on the inside (anti
> fungus coating is a wonderful thing.....) and outside.   I had a minor PTT
> switch issue on one, but I think that's fixed.     Prior to power it up I
> wanted to do some basic resistance checks but discovered there is no
> resistance table in the manual TM11-235.   Might anyone have one?
>
> Comparing the two "innards" I quickly discovered one of the boards had
> some missing components:   C27, R26,C13, and R1.   Since C27 connects V4
> and V5 I'm a bit worried.   However, looking at the board,  it looks as if
> these components were never there in the first place.  There is no evidence
> that they were removed.
>
> I'm sure there were changes to the 611-F through it's lifetime.   I have
> TM11-235 May 1945.   I wonder if any of you have a different version out
> there and could send me the schematics page (which is figure 55 in my
> manual -- the one from BAMA).?
>
> Even the board that has all the parts is giving me some strange resistance
> readings.
>
> 73 Mark K3MSB
>
>
>
>
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