[ARC5] BC-229 / BC-429 receivers

[WA5CAB--- via ARC5]

The connector (when present) is mounted at the top of the front panel 
between the antenna post and the tuning dial.  It looks like a 4-pin but the top 
center one is a solid guide pin, not used electrically.

BC-229's and BC-429's up through -AO- have the loop connector.  BC-AQ-429 
(there was no BC-AQ-229) does not have it and is unpainted.  I do not have 
any paper on SCR-AP-183 (there was no SCR-AP-283) so can't quite say when the 
loop connector was dropped.  I would guess maybe at the same time that paint 
was dropped.  The SCR-AO-283 Instruction Book that I have a partial copy of 
has no photographs.  If anyone has any components marked -AO- or -AP, 
please report whether painted or not.

I wonder where the Russian receiver schematic came from?  It is drawn 
backwards to the dozen or so others that I have copies of (antenna on the right 
instead of the left).  Also, the loop connector pin number shown as "55" is 
actually "65".  "55" is used in PL-61.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 10/11/2014 07:55:03 AM Central Daylight Time, 
aaf-radio-1 at aafradio.org writes: 
> It's for the optional loop antenna.
> 
> On 10/11/2014 6:46 AM, AKLDGUY . wrote:
> >In the BC-229 and BC-429 receivers, a winding on the first RF amplifier
> >grid coil is shown unconnected in the manual, but at the following site a
> >diagram shows a switching arrangement that connects it to a socket with 3
> >pins, 63, 55, 64:
> >
> >http://www.rkk-museum.ru/vitr_all/exhibits/s509_e.shtml
> >
> >What is the function of the switching? It looks like the antenna terminal 
> A
> >gets grounded.
> >
> >73 de Neil ZL1ANM
>