[R-1051] 100CPS Synth Schematic

[John Schmitz]

Dennis,
No, I didn't need to tap off the A3 board, this is already done as the
6-pack I have has the 100cps module in it and all that is already wired.
What I need to do is make this 6-Pack work in a non B 1051. To do it I need
to supply the 6-pack only what it needs to make 100cps synth outputs at 000
and 500. I have determined that it requires one wire be moved on J12/P1 and
3 wires added to J12/P1. Also requires that I rewire the 000/500 switch a
little bit, and finally I have to make a 100cps control board that mounts on
the chassis behind the switch. I have the J12/P1 wiring and the switch
rewiring done, I'm making the 100cps control board now.

My 100cps synth has the IC's in it.


-----Original Message-----
From: r-1051-bounces at mailman.qth.net
[mailto:r-1051-bounces at mailman.qth.net]On Behalf Of Dennis McLaughlin
Sent: Tuesday, March 06, 2007 8:44 PM
To: R-1051 Discussion Group
Subject: Re: [R-1051] 100CPS Synth Schematic

John Schmitz wrote:
> Al,
> Thanks, got the scans. The test was successful, I was able to get the
100cps
> synth to produce the correct outputs for 000 and 500 so I'm going ahead
with
> the build out of the modification. I will post it up on the web when I get
> it done. Will probably take me a week or so.
>
> Thanks to all who responded.
>
> John
>

John,

Cool

Did you tap off the A3 board and invert the signal for the 100 syn module?

Does your 100 syn module have IC's in it or is it cord wood constructed
two transistor flip-flops?  Mine has the transistor flip flops.  I am
wondering if the Fairchild micrologic IC were hard to get at the time,
and the life of micrologic RTL was short, so they redesigned it using
the transistor flip flops. This must have been a expensive module to
build and repair.

I have a R-1051.  Bought a spare six pack on ebay.  It has a 100 syn
module.  The chassis for the six pack and the spectrum generator are
different, but all are good for spare parts on the plain R-1051. Only
the A4 board is different on the spectrum generator.

The megacycle syn has the output agc circuit in it.  Two additional
holes in the upper left corner of the cover marked TP1 and R11.  I saw
the extra A4 board for sale on ebay a while back. I haven't tested it yet.

The 1 & 10 kc syn looks the same.  It has a bad crystal.

The 100 kc syn has some transistor type changes, some bias changes on
the transistors, some additional shielding, additional bypass caps, and
extra board grounding wires. The A1 board has only one transistor on it.
The module has a bad FL1 filter.

The RF translator.  Wow.  Many changes. Looks like they changed the
mixers to diode ring mixers using Fairchild JAN1N4307 quad diodes. 2N
2219 transistors were added I assume to add more gain to drive the
mixer.  Two toroid transformers per mixer and a toroid choke.

Does anyone know if this improved the performance or the receiver.

I am talking too much.

Dennis


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