[R-1051] 100CPS Synth Schematic

[Dennis McLaughlin]

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