[GreenKeys] Northern Radio Manuals Needed

[Roy Morgan]

At 04:46 PM 6/14/2005, boatanchor at martasystems.com wrote:
>I have 2 Northern Radio Company type 105 Model 4A F.S. Keyers and need a
>manual, or at least a schematic. One of them has an additional military tag
>on it that reads: "1760-213575937 P/N 2C2711-2 JUN 55 USAF". Any info on
>these would be helpful, and I'll be glad to pay for a manual, or to have
>yours copied...

Hi, ?,

I have a manual for this unit, and also one of the things itself, though 
the "model 4A" part is not familiar.  I'll be glad to make you a copy..send 
your address.

Although I have not gotten mine in operation yet, here are some points I 
remember about it:
  - Basically, it is a reactance-tuned 200 kc oscillator that is mixed with 
the output from an internal crystal oscillator (three ? crystal sockets) or 
from an external master oscillator (the Model 115, I think.)
- the output is in the 2.0 to 4.0 mc range
- the transmitter multiplies the output up to operating frequency
- there is provision to account for the up-multiplication in setting the 
shift (that is, the actual shift is divided by the multiplication factor 
you are using.)
- In choosing the crystal, or external master oscillator frequency, you 
must account for the 200 kc difference and the multiplication factor.

I'll be glad to get your experience with the thing once you get yours running.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Cell 301-928-7794
Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan at nist.gov --