[Boatanchors] [BoatAnchors] My First "Forest Service" Radio

[john]

Hello Dave,

Great photos, and yes I'd enjoy hearing more about this rig. What's the 
PA...2E26? I'm kind of surprised at the quality of the construction. 
Somewhere around here I have a Forest Service -type rig and I don't 
recall anything like this level of construction quality (roller inductor 
PA, turret board component mounting, etc).

Do tell!

73
John K5MO

On 6/15/2016 1:01 AM, David Stinson via BoatAnchors wrote:
> Found a really cute little AM transceiver at the HamCom
> hamfest in Irving, Texas on 10 June:
> a Northern Radio Company type 450 AM transceiver,
> circa 1963.  It's marked with a BLM callsign but I think
> it was intended for "Forest Service" style operation.
> About the size of a shoe box.   It came from Alaska
> and had a KL7 call dymo-labeled on it.
> Not a single word available on the web about it, nor any leads from mail
> reflectors or boards, so out came the scope and the meter and started
> tracing.
>
> The transmitter filament circuit said the rig was
> 12 VDC primary power.
> TX and RX are both crystal-control on 6 channels.
> So far, I've determined that Channel 1 will cover 7160 MC, Channel 2
> will cover 5 MC, Channels 3 and 4 will do 75 M phone. Not certain about
> channels 5 and 6 just yet, but they appear to cover 6 MC.  I *think* you
> solder-up jumpers on the big bandswitch to decide what band of
> frequencies goes with what channel.
>
> The receiver is solid-state using early PNP germaniums,
> is sensitive and fairly selective.  455 KC IF.
> Transmitter is a solid-state supply, 6CL6 oscillator and 6146 PA.  About
> 12 W out properly matched.
> Output matching is similar to WWII rigs intended for
> short, capacitive antennas.  Reminds me of an "updated" and miniturized
> BC-669.
>
> Got it figured-out, crystalled-up and made the first contact with my old
> friend Ronnie W5SUM on 3885 this evening.  Photos at:
>
> https://goo.gl/photos/dmpa7cY3ddwfAUXc9
>
> If some folks want more details on this little rig, let me know and I'll
> write more about it.
>
> 73 DE Dave AB5S
>
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-- 
III