[Boatanchors] My First "Forest Service" Radio

[Bry Carling]

Yes - cool radio!

I sold a similar rig to this a little while back. They don't run much power and would be an excellent novelty 
AM radio. It's surprising what can be accomplished using 15 - 20 watts of AM.
I wish more guys would try it. I remember many QSOs using 30 watts of screen mod AM back in the 1960s using my Knight T60 rig!

73 - Bry AF4K

http://NoviceRigRoundup.com

> From: arc5 at ix.netcom.com
> To: milsurplus at mailman.qth.net; boatanchors at mailman.qth.net
> Date: Wed, 15 Jun 2016 00:01:55 -0500
> Subject: [Boatanchors] My First "Forest Service" Radio
> 
> 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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