[ARC5] [Milsurplus] [BoatAnchors] FW: AVT-15 Tuning Charts

[Mike Morrow]

The SCR-288 would be an extraordinarily poor choice for such service.

The pilot in a light observation aircraft of that era definitely did not need a indirect-frequency-calibrated VFO-only transmitter and three PA tuning controls, a receiver that had no crystal-control option that was often battery-powered, a transmitter powered from a hand-crank generator, no PTT capability...just a panel switch, all in an awkward heavy cabinet impossible to open in flight, etc. etc.

Beyond all that, there would be no reason to put the BC-474 in any sort of aviation service.

Major components of a very typical Stinson light aircraft radio set would consist of:

AVR-20-A1   HF receiver, VFO or two Crystal-Controlled channels
AVT-112     HF transmitter, Crystal-Controlled
R-76/ARR-13 Beacon band receiver (Setchell-Carlson 512)
AVA-126     HV vibrator supply (12vdc) for the above

Yet another set combo used the older AVT-15 in place of the AVT-112 and AVA-126.

These seem to be an accurate representation of the radio gear in Stinson aircraft.  And all of it is more commonly available to a restorer, compared to the SCR-288.

Mike / KK5F

-----Original Message-----
>From: w8au at sssnet.com
>Sent: Apr 12, 2018 1:49 PM
>To: boatanchors at lists.theporch.com, ARC-5 <arc5 at mailman.qth.net>, mrca at mailman.qth.net, milsurplus at mailman.qth.net
>Subject: Re: [Milsurplus] [BoatAnchors] FW: AVT-15 Tuning Charts
>
>Question for AVT/AVR folks....
>
>Was the BC-474, an amalgamation of these two pieces of aircraft 
>gear  (my assumption)
>ever used in the L-4 and L-5 spotter birds?
>
>USS LST325 was outfitted as a L-bird carrier for the Pacific after 
>returning from the Normandy campaign.
>We have a big model L-4 hanging in the tank deck display area and 
>would like to add any information
>about any other type of radios used.
>
>Perry  w8au
>
>At 08:43 AM 4/11/2018, David Stinson via BoatAnchors wrote:
>>Can anyone help with this request, please?  An L-5
>>aircraft restoration project is asking.
>>
>>From: 42sentinel at comcast.net
>>[mailto:42sentinel at comcast.net]
>>Subject: AVT-15 Tuning Charts
>>
>>. I saw an old post of yours concerning the RCA
>>AVT-15 Transmitter. I'm presently restoring an old
>>Stinson L-5 which used those radios. I have almost
>>every item needed except for the Tuning chart
>>K-29457-1 and tuning chart instructions K-29456-1.