[ARC5] Crystals in WWII

[Geoff]

Werent most if not all aircraft TX up to then just free running oscillators 
such as the BC-191, 375, and the big Navy rigs, etc.  Even USN shipboard 
were variable. The Army ground troops and mechanized used lots of crystals.

Carl


----- Original Message ----- 
From: "Robert Eleazer" <releazer at earthlink.net>
To: <arc5 at mailman.qth.net>
Sent: Friday, March 15, 2013 7:54 PM
Subject: Re: [ARC5] Crystals in WWII


>I always thought it quite odd that so much US WWII equipment used a crystal 
>to manually tune a VFO to the correct frequency.  Did they do this as a 
>back up, so that the equipment could be tuned without a crystal, in case 
>crystals were not available?
>
> Gordon wrote about the prewar exercises in which crystal distribution was 
> found to be an unexpected nightmare, leading to the design of the ARC-5 
> series with VFOs.
>
> Or did they design the other military sets for VFO and then ended up using 
> crystals because production caught up to demand and they were available?
>
> Wayne
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