[Milsurplus] Aircraft use of freq meter

[Brooke]

Hi Brenda:

While learning about the technical aspects of the LM 18 I discovered that they had a lot of very sophisticated 
temperature compensation. Pretty much every component related to frequency has design elements aimed at temperature 
stability.
https://prc68.com/I/USM159.html#LM_18_Frequency_Meter

I can think of a couple of reasons the on board frequency meter would be used:
1. If a new frequency was learned via a radio message, or
2. a plane landed at a facility were there was minimal ground support and the radioman needed to setup a new frequency 
list for a new mission.

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> Date: Wed, 1 Oct 2025 17:53:11 -0400
> From: Brenda Gentry<ka2ivy at verizon.net>
> To:milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] Aircraft use of freq meter
> Message-ID:<64f663cc-7e7d-8ba1-f1d7-6e4b16e8da8a at verizon.net>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> I have had the same question for some time. Would an operator need to
> change frequency that often in flight? If the practice was to "net" all
> of the transmitters before takeoff, wouldn't it be quicker to do it with
> an airfield reference?? How accurate would it be at 20 degrees below
> zero at 25,000 feet?
>
>   ?? B.Gentry, KA2IVY

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