[time-nuts] Vintage Frequency Measurement

Alan Melia alan.melia at btinternet.com
Sun Feb 12 19:47:47 EST 2017

Hi Dan yes that is 5e-6 about all an unstabilised (temp) AT could hold for 
any period. I guess there were no WWV or MSF signals around then. When a 
good source was available off-air it was possible to do better than that. In 
service it was probably "dont waste time trying to better the minimum 
requirement. The transmitter you are looking for wont be that accurate or 

In 1960s I saw several BC-221s in the racks at the Rugby LF and HF stations 
acting as standby frequency sources (VFO) for rapidly running up a 
transmitter on an unusual frequency (not a normal route) for which they did 
not have a crystal available.

----- Original Message ----- 
From: "Dan Rae" <danrae at verizon.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Sunday, February 12, 2017 11:11 PM
Subject: Re: [time-nuts] Vintage Frequency Measurement

> To put BC-221 things in perspective, the 1 Mc/s reference crystal was 
> adjusted, according to the manual, to within 5 c/s...
> Things have come a ways since!
> Dan
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