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
stable"
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.
Alan
G3NYK
----- Original Message -----
From: "Dan Rae" <dan...@verizon.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts@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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