Hi:
Here's a GR 358 wavemeter from the 1920s. Someone noticed the GR logo after I made the web page that led to it's
identification. Hence the generic page URL.
http://www.prc68.com/I/Wavemeter.html
Covers 14 to 220 Meters (21 to 1 MHz) in four bands selected by which inductor
you connect to the variable capacitor.
Resonance indicated by pilot light bulb. The peak indication depends on the system Q and so at higher frequencies is
not very good.
The microwave cavity wavemeters attached to the message from Wes have a much
narrower peak and so are more accurate.
Wes: Is this the patent for the IMPATT diode power amplifier?
https://patents.google.com/patent/US3931587
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
-------- Original Message --------
I have a General Radio Type CAG-60098-A Precision Wave Meter made for Navy
Department - Bureau of Ships according to the nameplate. According to
Wikipedia that would date it between 1940 (when bureau of ships was
created) and 1966 (when abolished). It has an inductor in sort of a
"hockey puck" labeled 16-50 kc that plugs into a socket on the front panel.
Inside is a very nicely made variable capacitor with a vernier drive. It
has been a while since I had it apart, but there is a diode in series with
the meter and not much else as I recall. The meter scale is 0-200
(microamp?) and the capacitor scale is 0-75 with no other marking. I have
no manual, but I assume there were other inductors for different frequency
ranges with a calibration chart to interpret the 0-75 reading. It must
have been made to test transmitters by tuning for peak reading on the meter
and determining the frequency from the dial reading.
a different Alan (KE7AXC)
On Sun, Feb 12, 2017 at 5:47 PM, Alan Melia <alan.me...@btinternet.com>
wrote:
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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