[time-nuts] HP 10811 Response I Replies

[Rick Karlquist]

WarrenS wrote:
> Does your Mode B 10811 use a different xtral or same xtral, different
> frequency?
> What does Mode B do better, ... and worse?
> Why was it not used in the 10811?

Mode B is the same crystal on a different frequency
(about 10.95 MHz).  It does not have a turnover and
the tempco is much higher than mode C.  It makes
a very sensitive thermometer and is therefore useful
for evaluating the oven.  The reason is not used in
a production 10811 is obviously that for timebase
use, you definitely don't want a high tempco.

Rick