The GR group is looking for a particular AN . K1LKY comes up with a list:
https://www.ietlabs.com/genrad_history/historic_appnotes
This particular (old) AN might be an interesting read:
http://www.ietlabs.com/pdf/GR_Appnote/A68%20Lewis,%20Freq.%20
Robert,
> Is it dead because of Week-Roll over limits or something else?
It is a Week Roll-Over limit. In a working receiver, the time should be correct
with 3-D fix (min) but the date will be wrong. Some VP and UT+ Oncore
receivers may have failed but we have found that to be very rare.
Art
Nigel,
On 2021-06-23 11:32, Nigel gm8pzr via time-nuts wrote:
> The receiver fitted to the Z3801A is/was a Motorola 6 channel Oncore VP.
> It should be possible to replace this with a later 8 channel Oncore VP set to
> run in 6 Channel mode but a copy of Syntac or Tac32 will be needed to change
Hi
All of these small “telecom” Rb’s suffer the same way. The form factor is
similar
and they all dump a lot of heat out the baseplate. None of them do well with a
“down facing” simple heatsink
“Simple” answers:
1) Use a fan / forced air. That’s how they typically where used in most (but not
I mount my PRS-10 vertically (so that the channels between the fins are
vertical),
with the connector on top. This orientation was chosen simply for best
access to
the connector, but yields heat sink temperatures down around 45C to 50C.
The
unit is open and fully exposed to the air. I run it at
The receiver fitted to the Z3801A is/was a Motorola 6 channel Oncore VP.
It should be possible to replace this with a later 8 channel Oncore VP set to
run in 6 Channel mode but a copy of Syntac or Tac32 will be needed to change
the configuration.It's also possible that an 8 channel Oncore VP
My limited experience with the factory heatsink for the PRS-10 has left me
pretty unsatisfied. It seems ok for brief bench evaluation but not for
permanent enclosure installation. Reported unit temps are in the 70 - 75 °C
range with it sitting on a bench in a 25 °C room. It needs to be turned
