[time-nuts] WWVB Antenna revisited/Spectracom 8182

[D. Resor]

I've been reading and researching what I will need to connect a Spectracom
8182 Netclock/2 for use here at home as a WWV(B) clock.

 

I found a post response from Feb 23, 2005 by Brian Kirby which includes the
a link for a preamplifier schematic here:

 

 
<http://www.febo.com/pipermail/time-nuts/attachments/20050223/94b9bd2c/attac
hment-0008.pdf>
http://www.febo.com/pipermail/time-nuts/attachments/20050223/94b9bd2c/attach
ment-0008.pdf 

 

According to all information I have been able to gather, in California I
really don't a preamplifier.   However the Spectracom 8182 manual discusses
the use of a preamplifier (8207) with their antenna as "part of the system".


 

My train of thought is, the 8182 superimposes 10.7vdc on the antenna BNC for
powering the inline preamplifier.  If I do not use the preamplifier will
this DC voltage create problems and attenuate the RF signal? Will the
comparator circuit in the 8182 show the antenna to be open and therefore not
operate correctly?  Would a decoupling network to prevent the DC voltage
from reaching the antenna create the same problem?

 

Lastly I see in the preamplifier schematic DC power is used to power the
transistors (+9 input) and how 60Khz is 80 mV P-P amplified signal is shown
as an output signal (near Q4).  I must be missing something as it doesn't
show how the RF signal coupled back to the input, unless of course C8 (the
1.0uf capacitor) is how it is coupled back.

 

There are several jumpers within the 8182 but the manual does not seem
discuss these. The datasheet for the 8165 disciplined oscillator discusses
on Page 5 about the "Switch A1S1" which will appears to enable/disable the
DC preamplifier voltage.

 

https://www.atecorp.com/ATECorp/media/pdfs/data-sheets/Spectracom-8206_Manua
l.pdf

 

Thanks

 

Donald Resor

N6KAW