[time-nuts] Delay through GPS antenna splitter/amplifier -- ananswer, and a question

Lester Veenstra M0YCM m0ycm at veenstras.com
Mon Mar 12 22:52:15 UTC 2007


This is, incidentally, why isolators should be used on these runs.
This does create a problem with LNAs that are DC powered via coax, however
the reality is that many antennas and receivers do not have that great a
match to the coax impedance and could benefit from the clean up of an
isolator.  (however as magnetic devices, I wonder about the delay stability
of isolators as a function of temperature)

And while on the obsessive kick, if using splitters, unused ports must be
terminated.  

Group delay measurements of an RF transmission system can reveal a lot of
problems that simple loss and return loss will not catch.  

Lester B Veenstra 
M0YCM  K1YCM  M0YCM/6Y5  K1YCM/6Y5
 
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-----Original Message-----
<NIP>
John

......  minimise the effects of 
residual mismatches at either end of the cable.

Bruce

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