[time-nuts] GPS Antenna Feed Line Decision
wes at triconet.org
Sun Sep 3 10:09:37 EDT 2017
On 9/2/2017 4:48 PM, Clay Autery wrote:
> Thanks for the response...
> Not sure why you and the other guy both recommended RG-6 75-Ohm cable
> and F-connectors, when the nominal impedance of literally everything
> else in the system is 50 Ohm, including the antenna and the HP GPS
> Distribution Amp.... And then adding N to F adapters?
As "the other guy" (I think) let me say that the impedance mismatch is
immaterial and in my case I have one GPSDO with an SMA connector and another
with a BNC and an antenna with an SMA. So I "adapt" no matter what I do.
Because I understand the cascaded noise figure equations, I know that I don't
need an active distribution amplifier to feed just these two devices, so a $5.00
"F" connector splitter is adequate.
> Doesn't make any sense unless one has $$ as a top priority, already has
> a spool of RG-6 quad shield, etc... but I specifically stated that $$
> is not a top priority.... Not really even in the top 5 or 10...
Then by all means you should use L-band waveguide. :-)
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