[time-nuts] GPS timing antenna 5 meter BNC Plug with cable

Brian Lloyd brian at lloyd.com
Fri Dec 6 10:37:00 EST 2013


On Fri, Dec 6, 2013 at 1:52 AM, Tom Knox <actast at hotmail.com> wrote:

>
>
> Amazing how reasonable some of these Chinese cables and other electronics
> are. The quality is also constantly improving. But I would see if they can
> use at least RG/142. It is more expensive but I would not recommend RG/58
> for a GPS antenna. Or even for distributing 5 and 10 MHz outputs if you are
> going for maximum performance.
>

I prefer RG-400 (teflon dielectric) myself but, yes, double shielded,
silver plated braid RG-142 is good.

At 40GHz bandwidth the 2.4mm connectors require precision machining. In
> addition the cable will need to act as a waveguide beyond about 30Ghz.
> Needless to say they will always command some serious money.  If you are
> going to that expense I would recommend 2.4mm to 2.4mm with a 2.4mm to
> 3.5mm adpater. An SMA connector will limit the cable to use below 20GHz.
> Skip at RDR has had some new surplus 2.4mm cables recently. He may still
> have some longer lengths. They are not $6, but they were reasonably priced
> and very nice.
>

I guess I'm a lo-fer then. I don't have anything that operates above 15GHz.

The amazing thing is that I once thought that 1GHz was the next step below
light. :-)

-- 
Brian Lloyd, WB6RQN/J79BPL
706 Flightline Drive
Spring Branch, TX 78070
brian at lloyd.com
+1.916.877.5067


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