[time-nuts] ThunderBolt question

[Wes]

Conventional wisdom says yes to this. I'm not so sure, if the cable is 
well-made, but some of the stuff is really garbage.

I'm using RG-6 cable purchased at DX Engineering, mainly because I had a gift 
certificate for my last order.  It's quality stuff, but if you're going to use F 
connectors be sure they will work with quad-shielded.  I bought some (blue) that 
were claimed to work and there was no way in hell that I could get them on.  I 
had to buy another batch (purple) that do work.

Regarding mismatches; my recently installed antenna is a PCTEL 
GPSL1-TMG-SPI-40NCB.  This is advertised as a "timing" antenna, so I assume 
they're worried about timing. The data sheet says the "nominal impedance" is 50 
ohm.  But....the VSWR spec is <2.0:1. Of course this antenna has an internal 
amplifier (40 dB), whose match to the helix antenna is unknown but I'm guessing 
it's for NF optimization.  So is the spec the nominal output Z (s21) of the 
internal amplifier or is it the load the amplifier needs to be presented with to 
deliver advertised gain?  Who knows?  Either way, my 75 ohm coax is within limits.

Wes  N7WS





On 6/5/2020 4:56 PM, DON MURRAY via time-nuts wrote:
> Robert...
>
> Try to find QUAD SHIELD RG-6.
>
>
> 73
> Don
> W4WJ
>