I should have mentioned this clearly earlier, but all converting and switching,
then measuring happens in ONE 2U rack case. Length of each cable is minimal.
I thought mention of TICC would make it sort of clear but it didn't.
I have LOTS of coax relays. I'll use them. It's a gross overkill but I've
seen 80s HP equipment have overly generous parts selections, too. It's hard to
explain EXACTLY as the contraption isn't built yet. That made it necessary to
use generic terms. I apologize for causing confusion.
---------------------------------------
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
On Sunday, July 7, 2019, 12:00:52 AM EDT, Glen English VK1XX
<[email protected]> wrote:
Hal, Good point.
and I have never seen a spec for phase stability for Cat-7 cable !
for RG58, OR OTHER polyethylene, might be up to 150ppm /deg C. maybe as
good as 10 ppm/deg C for some LMR.
With 1000 feet of cable might be an issue for fine stuff. a few nano
seconds each way over temperature might not matter for his project...
I forget it is not a microwave RF VNA application. Easy to resolve
anyway with a difference balance term somewhere.
g
On 7/07/2019 11:23 AM, Hal Murray wrote:
>> coax cables are in general NOT PHASE STABLE with temperature, either.
> Is twisted pair any better?
>
>
>
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