[Test-Equipment] Does it really make a difference over the short haul ????

[Glenn Little WB4UIV]

I worked in broadcast TV.
Internal to the jack may be a chip terminating resistor.
On the panels we used this could be removed by disassembling the jack.
I would use the 75 Ohm panel as a receiver patch panel without question, 
if you are using HF or low VHF.
It might get iffy at UHF and above.
I would not run power through the jack without removing the terminating 
resistor as it would probably burn.

73
Glenn
WB4UIV

On 9/1/2020 8:00 PM, Doug Hensley wrote:
> This question is for the experts on this list.
>
> The Trompeter Company in California for many years manufactured patching panels that were used by both military & broadcast operations.  Some were 50 ohm but most were 75 ohm for video patching.
>
> All these panels used BNC's on the rear and the famous Trompeter barrel socket on the front.  50 ohm set ups were made but most readily available are 75 ohm.  The distance from the rear BNC center pin to the Trompeter barrel pin is less than an inch.
>
> Question 1:  Given 50 ohm cables are used front & back, does using a panel that is rated for 75 ohms really amount to a hill of beans regards ham use?
>
> Question 2:  If the panel itself has negligible affects, can short 75 ohm patch cords be used for RF without degrading the signals?
>
> Not sure how else to ask this.
>
> Does anyone know?
>
>
> Doug W5JV
>
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> Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.
>
>
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-- 
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Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"