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

[Bill Abate]

Doug,

I don't consider myself an expert but I have been using a video patch 
panel for RF for decades.  I use it for connecting my HF and VHF rigs to 
various antennas.  I have not had any problems nor experienced SWR 
problems ever.  I got the video barrel connectors from telephone company 
surplus.  They are hard wired and do not have BNC connectors.  I used 
them with 100 watt exciters and not the amps.  I read somewhere that as 
long as the impedence bump is only a few percent of a wavelength, it 
will have negligible effect.  Consider that coaxial switches like Heath 
and B&W do the same thing.


73 & GL,

Bill, K3PGB

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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