Re: QCX mini: RF output BNC or SMA #poll-notice

Arv Evans


I use mostly RCA connectors for low level RF.    8-)

If the connectors mount on the chassis panel and connect to the PCB
by short wires, this connector thing goes away.  Users can use whatever
connector they prefer.  Not providing a specific connector could also lower
the price by a few pence?


On Thu, Aug 6, 2020 at 7:41 AM Hans Summers <hans.summers@...> wrote:
Then I say "VOTE BNC!"

73 Hans G0UPL

On Thu, Aug 6, 2020 at 4:39 PM Dave <VE3GSO@...> wrote:
The SMA is only rated for 50 mate/demate cycles, and that is for the real gold plated versions. Quite a nice connector for applications that call for a very few disconnects, like inside equipment.

There is a reason why the BNC is found on scopes and signal generators, etc.

The TNC is a close relative of the BNC, without the vibration induced connection noise.


On Aug 6, 2020, at 09:34, Hans Summers <hans.summers@...> wrote:

Hi Russ

I have to admit to a preference for BNC. 

What kind of issues have they seen? 

73 Hans G0UPL

On Thu, Aug 6, 2020 at 4:28 PM Russ@va3rr via <> wrote:
The NanoVNA group has been seeing some issues with SMA connectors.

It's too bad TNC connectors aren't more prevalent in amateur equipment.  I have some LMR cables with TNC connectors and they really are quite robust...

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