开云体育

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Darrell Carothers
Sent: 15 August 2020 21h50
To: [email protected]
Subject: Re: [nanovna-users] We started selling SAA2 with N-type RF connector and 4-inch display

Where can you purchase them with N type connectors?

Darrell

Sent from my over-rated IPhone 7 Plus. Any Mis-spellings or grammar errors are due to my IPhone auto correct feature.

On Aug 15, 2020, at 13:38, Dana Whitlow <k8yumdoober@...> wrote:

?SMA connectors (as opposed to 3.5 mm connectors) have extremely thin
walls and are therefore very intolerant of bending forces and/or overtightening.

Many are the times when I see someone stacking up several items on an
equipment-mounted SMA(f) connector. All it takes is a modest
accidental sideways tug on the cable connected to the free end of the
stack, and that's all she wrote. It's time for the equipment to go to
the repair shop for connector replacement, and for you the user to be
without the use of the equipment for perhaps a couple of weeks or more.

For this reason I strive to avoid test equipment with panel mounted
SMA connectors. While not cheap, N-to-SMA adapters are user
replaceable in a minute or so, and much less expensive than a trip to the repair facility.

When stuck with a unit that does use a panel mount SMA connector, I
fall back on plan B: use a flexible cable a few inches long between
the SMA on the panel and whatever is next in the chain.

Note that 3.5 mm connectors are more robust in this regard, although
not totally so. The use of air dielectric in the 3.5 mm connectors
permits maintenance of the desired impedance without resorting to such
thin walls and delicate thin "fingers" on the pin receptacle. Also.
3.5 mm connectors mate well with SMAs, so one is not forced to
immediately abandon all his SMA goodies to take advantage of the 3.5 mm connectors'
benefits.

Dana