W5SWL is a good person to buy adapters from. Prices are reasonable and he has just about everything. eBay store or .
73
-Jim
NU0C
On Mon, 5 Oct 2020 09:59:02 -0700
"Jim Lux" <jimlux@...> wrote:
On 10/5/20 8:12 AM, vitovsky.petr@... wrote:
Hello,
I ordered NanoVNA and it should arrive this week. I'm building wire dipole for my CB and I would like to measure its SWR. The problem is that I will be using the PL-259 connector and the NanoVNA I ordered has only SMA. The PL connector is not attached to the coax (RG-58) yet. Is it possible to measure the SWR just by attaching SMA to the coax
provisionally and replacing it with the PL when I'm done? Or do I have
to buy SMA to PL adapter?
Get yourself some SMA to PL-259 adapters (actually, what you probably
want is SMA to SO-239 jacks..
There's two ways to go about it.
a one piece adapter (I got a set of all 4 gender combinations for <$10
from amazon - )
A short cable with SMA on one end and PL-259 (I had one from my mobile
rig installation a while ago, about 12" long).
if you go on amazon and search "SO-239 SMA pigtail" you'll get a bunch..
Looks like a pair of 6" ones is $10
I prefer the pigtail - cables with PL-259s tend to be fairly stiff, so
having some inches of small diameter cable in between reduces the stress
on the VNA.. you really, really do NOT want something like 0.405" coax
directly connected to the VNA - you might snap the connector off the board.
Thanks for any advice, as a newbie I really appreciate it.
Jim Shorney