We must credit the work of Mr Quackenbush at Amphenol for the firstconnector for the new Coax Cable 90 years ago.??
Yes, back then there was little work above 30 MHz so they filled a need.TDR a PL259-SO239 connection and they typically show about 30 Ohms.
3 cm of 30 Ohms in a long feedline like at 80 Meters is not a problem.?BUT!?? As the waves get shorter, it becomes a bigger deal.
toggle quoted message
Show quoted text
On Friday, March 1, 2024 at 05:48:55 PM CST, W0LEV <davearea51a@...> wrote:
The popular SO-239 / PL-259 are miserable connectors above 30 MHz.? They
are not an impedance-controlled connector and may vary all over the
place.? SMA connectors are well specified and controlled (except from
China).? And, yes, low power microwave is their primary application.
Because they are a good RF connector and considerably smaller than a BNC,
they have also found their way into the amateur handi-talkies.
Dave - W?LEV
On Fri, Mar 1, 2024 at 11:39?PM KENT BRITAIN <WA5VJB@...> wrote:
? Low Power Microwave work??????
Low Frequency as in the IF Connections?
PL259-SO238? Looks pretty bad at 1 GHz.? Worse higher than that.
? ? On Friday, March 1, 2024 at 04:52:24 PM CST, W0LEV <
davearea51a@...> wrote:
? No, SMA connectors are not PL-259 by any stretch.? But they are pretty
much
the standard for low-power microwave work.
Dave - W?LEV
On Fri, Mar 1, 2024 at 6:43?PM Schrille via groups.io <schnappie=
[email protected]> wrote:
same here.
This kit is absolutely scrap.after a couple of test,the mini connectors
died
The tread of one of these sma connectors is also bad
After a few tries, I threw the whole board? in the trash can.
--
*Dave - W?LEV*
--
Dave - W?LEV
--
*Dave - W?LEV*
--
Dave - W?LEV
