JB wrote:
The "N" male will plug into a "BNC"
female,the BNC without its locking ring will plug into an "N"female!

The N male pin is usually larger than the BNC fem center receptacle. This
results in a BNC female with increased loss or breakage due to fatigue.
This was known in the extended technical community of my experience as a
GRONK!


Like I said, we "permanently" adapt N to BNC inside the lab. I've never
used an N in a situation where a BNC wouldn't have worked*. I guess the
threads make the connection more permanent, but now we have the TNC for
that.

*Check that. I did need a 75 Ohm N jumper once to get from a 7/8" line
to the back of a Moseley STL receiver.

Like I said, we "permanently" adapt N to BNC inside the lab. I've never
used an N in a situation where a BNC wouldn't have worked*. I guess the
threads make the connection more permanent, but now we have the TNC for
that.

*Check that. I did need a 75 Ohm N jumper once to get from a 7/8" line
to the back of a Moseley STL receiver.

Aside from power and sweep checks on 800 and above (where issues really
show) BNC seems to do well. Most RG58 double shielded types seem to be
lossy though. Even for short jumper runs. PL259 junctions are completely
worthless and measurements are meaningless. Sweeps are impossible because
of all the reflections. N can be adapted to anything else with much less
loss than from anything else. I was aware of this long before I built my
brand new Heath HW-2036 synthesized rig and replaced the RCA phono jack with
a BNC bulkhead as I built it.

Some of our more expensive equipment would get a N male to N fem adapter
just to save wear on the threads, but N male to BNC fem adapter would be
most useful most of the time. It's bad luck to use the internal load when
you can use a sample port anyway.

My stock Collins HF amp has an N output connector and it's 40+ years old.
BTW it has an RCA phono jack for the input. These actually have better loss
characteristics to uWave than the SO239 except for lack of proper retention.

JB wrote:
Like I said, we "permanently" adapt N to BNC inside the lab. I've never
used an N in a situation where a BNC wouldn't have worked*. I guess the
threads make the connection more permanent, but now we have the TNC for
that.

*Check that. I did need a 75 Ohm N jumper once to get from a 7/8" line
to the back of a Moseley STL receiver.

Aside from power and sweep checks on 800 and above (where issues really
show) BNC seems to do well. Most RG58 double shielded types seem to be
lossy though. Even for short jumper runs. PL259 junctions are completely
worthless and measurements are meaningless. Sweeps are impossible because
of all the reflections. N can be adapted to anything else with much less
loss than from anything else. I was aware of this long before I built my
brand new Heath HW-2036 synthesized rig and replaced the RCA phono jack with
a BNC bulkhead as I built it.

Some of our more expensive equipment would get a N male to N fem adapter
just to save wear on the threads, but N male to BNC fem adapter would be
most useful most of the time. It's bad luck to use the internal load when
you can use a sample port anyway.

My stock Collins HF amp has an N output connector and it's 40+ years old.
BTW it has an RCA phono jack for the input. These actually have better loss
characteristics to uWave than the SO239 except for lack of proper retention.


I have a 30L-1. Some day I'll hook it up.