hi

Just wondering a few things

I see the center pin on a typical N connector is pretty small

How much power could it hold at HF and also uhf/vhf
frequencies? Assuming a modern day high quality N connector??

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically for
higher power DIN?



thanks

ml wrote:
hi

Just wondering a few things

I see the center pin on a typical N connector is pretty small

How much power could it hold at HF and also uhf/vhf
frequencies? Assuming a modern day high quality N connector??

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically for
higher power DIN?


I don't know what you mean by 'hard line,' but 259/239 take legal power
and all I know everyone uses on RG8/ and up with legal power.

Marv

MTV wrote:
ml wrote:
hi

Just wondering a few things
I see the center pin on a typical N connector is pretty small

How much power could it hold at HF and also uhf/vhf
frequencies? Assuming a modern day high quality N connector??

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically
for higher power DIN?


I don't know what you mean by 'hard line,' but 259/239 take legal power
and all I know everyone uses on RG8/ and up with legal power.

Marv

At UHF? 1500 Watts through a PL-259?

MTV wrote:
ml wrote:
hi

Just wondering a few things
I see the center pin on a typical N connector is pretty small

How much power could it hold at HF and also uhf/vhf
frequencies? Assuming a modern day high quality N connector??

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically
for higher power DIN?


I don't know what you mean by 'hard line,' but 259/239 take legal power
and all I know everyone uses on RG8/ and up with legal power.

Marv

At higher frequencies and/or long runs the RG8 is a poor choice.

"ml" wrote in message
...
hi

Just wondering a few things

I see the center pin on a typical N connector is pretty small

How much power could it hold at HF and also uhf/vhf
frequencies? Assuming a modern day high quality N connector??

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically for
higher power DIN?



thanks

Hi ml

Can you find this site on the Internet?

Jerry KD6JDJ

"Jerry" wrote in message
...

"ml" wrote in message
...
hi

Just wondering a few things

I see the center pin on a typical N connector is pretty small

How much power could it hold at HF and also uhf/vhf
frequencies? Assuming a modern day high quality N connector??

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically for
higher power DIN?



thanks

Hi ml
Can you find this site on the Internet?
http://www.southwestmicrowave.com/mp...%20Coaxial.pdf


Jerry KD6JDJ

In article , ml
wrote:

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically for
higher power DIN?

ML-

I would expect hardline manufacturers to use a standard connector
intended for the power and frequency involved, but designed to fit the
end of their cable.

When hardline is chosen because of low loss rather than needing high
power, it is often used for long runs with a short flexible cable at the
end to connect to equipment. In this application, use of type N
connectors is common, with a female connector custom made to fit the
hardline.

You can get adapters for PL259/SO239, but those are lousy connectors for
RF. Their impedance is not constant from one end to the other!

Fred
K4DII

On Jan 10, 10:29*pm, Fred McKenzie wrote:
In article , ml
wrote:

The other * thing *i pondered * is that it seems * *the don't *make *
Pl259/so239 connectors for hardline, *so what do guys use *typically for *
higher *power * DIN?

ML-

I would expect hardline manufacturers to use a standard connector
intended for the power and frequency involved, but designed to fit the
end of their cable.

When hardline is chosen because of low loss rather than needing high
power, it is often used for long runs with a short flexible cable at the
end to connect to equipment. *In this application, use of type N
connectors is common, with a female connector custom made to fit the
hardline.

You can get adapters for PL259/SO239, but those are lousy connectors for
RF. *Their impedance is not constant from one end to the other!

Fred
K4DII

What I use on 7/8 hardline is a copper reducer with a barrel connecter
soldered
into one end and then I screw the combination over the hard line. Now
you have an output from the hardline that can fit most things . One
time I filled the copper reducer with dielectric before I inserted the
barrel connecter but could see no difference using max power.
Certainly a lot cheaper
than Andrews connectors and if the coax route is not ideal it is easy
and inexpensive to add flexible lengths at tight corners, such as
emerging from underground piping. Hardline gets extremely rigid and
the outer insulation is subject to cracking in the winter time which
is when I seem to have to work on things.
Art

I see the center pin on a typical N connector is pretty small

How much power could it hold at HF and also uhf/vhf
frequencies? Assuming a modern day high quality N connector??

The power handling capability of a connector is determined by both its voltage
limit and its current limit, whichever of the two is more constraining.

The N connector voltage limit is usually stated to be 500V (peak), corresponding
to an RF power of 2,500W over 50-Ohm impedance. Please note that the 500V limit
applies to the extreme environmental and conditions (e.g. temperature, humidity)
so, for a normal usage, the connector would well withstand more than 500V.

Conversely, I was never able to find a specification for the N connector current
limit. This will actually depend on the usage conditions, i.e. whether a
round.the-clock broadcast service, or an intermittent amateur service. With a
power of 2,500W, the rms current through the connector would be about 7A (at 50
Ohm), a value that, given the size of the inner pin, I would consider well
tolerable for amateur service. For a broadcast service instead it would perhaps
be safe not to exceed 1,000W at VHF, or somewhat less at UHF.

The other thing i pondered is that it seems the don't make
Pl259/so239 connectors for hardline, so what do guys use typically for
higher power DIN?

The PL259 connectors are low-cost connectors that are simply unknown in the
professional world. Main reasons a
- they do not offer a controlled impedance across the connector length
- they are not sealed, and hence offering no protection against humidity
- the ground connection is unsafe. If the connector does not remain well
tigthened under all operational conditions, one can never be sure on the
continuity of the ground path.

For hardlines there is a good choice of connectors, see
http://www.surplussales.com/connectors /HardLConnIndex.html

73

Tony I0JX

"Art Unwin" wrote in message
...

"What I use on 7/8 hardline is a copper reducer with a barrel connecter
soldered into one end and then I screw the combination over the hard line.
Now you have an output from the hardline that can fit most things . One
time I filled the copper reducer with dielectric before I inserted the
barrel connecter but could see no difference using max power. Certainly a
lot cheaper than Andrews connectors and if the coax route is not ideal it
is easy and inexpensive to add flexible lengths at tight corners, such as
emerging from underground piping. Hardline gets extremely rigid and the
outer insulation is subject to cracking in the winter time which is when I
seem to have to work on things."

Just remember that the aluminum to copper galvanic couple promotes the
corrosion of the aluminum. Keep the contact areas as dry as possible if
you don't want problems. I have found that wrapping several layers of
tightly stretched vinyl electrical tape and then spraying the area with
clear Krylon® acrylic varnish does a reasonable job. But since water vapor
can diffuse through the tape, you will need to check the connection
periodically.

73, Dr. Barry L. Ornitz WA4VZQ