My 2M amp runs a solid 1500W with N connectors at the amp, transfer relay,
Bird line section, and up at the rotor loop, power divider and antennas.
Never blew one.
Of course all are US made mil spec from hamfests, etc and no import crap.
The 432 military cavity ran 1000W AM carrier, 4000W PEP, thru N's. I guess
its all in the details such as who made them. I cant run that amp at 1500W
here without upgrading the feed and antennas.
Carl
KM1H
----- Original Message -----
From: "N1BUG" <paul@n1bug.com>
To: <amps@contesting.com>
Sent: Monday, November 11, 2013 6:58 AM
Subject: Re: [Amps] "N, " "TNC" and "BNC" connectors are rated at 500 Watts
and work at 1, 000 Watts as log as the load is good..
My weak mind is trying to understand the problem. Maybe it's something to
do with the imbalance of the antenna?
I ran QRO significantly exceeding this definition through N connectors at
144 MHz for many years without ever losing one. SWR was often well above
2:1 (more than 3:1 with any ice or snow) and the feedline typically was
150 feet or less of Andrew LDF5-50A (7/8 heliax), with runs as short as 60
feet being in use most of the time. There was an N connector at the
transmitter end too.
I can think of others who have abused N connectors even more without
problems.
73,
Paul N1BUG
On 11/11/2013 03:04 AM, Roger (K8RI) wrote:
On 11/11/2013 2:03 AM, Charles Harpole wrote:
Notice that the Alpha 76a warns to put no more than 100 watts thru it on
stand by.
Having used, misused, and abused N-type connectors, experience in the
real world has shown me that these are not connectors to use for QRO.
Yes, I know hams who have used them at the legal limit for years,
I have found N-type will run the legal limit if the SWR is low AND to
you QRO is not 1 watt over the 1500 and usually at the end of several
hundred feet of inexpensive coax.
With a center fed, sloping dipole, which is far from being a balanced
antenna, I have blown Male and the double female connectors by moving 50
to 100 KHz off resonance. I've also had nearby lightening strikes take
them out.
I'd prefer DIN 7-16 connectors, but haven't found a source at reasonable
prices. Although their construction is such that a small shop could
easily copy the design.
UHF connectors are fine if properly weatherproofed and the loss through
50 MHz isn't enough to be worth mentioning. I just do not like their
lack of strength and they start to get expensive to fit LMR-600.
I'd limit my use of BNCs to a 100 watts as do you or replace them with
UHF or N type for a couple hundred watts.
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