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.
73
Roger (K8RI)
Charles Harpole
k4vud@hotmail.com
Date: Sun, 10 Nov 2013 22:05:46 -0500
From: ka4inm@gmail.com
To: amps@contesting.com
Subject: [Amps] "N, " "TNC" and "BNC" connectors are rated at 500 Watts and
work at 1, 000 Watts as log as the load is good..
Hi Bill WB6RFW:
<<
Now that I'm in the middle of doing a QSK mod to the Henry 2KD-4 ... I'm
looking at the BNC input connector to the amp. It occurs to me that if I
use my FT-2000D barefoot through the amp I may be pushing the BNC pretty
hard at 200W. I can't think of a time I've ever put that much power
through a BNC. There's also that piece of RG-58U in there. I guess I've
put 200W pulse from a transponder through one but it's pretty low duty
cycle.
Maybe I shouldn't worry so much ...
>>
--
Ron KA4INM - Youvan's corollary:
Every action results in unwanted side effects.
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