Isn't "UHF Connector" an oxymoron?
73
Bill wa4lav
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of Peter Voelpel
[dj7ww@t-online.de]
Sent: Monday, November 11, 2013 1:35 PM
To: 'Amps'
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 2m equipment runs 2.5KW out via N connectors since 1988.
Of course all my connectors and relays are made in Germany by Spinner or RFS
and no Chinese or US crap.
73
Peter
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Carl
Sent: Montag, 11. November 2013 18:40
To: N1BUG; amps@contesting.com
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 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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