[Amps] "N, " "TNC" and "BNC" connectors are rated at 500 Watts and work at 1, 000 Watts as log as the load is good..**

[Louis Parascondola]

Carl, were you ever #1 honor roll?


Luckily no contest or new one for DXCC was involved (-;

Carl
KM1H





-----Original Message-----
From: Carl <km1h at jeremy.mv.com>
To: Roger (K8RI) <k8ri at rogerhalstead.com>
Cc: amps <amps at contesting.com>
Sent: Mon, Nov 11, 2013 7:39 pm
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..


Are you sure those were real Amphenols and not copies?
I blew out several no names that looked OK when I first built the phasing 
for the various stacks for 10-40M.
After the 5th or so I stripped every one out of the system and retaped. 
Luckily no contest or new one for DXCC was involved (-;

Carl
KM1H


----- Original Message ----- 
From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
Cc: "amps" <amps at contesting.com>
Sent: Monday, November 11, 2013 4:33 PM
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..


> On 11/11/2013 7:46 AM, Dr. David Kirkby wrote:
>> On 11 November 2013 08:04, Roger (K8RI) <k8ri at rogerhalstead.com> wrote:
>>> 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 had several double female Amphenols short out, used for splicing in 
> rotator loops and smaller coax feed to the sloping dipoles. They still 
> looked like new and I wanted to keep them for examples, so they now have a 
> band of red tape around the middle. They look OK and an OM meter shows 
> them to be OK, but they won't work even with a 100W on 75 or 40.
> The red tape is because the inevitable happened and one found its way back 
> into the system.
>
> I forgot to mention the part about being easy to assemble, but fussy about 
> dimensions.
>
> Another problem with N type and non captive pins is the coax center 
> conductor migration.  This is a problem in vertical runs and feeds to 
> sloping dipoles that swing in the wind.
>
> With vertical runs the linear migration can normally be solved with 
> LMR-400 and 600 by making a 1 or 2 turn coil just before the connector 
> (top and bottom). As long as the radius is not too tight, I've never had 
> it migrate in turns
>
> 73
>
> Roger (K8RI)
>
>> I suspect part of the problem is that they are often not assembled
>> properly. Often the male or female are too far forward or too far
>> back, which gives a less than optimal electrical contacts, and I
>> suspect thermal contact too.
>>
>
>
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