[TowerTalk] Ferrite beads for LDF4-50?

[Michael Tope]

I think the variety of type N connectors that don't capture the 
center-pin in the body of the connector are the ones that are prone to 
failure. On that variety of connector, the center pin is only attached 
to the center-conductor of the coax. With wide swings in temperature the 
differential CTE of the copper center-conductor relative to the 
dielectric causes the center-pin to migrate in and out. If there is 
enough differential contraction on the center-conductor, the resulting 
tension can cause the unconstrained center-pin to disconnect from the 
mating contact. I've seen this happen on long cables terminated with 
this type of N-connector.

73, Mike W4EF............

On 8/23/2025 8:39 AM, Wes Stewart via TowerTalk wrote:
>   Well, I'll fix that.  Connector losses are usually overestimated.  If they are well mated, loss is difficult to even measure.  But what they introduce is unreliability.  Type N connectors are, in my experience, unreliable when outside with the temperature extremes here in the desert.
>
>      On Saturday, August 23, 2025 at 07:45:48 AM MST, Mike Fatchett W0MU <w0mu at w0mu.com> wrote:
>   
>   The silence is deafening.
>
> On 8/23/2025 8:33 AM, Chuck Dietz wrote:
>> I have been thinking about this myself and I wonder if the connector
>> between the hardline and the rotor loop might have more loss than the
>> difference between the hardline and LMR400 ultra flex cable. In other
>> words, maybe just run LMR400 and not have a connector in line.
>> I have not done the math, but I think it would depend upon the total length
>> of the cable. Mine will go from the stackmatch to the bottom of the tower
>> where it will connect to 7/8” hardline.
>>
>> Chuck W5PR
>>
>> On Sat, Aug 23, 2025 at 9:09 AM Jim Miller <jim at jtmiller.com> wrote:
>>
>>> 6m beam. i have a rotator loop. this is for the longish boom run.
>>>
>>> i've got it all figured out so now to implement.
>>>
>>> i had no idea that ferrite beads over 1/2" hardline would be so
>>> controversial.
>>>
>>> jim ab3cv
>>>
>>> On Sat, Aug 23, 2025 at 8:58 AM Chuck Dietz <w5prchuck at gmail.com> wrote:
>>>
>>>> Jim, is this for a fixed antenna or a rotating tower? Or, is it for a
>>>> rotator loop?
>>>>
>>>> Chuck W5PR
>>>>
>>>> On Fri, Aug 22, 2025 at 5:44 PM Jim Miller <jim at jtmiller.com> wrote:
>>>>
>>>>> I found some. In stock. No problem.
>>>>>
>>>>> Jim ab3cv
>>>>>
>>>>> On Thu, Aug 21, 2025 at 4:54 PM Jim Miller <jim at jtmiller.com> wrote:
>>>>>
>>>>>> I'm redoing my 6m feed along the boom with LDF4-50 and would like to
>>>>> put a
>>>>>> string of type 43 cores along it.
>>>>>>
>>>>>> Has anyone here done that and what did you find to use? I'd like to
>>>>> avoid
>>>>>> including a normal piece of coax if possible.
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>> Jim ab3cv
>>>>>>
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