[TowerTalk] Ferrite beads for LDF4-50?

[Richard (Rick) Karlquist]

I have had this behavior on dozens of Type N's.

73
Rick N6RK

On 8/24/2025 11:41 AM, Michael Tope wrote:
> 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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