[TowerTalk] Replacing Linear Loading on Force 12 40/20

[Richard Thorne]

Ken at JKantennas (jkantennas.com), is now handling the F12 stuff.

Not sure if he has coil upgrade kit's or not.  Not sure if he's changing 
them up electrically, but he's improving them mechanically.

Rich - N5ZC

On 11/5/2017 3:08 PM, Tom LeClerc W1TJL wrote:
> I also have a C4-XLD and have been having issues with the linear loading.
> I did some searching on the net to see if these loading coil conversion
> kits are still available and if so, from where.
>
> Any ideas?
>
> Thanks in advance and 73, Tom
>
> On Nov 5, 2017 08:11, "Keith Dutson" <kdutson at sbcglobal.net> wrote:
>
>> I have two F12 C-4XL antennas.  The linear loading design of the 40 meter
>> elements proved efficient, but resulted in discovery of a major mechanical
>> issue: it was easily damaged in high wind areas.  Although not observed, I
>> believe the failure was caused by vibrations, which affected all mechanical
>> joints.
>>
>> Tom N6BT recognized this problem and subsequently offered a conversion kit
>> to replace this loading system with loading coils.  A relay at the feed
>> point adds inductance to lower resonant frequency to the CW portion of the
>> band.  Two of these kits were purchased.  One was installed and
>> successfully
>> tested at 20 feet.  It is currently on the ground, in pieces, awaiting
>> cleanup, assembly and installation.  The other antenna is at the top of the
>> tower, and will be taken down for conversion.  I am thinking about tuning
>> one for CW and the other for SSB, thus eliminating the relays and control
>> cables.  A WX0B Stack Match will connect the two antennas for operation.
>>
>> 73, Keith NM5G
>>
>> -----Original Message-----
>> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Ray
>> Conrad NM2O
>> Sent: Saturday, November 4, 2017 9:56 PM
>> To: towertalk at contesting.com
>> Subject: [TowerTalk] Replacing Linear Loading on Force 12 40/20
>>
>> I have a Force 12 40/20. The 40 Meters is a two element beam, using linear
>> loading. The loading is made from coperweld wire. I'm in NNY and subject to
>> icing each winter.
>>
>>
>> Has anyone converted to a loading coil to replace the linear loading?
>>
>>
>> The result ould be similar to the Cushcraft 2 el 40 Meter that uses a
>> loading coil.
>>
>>
>> 73,
>>
>> Ray
>>
>> NM2O
>>
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