[TowerTalk] Help with Force 12 C3S 10-Meter Adjustments

[Bob Richards]

On 11/12/2017 2:22 PM, Jim Brown wrote:
> On 11/12/2017 1:49 PM, Bob K6UJ wrote:
>> What I did was make sure
>> the driver tube was well lubed with Penetrox and slid it out in 1/2 " 
>> increments tillit got down where it was good down in the CW end of 
>> the band
>
> Of course. But the tricky part is being able to rig the antenna so 
> that SWR can be measured at sufficient height to remove ground 
> influence on the tuning AND the so that it can easily lower it for 
> adjustments. Or access the adjustments from a tall A-frame ladder 
> while it's in the air. While adjusting a very different 4-el for 10M, 
> I found that the frequency of lowest SWR went DOWN as I raised the 
> antenna, contrary to what usually happens with a simpler antenna like 
> a dipole.
>
> A rigging method we often use for portable operations like CQP, 7QP, 
> and FD uses the 4-ft 2-in o.d. surplus military mast sections in 
> combination with a tripod base fitting. If the "legs" are two elements 
> tall, additional mast sections can be pushed up through the center of 
> the tripod fitting. We use this to get a C3SS up 20-25 ft. We first 
> learned of this method from a talk that K7JA did at Visalia several 
> years ago.
>
> 73, Jim K9YC
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk