On Nov 21, 2011, at 6:36 PM, towertalk-request@contesting.com wrote:
>> A friend of mine is using an AH-4 mounted on roof top mast. End fed
>> antenna length is 84' and the ground wire from the AH-4 to a ground rod at
>> the base of the mast is 32'. The AH-4 seems to tune OK on all bands except
>> those frequencies below 3875 and 28500.
>>
>> Would appreciate comments from those who are familiar with the AH-4.
>>
>> Thanks,
>>
>> Joe k7mks
>
Hi Joe,
There is a Yahoo AH-4 group at "http://groups.yahoo.com/group/IcomTuner/"; if
you and/or friend are interested. Eric is correct about the AH-4's "dislike" of
1/2 wavelength multiples.
Here is a list of "desired" lengths that has circulated among AH-4 users
(numbers within parentheses are the range). BTW, a balun is not necessary when
using an AH-4, although a coax choke and/or ferrites are used used when RF is
getting back into the shack. Good luck & 73, Jeff/wb0m
27' (23-32)
40' (35-44)
58' (52-64)
76' (70-81)
95' (92-98)
109' (105-113)
145' (140-148)
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