[TowerTalk] TowerTalk Digest, Vol 107, Issue 51

[wb0m at flashdog.us]

On Nov 21, 2011, at 6:36 PM, towertalk-request at 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)