Frequencies on VHF
Heine De Villiers
I normally use ORRA 1 which is on 152.6625 ,but also occasionally ORRA2
which is 161.1500 and then to add to the confusion the LCCSA is on
149.0375 .
I know that on HF such big differences would seriously whack your SWR ,
but I don't know if it is as bad on VHF.
So do I take the pain and just trim my antenna for the middle somewhere
, or do I carry 3 whips ?
Hmmm whips , now my mind is going elsewhere :-P
Thanks
Heine
Peter Tiedt
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Eric (A.H.) Sommer
Heine
For OPTIMAL send/receive, different whips.
BUT, if you go for the short antenna (1/4 wave) then
Frequency ½ Wave 5/8ths wave ¼ Wave
ORRA 1 152.6625 982mm 1228mm 491mm
ORRA 2 161.1500 930mm 1163mm 465mm
LCCSA 149.0375 1006mm 1258mm 503mm
Averaging out the 3 on ¼ wave = 503-491=12mm / 2 = 6mm = 491+6 = 497
SWR will be fine across all of them then.
However, please keep in mind that the HAM radios really don’t like that 160+ frequency range. Drops power output down to single digit watts
The two lower ones are better for range and power.
ta
A.H. (Eric) Sommer | zr6...@gmail.com | +27 82 492 9272 | (Fax )+27 86 530 6642 | ZR6ETR (gTalk)
Heine De Villiers
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Eric (A.H.) Sommer
>> So let's forget the top one then and trim to 497 on 1/4 wave ?
Yup – carry a spare whip for that one that is perfectly tuned – the radio will battle enough as it is.
Heine De Villiers
Ta
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