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Hello to all on the forum
There is a lot of information on the internet reference resonant and non-resonant wire antennas and their lengths, feedpoint transformers etc. But nearly all this information is aimed specifically at the amateur radio user and their hf bands
As a utility monitor, I am trying to gather as much information as possible to build a passive antenna which is best suited for monitoring the utility bands.
My areas of interest are the hf marine and aviation bands especially the 4, 5 and 8MHz bands.
I already have a Wellbrook ALA100 and it serves its purpose, but I'm looking for a passive alternative to try at my QTH which is fairly quiet.
The ideas I have are:
33ft vertical fed by an appropriate transformer (9:1,16:1, 32:1)
End fed inverted-L at a given length that is suitable for these bands fed with either a 9:1, 49:1 or 64:1 transformer
Unfortunately, a dipole is not suitable at my location due structural issues.
One of my main questions are the specific length of the end fed inverted-L for the utility bands. Do I go for length that is resonant on the ham bands to make it non-resonant on the utility bands?
And what ratio transformer would be suitable for the 33ft vertical?
Your help is very much appreciated
There is a lot of information on the internet reference resonant and non-resonant wire antennas and their lengths, feedpoint transformers etc. But nearly all this information is aimed specifically at the amateur radio user and their hf bands
As a utility monitor, I am trying to gather as much information as possible to build a passive antenna which is best suited for monitoring the utility bands.
My areas of interest are the hf marine and aviation bands especially the 4, 5 and 8MHz bands.
I already have a Wellbrook ALA100 and it serves its purpose, but I'm looking for a passive alternative to try at my QTH which is fairly quiet.
The ideas I have are:
33ft vertical fed by an appropriate transformer (9:1,16:1, 32:1)
End fed inverted-L at a given length that is suitable for these bands fed with either a 9:1, 49:1 or 64:1 transformer
Unfortunately, a dipole is not suitable at my location due structural issues.
One of my main questions are the specific length of the end fed inverted-L for the utility bands. Do I go for length that is resonant on the ham bands to make it non-resonant on the utility bands?
And what ratio transformer would be suitable for the 33ft vertical?
Your help is very much appreciated