I cannot find any cut and dry info on building a 3 element yagi between channels 12 and 13 Hi VHF TV 210mhz 12db band witdth.
I get all the basics and then confusion on all the rest.
Metal boom - pvc boom - wood boom ??
I want to use a 1" square boom from an old TV antenna. I have the elements and the insulators for them.
I want to feed my coax into a 75 ohm transformer which is 300 ohms at the driven element.
Do not need a folded dipole at that frequency. I have the info that the reflector is 5% longer and the directors are 5% shorter.
I also have dimensions for the complete antenna with the spacing. However it is for a wooden boom with the elements raised off of it.
In the ARRL hand book it gives a lot of info but it is also not cut and dry.
Wade makes single band antennas. If I could find there dimensions for the channel 12 and the channel 13 yagi.
Then just build one using the difference between them. I need the bandwidth to be very tight only the 12 db with a drastic cut off on each side.
I do get major interference every so often it actually kills the TC signals for both 12 and 13 so sometimes no reception at all.
I have tried VHF filters. The do help but I need something far better to clean out the interference.
I have tried a 7-13 yagi with no help on the problem.
Any suggestions?
I get all the basics and then confusion on all the rest.
Metal boom - pvc boom - wood boom ??
I want to use a 1" square boom from an old TV antenna. I have the elements and the insulators for them.
I want to feed my coax into a 75 ohm transformer which is 300 ohms at the driven element.
Do not need a folded dipole at that frequency. I have the info that the reflector is 5% longer and the directors are 5% shorter.
I also have dimensions for the complete antenna with the spacing. However it is for a wooden boom with the elements raised off of it.
In the ARRL hand book it gives a lot of info but it is also not cut and dry.
Wade makes single band antennas. If I could find there dimensions for the channel 12 and the channel 13 yagi.
Then just build one using the difference between them. I need the bandwidth to be very tight only the 12 db with a drastic cut off on each side.
I do get major interference every so often it actually kills the TC signals for both 12 and 13 so sometimes no reception at all.
I have tried VHF filters. The do help but I need something far better to clean out the interference.
I have tried a 7-13 yagi with no help on the problem.
Any suggestions?