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Post by bluebucketradio on Feb 25, 2016 0:43:33 GMT
I was trying to remember the type of antenna that is pictured on your website with the caption "this is not our antenna"
Years ago i was browsing the pirate radio websites and forums, someone built the antenna something like what is pictured on your website but without knowing what it is called i keep hitting brick walls. This guy runs a shortwave transmitter and an AM transmitter under part 15 rules. For his AM it was three wires on each side of what looks like a dipole with the wires coming together in the middle to the feed line and he used pvc water line as insulators on each end. He managed to keep it just under 3 meters.
Thanks ahead of time.
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Post by Admin on Feb 25, 2016 4:47:01 GMT
As I recall that picture is a post card of a US Naval Coastal station from the '20's or '30's. I'm not really sure what type of antenna that is. Most likely it's just a top loaded vertical. Sometimes they were called "flat-top" antennas. I don't think they were using dipole antennas at that time. Here is a link to some info about the flat-top or vertical "T" antenna. The picture looks very similar to the one on my page. The T-Antenna |
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Post by bluebucketradio on Feb 25, 2016 19:32:14 GMT
Bob,
That is what i thought it was called, a T-antenna but for some odd reason my head was telling me different.
I still cannot find the article and can only assume it had been lost to internet goblins. I am thinking that type of antenna could be applied to the shortwave band at 22 meters 13.560 and possibly on longwave as well.
There are plans all over the interwebs for this antenna, most of which were applied to the HF band for Ham radio.
I really wanted to try this on the AM but from the looks of it, i will have to wing it.
Thank you for the response Bob.
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Post by Admin on Feb 25, 2016 20:03:03 GMT
Yes, the T or Flat top antenna is probably more suited for the Longwave band than shortwave. Maybe the 160 or 80 meter bands but shorter wave length antennas can work very well without the top loading. In the early days of radio they operated at very low frequencies and just like we try to improve our physically short AM BCB antennas with top hats, the longwave antenna utilized top loading to improve efficiency. There is also the "fan" antenna which is a multi-band dipole with a single feedpoint. Basically, multiple dipole antennas are strung from the same support structure and the center feedpoint is common to all of the dipoles. Perhaps he was using something like that. Here's a link to info about THE FAN ANTENNAThis would be suitable for multiple shortwave bands to include the 13.560 MHz range. |
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