Chris,
I have held QSOs from Columbus, GA to Atlanta on 75 mtrs during the
daytime with an improperly grounded dummy load.
You may be REALLY surprised how far you CAN really transmit with
such things. It ALL boils down to the CURRENT conditions.
Bob - N0DGN
CHRIS PAPAIOANNOU wrote:
Jim,
I don't think that this bulb dummy load radiated RF far away...but
sufficiently far away to provoke the neighbors around to start coming by...a
test once proved me that with a dummy load my modulation has been heard no
more than about 195 feet.Didn't check out if this distance was more than 195
feet because an other fellow ham who was in his house heard me and this test
ended at this point,because this was the object.But since i believe that
antennas with regular electrical length depending of the frequency are
exactly the opposite of a dummy load i guess that this distance couldn't
be a little bit more than these 195 feet.
Regarding that Lear T30 seems that the aluminium window frame was a very
poor counterpoise..did you use at that time any form of rf ground?
I've experienced in the past TVi problems with tube AM rigs due to poor rf
grounds..you can immagine my ma's face when was coming to tell me that was
listening to a strange voice in the tv,something like cat's mew.Then learned
that this was me.
Fortunatelly i never had problems with the neighbors.Generally these
transmissions were midnight transmissions when the most of them were on bed.
FM?My 1st homebrew rig was a 6BQ5 rig.Self oscillated (COLPITS type).I was
using an FM receiver when trying to tune it.Had homebrewd a 6AK5(5654W) self
oscillated also.With dipoles on the roof made from aluminium pipe.I remember
that had connected 2 transfrmrs with primaries 220V and secondaries 6,3V/2A
secondary to secondary in order to feed the rigs.In this way had no
confluences beetween rf and feeding and no hum.
Vinyl?I don't need to remember it Jim cause even now i still use my old
records..The others here are using digi media.I don't.My amp and tuner are
tube type also.By the others i mean the members of my family.
I really enjoyed your memories and experiences Jim,
Regards,
Chris,SV1DAF.
--
< Bob Bethman - N0DGN
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| N0DGN AMRadio Manassas, VA | REAL Tube Radio and AM |
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