Hello all,
I'm a new guy to the AM Radio list, my Name is Scott, my friends call me
Bow
(like bow and arrow).
I am located on the northwest side Houston, TX and I like to homebrew.
I have built quite a few tube guitar amps and such from scratch, and now I
am interested in cooking up an AM transmitter to get on the air... Tubes,
of
course. :)
I recently acquired some 815s and 807W tubes (2 each) that I would like to
put to use.
Until I get my homebrew project started, I will be putting my Knight T60
on
the air, just to try it out. I am currently waiting for the DDS VFO kit
that
I ordered to come in, as that will be the VFO I use for the T60, as will
as
other transmitter projects.
I have a EF Johnson Messenger Two 11 meter rig that I will be putting on
the
10 Meter AM band as well, when 10 meters opens up again.
I also have a Icom IC-718 that is on the air now.
I hope to catch you on the bands.
Bow
W5EFR
Bow,
I think I used to live not too far from your QTH back in the late 70's. I
lived in the Heights area of Houston, near the intersection of W 24th Street
and Rutland (Ave?}.
The 815 is a pair of 807's in one envelope. If yours is good, you could run
about 100 watts plate modulated with it, or use it as a modulator tube and
get enough audio power to modulate a 100 watt carrier. I had never heard
that about the 815, but many of those tubes with multiple seals in the
envelope are notorious for taking in air as they remain on the shelf for
many years.
What kind of DDS VFO kit did you order? Several years ago I picked up a DDS
vfo at Dayton. It was made by S&S Engineering (if I recall the name
correctly). It tunes up to 16 mHz, but I used it @ 7 mHz and multiplied up
with an old Eico 720 to work 10m, and it seemed to have near perfect
stability.
I used it with the recent ARRL frequency measuring test, and managed to
measure one of the frequencies (80m) within 0.5 Hz. So if yours has clean
output, free of spurs, it would make an excellent vfo for AM or any other
mode, for that matter.
You ought to try to get in touch with John, WA5BXO and Otis, K5SWK. They
now live somewhere north of Houston, near Conroe I believe. They have been
tall ships on AM from the Houston area for decades, and could probably help
you.
BTW, does anyone in the Houston area know what ever happened to the museum
and collection of pre-WW2 radio publications that used to be in the building
that housed the Houston amateur radio club in the late 70's? They had a
their own building and meetings were held on Friday nights, once a month as
I recall. Part of the meeting was an auction that alternated between "good
equipment" and junk parts. Some of the museum stuff was extremely
interesting, and would be highly sought after to-day, and the publications,
mostly broadcast related technical magazines from the late 20's throughout
the 30's contained a lot of hard to find technical data and history of
radio. They had some framed photographs of club meetings before WW2, and I
recall one picture listed the members, and one of the members present in the
photograph was Howard Hughes in his younger years.
I understand that the part of Houston where that building was located
flooded out during a hurricane a few years after I left. I would hope that
all that history didn't get destroyed in the flood. Someone told me that
the Houston amateur radio club disbanded in the 80's.
Don k4kyv
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