A number of years ago, I bought a dummy load kit, I think it was at the
Texas City Hamfest. It was supposed to consist of a mason jar, an
SO-239, a couple of what look like galvanized steel disks that looks
like they were perforated with a nail, some wire to hook the SO-239 to
the disks, and 20 1K 3W resistors. I started building it, and after I'd
been attaching resistors to it for a while, I discovered that I didn't
run out as fast as I'd expected to, and that I ran out of holes before I
ran out of resistors. I counted the resistors I had and It seems that
the fellow gave me 50 (or more! I actually don't remember how many)
resistors instead of the expected 20.
Now, I'd recommend doing a kind of a star arrangement than using solid
metal disks or a loop, but I happen to have all these resistors lying
about. They're more than I'm likely to need any time soon, so does
anybody want any of them?
As an aside, I modified the kit to include an AM detector and RF
sampler and my mason jar is filled with food-grade mineral oil because I
couldn't find any transformer oil that didn't come inside a
transformer. I also replaced the SO-239 with BNC connectors because I
already had a dummy load with an SO-239 on it. I figure it's good for
100 watts or so more or less continuously or quite a bit more than that
in short bursts.
On 4/12/2019 5:05 PM, john Parmalee via BVARC wrote:
This is realty two projects in one, A RF volt meter that squares the
voltage, divides by 50 and displays it as Watts. The second is
something that has been around for a while called a CanTenna. They can
be built in the quart or gallon size. I guess you could build it in a
five gallon paint bucket. I suggest for a higher power unit more
individual resistors be used so long as the total parallel resistors
equal 50 ohms. You could also put the quart unit in a bucket of Ice
water but there is a limit to how fast the heat can get away from the
resistors.
As for the volt meter I suggest the D-1, C-1, R1 & R2 could be
mounted in a piece of metal tube with a coax connector or on the RF
end and some of coax with another connector into the meter box. A
tee connector would allow the meter to work in an antenna line,
between transceiver and power amp or where ever else. Also by
changing the ratio of r,1 & R-2 the range could be changed.
It might be fun to build!
John Parmalee
jparma...@aol.com <mailto:jparma...@aol.com>
281-380-3811
K5VGM WI2XLJ
In a message dated 4/12/2019 11:39:29 AM Central Standard Time,
bvarc@bvarc.org writes:
I may tackle the WATTMETER/DUMMY mentioned last night, NOV
QST. Looks easy, includes a display, and would be useful…150 or
even 200 watts for a short time… and about $20 for the parts.
I thought last night’s meeting was very good…. we have some good
guys running BVARC!
David K5HEC
On Apr 12, 2019, at 9:12 AM, Roy Storey via BVARC
<bvarc@bvarc.org <mailto:bvarc@bvarc.org>> wrote:
Here is another project for those (and any one else) who
attended the club meeting last night.
Click or copy and paste this link into your browser. This uses
the Uno board but it has the same pinout as the Nano.
https://create.arduino.cc/projecthub/SBR/working-with-two-leds-d95b11?utm_campaign=new_projects&utm_content=2&utm_medium=email&utm_source=hackster&utm_term=project_name
Roy W5TKZ -- 73
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Radio,Radio,Radio We are a radio Club!
Talk it up! On the air about every event, every meeting, every net, every time,
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_______________________________________________
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Radio,Radio,Radio We are a radio Club!
Talk it up! On the air about every event, every meeting, every net, every time,
talk about the club, ham fests, events and people.
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