#81 Shop Talk Homebrew Test Gear PT 2

[The Radio Shop]

In this video we throw a QRP microvolt wattmeter together out of junk parts.
This meter has two ranges. 0-1 and 0-10 watt settings.



https://www.youtube.com/watch?v=dDxoCLcdT4I

[The Radio Shop]

Schematic

[The Radio Shop]

Here is a pic of the finished product.

[AB5NI]

Wonderful use of the Dosy meter, Buddy! I don't know if this is true, but I hear that that particular meter (the circuitry) is not too accurate.

I have the perfect dummy-load to go along with it, if you or anyone else is interested. Here's what you need:

• An old, glass baby-food jar with a metal lid
• An SO-239 or BNC connector
• Some mineral oil
• 2 100-ohm, 3-watt resistors in parallel
• A short run of 50-ohm coax

FIrst, take the lid off the baby-food jar, and then punch out (or drill out) the center of the lid so it can accept your desired connector.
Mount the connector to the lid, with the female portion of the connector on the top of the lid. This is where you'll screw in your coax.
Next, solder the coax to the center/positive connection on the connector, attach the ground of the coax to the lid/connector, and then
solder the other end of the coax to both sides to two paralleled, 100-ohm resistors, making sure that the parallel resistors wind up
centered inside the baby-food jar. Fill up the jar with mineral oil, and then insert the coax and resistors into the mineral oil and screw
down the lid.

When done, what you'll have is a baby Heathkit "cantenna" that should be able to handle around 10-15 Watts or so, but don't push the thing
too hard or you'll wind up letting out the magic smoke .

73,

Randy AB5NI

[AB5NI]

BTW, it is also important to note here that this wattmeter is a piece of test gear and meant to be used with a dummload, folks. Please don't try
to use this as a station wattmeter while transmitting on air. Your end results will not be kind, especially if you are trying to run a rig in the
milliwatt range. For those who wonder why this is so, it is a direct-sampling wattmeter, tied directly to the center conductor. It is robbing a
large portion of the RF to drive the meter circuit; moreover, it is changing the input and output impedance, and it will no longer be 50 ohms.
You could probably get away with it by using an antenna coupler on the output, but the direct sampling and the tuner will rob too much power
for QRPp operation. I guess you could get away with using it with a few watts of power, but I'm not sure I'd try using it that way either.

73,

Randy AB5NI

[The Radio Shop]

Hi Randy,
Yep those meters are not the best. Seldom seen two that would read the same. Thought the best thing to do was give it a transplant
Thanks for the dummy load example. I made a small salt water dummy load before.

[AB5NI]

Yo, Buddy!

Great use of the "DOSY-DOH!" meter movement, my friend! I'll be on the lookout for one for sure. Should be a wonderful addition to my test gear. BTW, if you keep this up, I'll wind up having projects that go well beyond the winter months .

73,

Randy AB5NI

[The Radio Shop]

Thanks Randy. I like sharing stuff when I can. Projects are always fun. Plus got to do something all winter lol.

[RJ]

Great stuff guys!

[Stevenkn]

Owen Cole from Baton Rouge was looking for desalination process engineer resume
 
Griffin Murray found the answer to a search query desalination process engineer resume
 
 
ESSAYERUDITE.COM
 
 

 
 
desalination process engineer resume
 
 
 
 
 
 
 
 
 
 
tips for creating an effective resume
essay questions on the raven
descriptive essay writers services
esl dissertation introduction writing websites online
professional bibliography writer service online
cooling towers the thesis
sample resume for surgical tech
professional scholarship essay ghostwriters services usa
write me engineering annotated bibliography
essays on frankenstein theme
popular reflective essay ghostwriter website ca
sales and inventory system thesis documentation sample
cry out and write a feminine poetics of revelation
resume samples administrative assistant
pay for professional critical analysis essay on civil war
how to make a resume for dialysis technician
resume c north carolina
top rhetorical analysis essay ghostwriters service
how to write a visit report
esl biography writing website us
my dog did my homework book
thesis sampling design
a paper for school
most common ap euro essay topics
emory essay prompt
twelfth night essay full auth3 filmbay yniii nw html
best dissertation chapter editing for hire uk
professional research proposal writing for hire for school
cover letter for accounts receivable clerk
buy u.s. history and government personal statement
apa research paper guide
ib world literature essays
order sociology dissertation proposal
esl thesis proposal ghostwriting websites ca
top critical analysis essay editing site us
economics research assistant resume
hr recruitment resume examples
emerson thoreau essay
popular ghostwriting service for masters
best annotated bibliography editor websites gb
an occurrence at owl creek bridge thesis
top critical thinking writer website for university
resume cover letter for construction project manager
how to write a good paragraph
pay for university essay on hillary clinton
cheap best essay writer for hire for phd
leadership essay writing
top application letter editing service for masters
solids liquids and gases homework
fashion buying dissertation topics
literary analysis paper guidelines
essay on nathaniel hawthorne free
overall equipment effectiveness thesis
conservation essays
critical thinking ghostwriter
essay on fad dieting
book report letter to author
sample resume for accountant graduate
thesis on robotics
esl masters essay ghostwriting for hire
work objective resume
radio show business plan
damn good resume book
resume grant writer
tufts sample college essays
custom best essay ghostwriter site gb
how to write in gothic calligraphy
popular persuasive essay writing sites for college
business plan editor website au
top masters school essay topics
best research paper editor services us
argumentative essay anti-gun control
how to write business logic
esl masters essay editing site for school
research paper senior theme
the essay is goodfor the spelling mistakes
treat animals humanely essay
essay on my favourite subject computer
obama administration resume
soul mate definition essay
cheap rhetorical analysis essay writers sites gb
esl school resume examples
essay people's mentality
marjorie failoni resume
core java developer resume sample
google file system research paper
essay titles against death penalty
banking sample cover letter
essay on strength and weakness
critical ghostwriter website online
argumentative essay examples university
popular thesis proposal ghostwriters site for mba
classical liberalism essay
esl argumentative essay ghostwriter websites for masters
definitions essay writing
qualifications for resume samples
 
how to write a weather report
review of research paper format
essay on modern technology in education
critical analysis ghostwriting websites au
writing a research paper lesson plans
save german essay
top book review editing services for phd
collecting data literature review