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QRPp power meter
Does anyone have a ny designs for a (low) power meter that would read powers
of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB |
"A Simple and Accurate QRP Directional Wattmeter", in Feb. 1990 QST fits
the description. It also appeared in several ARRL Handbook editions shortly after the QST article was published, and in some reprint publications like ARRL's _QRP Classics_. Roy Lewallen, W7EL Richard wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB |
"A Simple and Accurate QRP Directional Wattmeter", in Feb. 1990 QST fits
the description. It also appeared in several ARRL Handbook editions shortly after the QST article was published, and in some reprint publications like ARRL's _QRP Classics_. Roy Lewallen, W7EL Richard wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB |
Richard wrote:
Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Check this out: http://www.webx.dk/oz2cpu/radios/miliwatt.htm It is based on Analog Devices' AD8307 chip. You can skip the PIC part if you have a reliable DVM! Happy Easter, if applicable Paolo ik1zyw |
Richard wrote:
Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Check this out: http://www.webx.dk/oz2cpu/radios/miliwatt.htm It is based on Analog Devices' AD8307 chip. You can skip the PIC part if you have a reliable DVM! Happy Easter, if applicable Paolo ik1zyw |
Behold, PaoloC signalled from keyed 4-1000A filament:
Richard wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Check this out: http://www.webx.dk/oz2cpu/radios/miliwatt.htm It is based on Analog Devices' AD8307 chip. You can skip the PIC part if you have a reliable DVM! Happy Easter, if applicable Paolo ik1zyw Oh, that is just too sweet! :)))))))))) -- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
Behold, PaoloC signalled from keyed 4-1000A filament:
Richard wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Check this out: http://www.webx.dk/oz2cpu/radios/miliwatt.htm It is based on Analog Devices' AD8307 chip. You can skip the PIC part if you have a reliable DVM! Happy Easter, if applicable Paolo ik1zyw Oh, that is just too sweet! :)))))))))) -- Gregg *It's probably useful, even if it can't be SPICE'd* http://geek.scorpiorising.ca |
In article , "Richard"
wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB Some tips power and swr: http://www.njqrp.org/ghbextra/3/3i.html Good in practise japanese (dont need to read): http://www.geocities.jp/ja6hic/soku/swr/swr.html http://www.qsl.net/mnqrp/swr.htm http://www.g4wif.fsnet.co.uk/q_tech15.htm With led-indicator: http://ua70.faithweb.com/cgi-bin/i/minipig/qrp-tune.jpg /Per-Ake -- Remove "extra" in my e-mail adress !! |
In article , "Richard"
wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB Some tips power and swr: http://www.njqrp.org/ghbextra/3/3i.html Good in practise japanese (dont need to read): http://www.geocities.jp/ja6hic/soku/swr/swr.html http://www.qsl.net/mnqrp/swr.htm http://www.g4wif.fsnet.co.uk/q_tech15.htm With led-indicator: http://ua70.faithweb.com/cgi-bin/i/minipig/qrp-tune.jpg /Per-Ake -- Remove "extra" in my e-mail adress !! |
"PaoloC" wrote in message ... Richard wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Check this out: http://www.webx.dk/oz2cpu/radios/miliwatt.htm It is based on Analog Devices' AD8307 chip. You can skip the PIC part if you have a reliable DVM! A nice chip the AD8307, very easy to use. I used one as the logarithmic amplifier stage in my spectrum analyser. It's available at Farnell http://www.farnell.com in 8-pin DIL, which is another nice thing for a relatively new IC. Expensive though, and of all the chips I could've fried when constructing my analyser, I had to fry that most expensive one and get a replacement. I guess to do otherwise would probably be in violation of Murphy's law, or Sod's law or someone's. 73 de Hans G0UPL http://www.HansSummers.com |
"PaoloC" wrote in message ... Richard wrote: Does anyone have a ny designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Check this out: http://www.webx.dk/oz2cpu/radios/miliwatt.htm It is based on Analog Devices' AD8307 chip. You can skip the PIC part if you have a reliable DVM! A nice chip the AD8307, very easy to use. I used one as the logarithmic amplifier stage in my spectrum analyser. It's available at Farnell http://www.farnell.com in 8-pin DIL, which is another nice thing for a relatively new IC. Expensive though, and of all the chips I could've fried when constructing my analyser, I had to fry that most expensive one and get a replacement. I guess to do otherwise would probably be in violation of Murphy's law, or Sod's law or someone's. 73 de Hans G0UPL http://www.HansSummers.com |
"Richard" writes:
Does anyone have any designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? I don't know what your intended use is, but if you just want to measure output power while testing a transmitter, what about just measuring the voltage across your dummy load, since, for the same resistor, power is proportional to voltage squared? (It may take a bit of work/ingenuity to measure RF voltage at six meters, but that's one of the things that being a ham is all about.) --Myron, W0PBV. -- Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) |
"Richard" writes:
Does anyone have any designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? I don't know what your intended use is, but if you just want to measure output power while testing a transmitter, what about just measuring the voltage across your dummy load, since, for the same resistor, power is proportional to voltage squared? (It may take a bit of work/ingenuity to measure RF voltage at six meters, but that's one of the things that being a ham is all about.) --Myron, W0PBV. -- Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448 NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol) |
"Richard" wrote in message ... Does anyone have any designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB Oak Hills Research Has a real nice little meter, http://www.ohr.com/wattmeter.htm Richard WB8KRN |
"Richard" wrote in message ... Does anyone have any designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB Oak Hills Research Has a real nice little meter, http://www.ohr.com/wattmeter.htm Richard WB8KRN |
I have a schematic of a device I built for testing and servicing. While mine
isn't designed to read in watts or milliwatts, it does detect the smallest amount of RF . There is a pot on it to adjust sensitivity. I'm sure it could be adapted somehow for your needs. Knowing my repairs and such, I'm going to say 3-5 watts pegs the meter. So, as I said, you can scale it back or design the thing to work for you. Cost is about $10 IF you have to buy any thing. It can be made from junk box parts and a spare case from a scrapped piece of equipment or housing from the shack - or just about anything. If interested, e-mail me for info. Lou -- Clearing out shop, shack and house. I have a list of things for sale. NOS/New/Used, Parts, radio accessories, etc. All are AS IS. Interested? E-Mail me. "Richard Heindel" wrote in message ... "Richard" wrote in message ... Does anyone have any designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB Oak Hills Research Has a real nice little meter, http://www.ohr.com/wattmeter.htm Richard WB8KRN |
I have a schematic of a device I built for testing and servicing. While mine
isn't designed to read in watts or milliwatts, it does detect the smallest amount of RF . There is a pot on it to adjust sensitivity. I'm sure it could be adapted somehow for your needs. Knowing my repairs and such, I'm going to say 3-5 watts pegs the meter. So, as I said, you can scale it back or design the thing to work for you. Cost is about $10 IF you have to buy any thing. It can be made from junk box parts and a spare case from a scrapped piece of equipment or housing from the shack - or just about anything. If interested, e-mail me for info. Lou -- Clearing out shop, shack and house. I have a list of things for sale. NOS/New/Used, Parts, radio accessories, etc. All are AS IS. Interested? E-Mail me. "Richard Heindel" wrote in message ... "Richard" wrote in message ... Does anyone have any designs for a (low) power meter that would read powers of up to 1w (down to say 50mw or even lower) up to and inc. 6m? Rgds Richard SO5GB Oak Hills Research Has a real nice little meter, http://www.ohr.com/wattmeter.htm Richard WB8KRN |
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