As SWR came up in one of the threads, while searching for the Twin-Lamp SWR indicator I found this interesting article regarding the history of SWR.
As SWR came up in one of the threads, while searching for the Twin-Lamp SWR indicator I found this interesting article regarding the history of SWR.
Although most of this applies to higher power Amateur stations, the basic theory still applies.
A bit long, 12 pages, but humorously educational.
Here is a LINK TO THE ARTICLE. Enjoy...
A great find mram! And there could be something there that might trigger an idea or two for the flea vswr meter.
Time to put on the experimenter hat and break out the discovery tools! 😉
RFB
That is some kind of a link MRAM 1500.
I read it sitting down, but I'll stand and wave for such good reading.
Hi Guys since I brought up the SWR meter.
Here is a power meter and SWR meter that reads from 5 mw to 100mw.
It a great little meter.
http://www.ohr.com/wattmeter.htm
I really hope this could help people out with setting up a station.
SKW40
Its amazing how a meter can cost more than the transmitter itself...
But it looks like it could be useful.
Because of the stated use of the meter it is reasonable to assume that its input is 50-ohms, which would make it useless for the average part 15 AM transmitter, but I couldn't find a spec sheet for the meter.
Could the input to such a meter not be changed to match the 30pF + 30-ohm "dummy load" we are discussing (in the neighbor thread on test standards)?
Standard for which transmitter's output configuration? They are NOT all the same, thus it would be difficult to find a "standard" with transmitters designed with different outputs and impedance networks.
RFB
Hi Guys
The meter has a 50 ohm impedance.
So you would have to have a transmitter like the AMT 3000,or the RAMSEY AM25,
or a Talking Sign Transmitter
Which all have a 50 ohm output. i am not sure what other transmitters
hoave a 50 ohm output,but these 3 do.
So this meter would work great on the above transmitters.
Thanks
SKW40