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Author Topic: What is Definition of SSB QRP?  (Read 450 times)
AB8IF
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Posts: 22




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« on: July 28, 2014, 12:32:02 PM »

I am finishing a homebrew sideband transmitter...

http://s1142.photobucket.com/user/126gliderpilot/media/Double%20Sideband%20Transmitter/ConstructionFinished_zps50e3904e.jpg.html?sort=3&o=10

It has a P.E.P. of 20 watts so I'd expect the average power output with voice modulation to be around 5 watts. Would it qualify as a QRP rig?

Roger
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KA4POL
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Posts: 1924




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« Reply #1 on: July 28, 2014, 10:01:30 PM »

In SSB the average actually may be in the range of 10 to 20 % of PEP. The factor 4 comes from AM.

See also http://www.arrl.org/qrp-more-than-a-state-of-mind
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G4AON
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Posts: 518




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« Reply #2 on: Yesterday at 12:49:57 AM »

The Q code means "decrease transmitter power". However, for CW the accepted power level for QRP contests is often 5 Watts output or less. The power on SSB is less clear, some suggest 10W PEP and others 5W PEP.

20W PEP isn't QRP, nor is trying to convert it to average power.

73 Dave
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N7EKU
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Posts: 50




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« Reply #3 on: Yesterday at 01:17:31 AM »

Hi Rodger,

Very nice looking work!  Very organized and clean!

Hmm, since you are DSB, that's 10W on each SB so maybe you are OK hihi!  Probably for contests you would have to ask what they think...

Anyway, what are you using for your PA transistor and what is your Vcc on it?

Cheers and 73,


Mark.
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KB1WSY
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Posts: 684




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« Reply #4 on: Yesterday at 01:46:48 AM »

Beautiful work!

73 de Martin, KB1WSY
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DL8OV
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Posts: 58




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« Reply #5 on: Yesterday at 03:55:07 AM »

Nice work!

I have always understood that for QRP operation I should see 5W CW or 10W SSB on my peak hold power meter. Having said that, if you go on air with 20W and call CQ QRP I don't think that you will hear any objections, the stop bulb on my car is 20W.

Peter DL8OV
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AB8IF
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Posts: 22




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« Reply #6 on: Yesterday at 08:13:26 AM »

Hi Rodger,

Very nice looking work!  Very organized and clean!

Hmm, since you are DSB, that's 10W on each SB so maybe you are OK hihi!  Probably for contests you would have to ask what they think...

Anyway, what are you using for your PA transistor and what is your Vcc on it?

Cheers and 73,


Mark.


Thank you Mark!
PA is an IRF510, Vcc = 24V

Roger
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AB8IF
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Posts: 22




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« Reply #7 on: Yesterday at 08:16:25 AM »

Thank you for your input gentlemen!
Looks like a Philadelphia lawyer will be needed to settle this one  Wink... but that's getting too serious!
73, AB8IF Roger
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