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Reviews Categories | QRP Radios (5 watts or less) | NS-40 Class E Transmitter by NM0S Help


Reviews Summary for NS-40 Class E Transmitter by NM0S
NS-40 Class E Transmitter by NM0S Reviews: 12 Average rating: 4.8/5 MSRP: $30 (DX $33)
Description: Kit designed by David Cripe NM0S, and made available by 4SQRP Group. The NS-40 Transmitter is an upgraded version of the overall winner in the FDIM 2008 Homebrew Contest. It is a truly unique QRP transmitter design. NS stands for No Simpler, so this is the No Simpler 40 Meter Transmiter.
Product is in production.
More info: http://www.wa0dx.org/wa0itp/ns40.html
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IZ4KBS Rating: 5/5 Sep 29, 2010 09:15 Send this review to a friend
Just one word: great!  Time owned: 0 to 3 months
Beside being an innovative design, this barebones kit works extremely well. I have completed the basic kit in maybe one hour, and then spent another few hours to put it in a nice enclosure and add a crude VXO, for a bit more frequency agility at the price of some drifting during warm-up. Not a problem though, because after the first few minutes the unit stabilizes, and being able to sweep a bit around the band greatly increases the chance of making plenty QSOs. Currently mine covers the 7022.71-7025.49 KHz range, plenty enough for a lot of QRP fun! Pwr is about 8 watts, quite stable over the whole span. Look here to get a feeling: http://www.strozzi.it/users/carlo/hamradio/ns-40/
 
AB9EI Rating: 5/5 Feb 9, 2009 10:51 Send this review to a friend
Brilliant, innovative design!  Time owned: 0 to 3 months
What an innovative kit! The simplicity of it, from a kit-builder’s point of view, is simply brilliant. I discussed the NS-40 design (inductors etched into the PC board - no toroids to wind) with my weekly HF CATS (“Chatter and Talking Society”) net, and it definitely piqued their curiosity. I am getting about 9-10 watts out at 13.8VDC input, and find the transmit frequency with the 7.30 crystal to be about 7.28 (not a problem). It definitely runs cool, even at 9 watts out. I have inserted two SIP sockets in the board so that the crystals (7.30, 7.40, 7.128 – actual transmit frequency varies by about 20KHz) can be easily swapped. My first contact was with a western NC station. He gave me a 599 – not bad, considering I’m in the Chicago area! I think that this would be an especially rewarding build for a first time kit builder.

My compliments and thanks to David Cripe, NM0S and to the 4SQRP Group for all of the hard work that went into making this kit available.
 
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