NS-40 Class E Transmitter


[4SQRP] New Four State Kit Announcement
Jay Bromley jayw5jay at cox.net
Fri Dec 26 20:35:39 PST 2008


HI Guys,

I had the privilege of building the NS-40 and the first contact was Terry, WA0ITP! The frequency is a little low, 7.027.911. Really I like being off 7.030 a little as there are some QRQ QRO kinda guys most of the time on 7.030. A QRP signal usually just gets stoomped on. The only problem I had during our QSO was going across the room to throw the antenna switch in between transmissions. Oh well I need all the exercise I can get! :-)

I powered up the NS-40 via my MicroKeyer II power line with 13.8 volts and at times I got over 10 watts out! However during my QSO with Terry it stayed at 7.5 watts on LP-100A power meter. The SWR was 1.02 into my ladder line fed inverted Delta Loop. While looking at the NS-40 on the scope and probing around I would leave it keyed for a long time and the IFR 510 stayed cool to the touch! Speaking of which the waveforms look spectacular, they seemed to have really done their homework on this transmitter. For no winding toroids the kit sure puts out full QRP power and them some.

Terry knows I have been interested in Class E for a long time, mainly on AM. This kit let's you get into Class E for just a modest investment and has to be by far one of the neatest kits I have built in a long time. I spent more time letting Kathy shoot some pictures while I was building it. Build time was a lazy 40 minutes. The extra 20 minutes was spent taking time out for dinner, hi. Also I had to dig up a power and key jack that took 5-10 minutes.

You can see the manual and schematic below, but if you would like to see pictures of my build let me know and I will send you a set of low resolution jobs.

There is a neat place on the back for QSLing. Terry's call is going on the bottom of my transmitter with our QSO information. This would make a great gift for an Elmer that was kind to you and be their first contact. Maybe a NS-40 to NS-40 QSO would be in order? This transmitter would also make a great group build!!

To slick this little unit up further I am planning on a keying buffer so I can use my Cmos III. I made a socket for the crystal so I am not stuck on 7.030 only and now I can move around a bit with other crystals I have on hand. Maybe I will add a nice jack for RF output.

These will not last long guys, so don't snooze on this deal!

73 de jay/w5jay..