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 51 
 on: Yesterday at 04:54:09 PM 
Started by KE8HAG - Last post by W4KYR
Geez I hope THIS thread doesn't get closed like all the others....

 52 
 on: Yesterday at 04:51:11 PM 
Started by K8AXW - Last post by KJ4DHI
I have been exclusively cw/qrp on 20. I want to be on 40 also. My antenna is a 33ft longwire. I am told that even with a tuner it will not work on 40. Yes, no, maybe so?

 53 
 on: Yesterday at 04:41:02 PM 
Started by K3ZD - Last post by JS6TMW
Those little $7 worm gear motors are amazing for torque. You can get them down to 3 rpm from eBay sellers (at 3 volts), which is a good speed for turning a regular air variable.

I'm now using an even smaller and lighter 15 rpm gear motor, not worm drive, with a lead screw to tune a piston-type capacitor. I don't use a controller, just a reversing switch on the battery pack. I made the leadscrew so that it can't overrun the ends. I only use the CW portion of 40 meters so the tuning range is about 2 centimeters of leadscrew from 6980-7200 kHz, with a tuning rate of 100 kHz per minute.

Steve in Okinawa

 54 
 on: Yesterday at 04:39:02 PM 
Started by G4AON - Last post by W9FIB
I think for the kit builder it's not about saving money, it's about building the kit. It must cost more to bag kit parts than to stuff and solder a board by machine.

But, but it seems like if I'm building it myself then there should be some cost savings.

That's why it is a free market and you can spend your money any way you want.

The economics are simple, price too high and get no sales, your not going to last long. But on the other hand, if it is like WI, you pay a very small fee to the state each year and a corporation can live forever...sales or not.

 55 
 on: Yesterday at 04:28:46 PM 
Started by W2MV - Last post by W2MV
I walked around the neighborhood with a portable receiver and a National RF HFDF in order to locate the source of switching power supply RFI on 40 meters, which occurs in clusters about every 55 KHz (and lower amplitude in between.)

I can get a deep null rotating the loop. The problem is that if I walk to another spot say 20,30, or 50 feet away the null is now pointing to a different source. Sometimes I get a deep null where the RFI appears to be emanating from a house, but then if I walk several tens of feet the null then appears to be coming from someplace else such as a power pole or my neighbor's pool pump. Driving me crazy. Ambiguous multiple directions for the source location. The RFI  seems to be "all over the place" which it very well may be, being conducted along the power lines.

Any suggestions how to better determine the "real" source?

Thanks

 56 
 on: Yesterday at 04:17:46 PM 
Started by N4MJG - Last post by AC2KV
Take a look at the Windcamp battery. Looks good and I believe it's a 3000mah pack.

 57 
 on: Yesterday at 04:14:57 PM 
Started by KE8HAG - Last post by KC8KTN
KE8HAG you will soon find out some are so quick to pile on and judge.You will do fine in the hobby. Take care God Bless and be safe. 73$$$$.  p.s #1 This site is AWESOME P.S.#2 The moderators here have common sence and are  very fair.Again be safe and enjoy.Trying to make ham radio a freindly and not so judgemental place...73$$$
WOW..

 58 
 on: Yesterday at 04:14:39 PM 
Started by KE0IOU - Last post by WA3SKN
If possible, put the balun as close to the antenna as you can.  I assume you are using a coax feed.

-Mike.

 59 
 on: Yesterday at 03:58:33 PM 
Started by K1LEM - Last post by KM1H
One thing that works very well to boost efficiency over a poor ground with a bunch of radials is to lay down a mesh of 2x4" grid galvanized fencing about 50-60' from the base of the antenna. This is where most loss occurs.

50' rolls of various diameters and hot dipped in plastic are available from many sources; look for those with a real galvanized coat not Chinese electroplating. Galvanizing is easily soldered so copper wire can be used to make lots of connections.

For a shorty vertical consider raising it up to 10-20' and use elevated radials and with the mesh below on the ground and not connected to anything. It will mitigate a lot of the ground loss from just 4-8 elevated radials but more is ALWAYS better.

Carl

 60 
 on: Yesterday at 03:54:55 PM 
Started by W2IRT - Last post by N6YFM
So does anyone have confirmation that NaP3 works for them on Windows 10?
This is my next project also.  So now there are two of us interesting in tips and
what potholes to avoid.

Cheers,

Neal

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