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August 16, 2022, 09:10:29 AM *
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 on: Today at 07:01:27 AM 
Started by Ed WA4NJY - Last post by R. Fry SWL

   I would like to have a dedicated bi-directional antenna for 15 meters.  A little gain would help.

   Is the 3/2 wave dipole have any real advantage over a regular half-wave at same height?

The study below may be one solution.  This configuration smooths out the deep nulls in the pattern of a linear 1.5WL antenna, and has a fair amount of gain over a linear, 0.5WL horizontal dipole.


 on: Yesterday at 06:17:01 PM 
Started by Ed WA4NJY - Last post by Ed WA4NJY

   Many thanks to all who replied to my question.  I am leaning toward a rectangle loop for 15.  The project will have to wait until weather cools later this year.

                    Ed  WA4NJY
                    Bradenton, Fl

 on: Yesterday at 12:44:04 PM 
Started by K9EID - Last post by K9EID
Looking for a Heathkit HP 20 power supply to mate with my HX20/HR 20 .

Dr. Bob Heil, K9EID

 on: Yesterday at 09:16:03 AM 
Started by WA2SQQ - Last post by WA2SQQ
Ever wonder what causes those intermittent solder connections? Here’s a very visible demo.


 on: August 14, 2022, 09:00:10 PM 
Started by WA2SQQ - Last post by WA2SQQ
Listening now on 3885, and again, CHU is in the background. Earlier, listening on 6960, there was some CW. Started copying and it was stations on 40 CW. This looks like the receivers front end is experiencing some overload ….

 on: August 14, 2022, 06:34:49 PM 
Started by Ed WA4NJY - Last post by WA4WAX
An 8JK would be made to order for your situation. 

 on: August 14, 2022, 05:29:01 PM 
Started by WU2D - Last post by Pete, WA2CWA
Actually at this time of the year, sunspots are unimportant. Sporadic E runs rampant from roughly May through August each year  and doesn't care what the sun is doing.

Right now on 10 meters, single and multi hop Sporadic E contacts are very active.
however, many of the contacts are on digital and CW. See maps below taken at 5 PM EDT today.
Top picture includes digital, CW, and phone; bottom picture just phone.

A better place for sun spot frequency tickling is 15 meters and even 20 meters. MUF today is around 21 MHz.

Like 6 meters, which is also open today with single and multi hop Sporadic E, 10 meters has a lot of digital activity. I don't except that to change (except for phone contests) as we move into the winter months and a rising MUF.

 on: August 14, 2022, 12:37:50 PM 
Started by K4NYW - Last post by W1AEX
Thanks for posting the pics Nick. I really enjoyed the hamfest collection of stuff and know I would not have escaped without making a few purchases if I had been there. As Jim MER mentioned, it was a little distressing seeing the Fair Radio pics as it kind of looks like it is sliding away into oblivion. I remember grabbing stuff from them now and then when I was piecing together projects 40 years ago. I always enjoyed the catalog/flyers they sent out.

At any rate, great fun looking at everything while sipping my second cup of coffee this morning!

73,  Rob W1AEX

 on: August 14, 2022, 12:22:21 PM 
Started by WU2D - Last post by WU2D
The sunspots are popping up faster than predicted on this cycle (25), so it's time to get your 10M AM gear out of the back of the garage and get an antenna up.
Just get on 29.000 and call CQ. Of course weekends are the best bet.

 on: August 14, 2022, 10:06:12 AM 
Started by Ed WA4NJY - Last post by K9MB
Maybe you would like an extended double zepp.
It gives you two half waves in phase and some gain over a dipole plus a clean bi-directional pattern.
I built an array using this antenna for 20 meters that included passive reflectors and directors so that it became two 3 element yagis mounted side by side.
It can also be built as an inverted vee.


I agree that the delta or quad 1 wavelength loop is an excellent antenna.
73, Mike

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