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[KJ4HKD]

just got my general lic and want to put up a dipole
a local ham gave me a 87 ft. 5-Band W9INN antenna and would like to find a copy of instructions that came with it

will be using it with a IC-718

thanks for any help to get me going

[W6TGE]

Easy...just google w9inn antenna.

[KH6AQ]

W9INN passed away a few years ago. The design 'secrets' went with him.

As far as I've been able to determine from talking with others and doing simulations he used self-resonant inductors as traps. No descrete shunt capacitors were used.

If I can get ahold of an actual W9INN antenna I will analyze the coil design and wire lengths and publish the results at eham. The results can include the theory and build instructions.

[KJ4HKD]

I do have the ant
not sure I know how to ck the coils for that kind of info
but I had read that its a good ant and that instructions came with it
been on web and can't find anywhere anyone has posted them to be downloaded
I the ant up today and it didn't seem to bring in signals anybetter but the noise was a lot less than a vertical that I have up (used ant switch to switch back and forth)

thanks for replys so far

[KH6AQ]

The coils can be measured as to diameter, length, number of wire turns. The antenna wire lengths can be measured. This would be enough for me to develop a NEC model and then build the antenna for testing.

Measuring the coils with a grid dip meter or an impedance analyzer would be nice and I can do this once I have the dimensions and can build a copy of the W9INN.

If you could supply me with the dimensions we can work on this together and get the W9INN design out where others can use it.

[K0OD]

I had, and may still have somewhere in the garage, remnants of an early 90s W9INN dipole. It was probably a 5 or 6 band job and used some "coils." His antennas were always well respected. You gave him your fav frequencies and antenna height and he built the dipole accordingly. He was very pleasant to work with, too.

Later I made my own full sized 15, 20 and 40 meter parallel dipoles (no coils) copying his construction method which held up well.

I believe he described his coils as chokes. There wasn't any visible capacitor.

Come to think of it, I might still have the W9INN antenna instructions around. Let me check and post back. It would be a shame to let his very nice designs die with him.    

[AB4ZT]

Is this it?

http://members.tcq.net/nzeronv/w9inn_mpd-5c-78_instructions.pdf

73,
Richard

[K0OD]

I bought two or three items from W9INN years ago. Dug out the instructions for my model MDB-025-10 (SSD-025-10) which was a 10-15-20 meter parallel dipole.  The top wire covered 15 and 20 with a "SH-1914 resonactor" near the end, as a trap would be. Underneath was an ordinary full sized 10 meter element. Dimensions for the 15-20 meter top wire aren't stated.

My instructions look very much like that PDF file and include much of the same general info.

One interesting thing is the amount of personalization on my instructions.  Instead of beginning "Dear Customer" as the PDF does, mine starts with "Dear Jeff" and includes  handwritten notes specific to the 10-15-20 meter model. In two places he signed it, "Bill."  Very smart marketing!


-------------------
What the heck is a "resonactor?"  That term according to Goggle is only used in reference to W9INN's antennas. You can find several discussions of Bill's fine antenna's if you look up the word "resonactor."


This old comment is interesting:

"I have not examined the resonactor in detail, but I believe it is just an inductor which is carefully wound to be self-resonant at the desired frequency, thereby eliminating the need for a separate capacitor to resonate it. A clever idea, since eliminating the separate capacitor easily allows full legal power without the expense of a very high voltage capacitor.

W9INN's trap dipoles are the only ones I know of which advertise full legal power handling, and that's why I purchased one. I've been running full power RTTY on mine for five years with no problems. Since I purchased mine there may have been other full power trap dipoles come on the market. If anyone knows of one, please reply. I'm always curious about such things.

Bill, W6WRT"

Jeff K0OD
 

[N2EY]

I think they are the same thing.

A Twin-Trap is a bifilar-wound solenoidal coil in which the start of one winding is connected to the finish of the other winding. The remaining two ends are connected to the antenna wires. The concept is the same as the N4UU-style coax-cable traps, but with parallel wires rather than coax. (Easier to adjust).

The result is a coil with very high self-capacitance, resulting in self-resonance without the need for external capacitors.

Anybody confirm this?
73 de Jim, N2EY

[KJ4HKD]

Hi gp
I got the ant untangled and put it up, at about 10' we put the ant anailyzer on it an it was off on every freq but 20m  thought maybe it was because it was close to the ground?   wrong answer.   put it up to about 30' and it received well but Tx was bad, ck ed again same readings so took it back down, starting looking and it ohmed out ok but when I unwraped some of the coils they were burnd  so I think it has been hit by lighting??   so left it low to work on and build a 80/40 dipole with something I understand "WD-1 field wire"  used that in signal corp worked well
but thanks for instructions they look good  
next nice day will start checking the coils one at a time....
thanks for all