Bryan

What did you tell me to look up? Concerning hiking and radio?

Scott 

W9EQD 

On Mar 11, 2020, at 09:58, James Whitehill <jdwhitehill1603@...> wrote:



Bryan,

Thanks for the additional, useful information in this email.  But special thanks for the presentation last night, which excited a lot of interest.  I'm glad you went last, on the principle of saving the best for last!  Your presentation, which you have done before elsewhere, showed polish and efficiency.  Lots of ideas and experiment are embedded in your kit and I think will inspire others, including me, to develop our own kits and antennas.  Well done!

Jim, N0SSM

On Tue, Mar 10, 2020 at 10:46 PM Bryan Nehl <k0emt@...> wrote:

I mentioned a couple of resources at the meeting tonight.

Here are links to them.

“Random Wire Lengths”

https://udel.edu/~mm/ham/randomWire/

http://www.hamuniverse.com/randomwireantennalengths.html

Good lengths in ft: 29  35.5  41  58  71  84  107  119  148  203  347  407  423

Trapped End Fed Half Wave Antennas

http://peanutpower.co.uk/efhw

There are quite a few resources on the internet about trifilar winding a 9:1 transformer.

For the 9:1 and 49:1 transformers you can also wind a primary and secondary on the same core independently.

In the example below L1 (primary) has 3 turns and L2 at 9 turns.  Ratio is 1:3, square that 3 and it is a 9:1 transformer.  Could also easily wind a primary with 2 turns and secondary with 14 turns for EFHW (49:1). 

 

Wired up ~17’ radiator and 6’ counterpoise.  Kx3 had no trouble tuning it anywhere.  Typically I use a 58’ radiator with 9:1 or the trapped EFHW.

The article about portable masts can be found here: http://www.4sqrp.com/4sqrpNewsLetter/201908.pdf

72/73 de Bryan, k0emt

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I mentioned a couple of resources at the meeting tonight.

Here are links to them.

“Random Wire Lengths”

https://udel.edu/~mm/ham/randomWire/

http://www.hamuniverse.com/randomwireantennalengths.html

Good lengths in ft: 29  35.5  41  58  71  84  107  119  148  203  347  407  423

Trapped End Fed Half Wave Antennas

http://peanutpower.co.uk/efhw

There are quite a few resources on the internet about trifilar winding a 9:1 transformer.

For the 9:1 and 49:1 transformers you can also wind a primary and secondary on the same core independently.

In the example below L1 (primary) has 3 turns and L2 at 9 turns.  Ratio is 1:3, square that 3 and it is a 9:1 transformer.  Could also easily wind a primary with 2 turns and secondary with 14 turns for EFHW (49:1). 

 

Wired up ~17’ radiator and 6’ counterpoise.  Kx3 had no trouble tuning it anywhere.  Typically I use a 58’ radiator with 9:1 or the trapped EFHW.

The article about portable masts can be found here: http://www.4sqrp.com/4sqrpNewsLetter/201908.pdf

72/73 de Bryan, k0emt

Bryan

Your presentation gave us a rich source of devices for go packs. Thanks for sharing.

73

Fred AE0FD



At 10:46 PM 3/10/2020, you wrote:

I mentioned a couple of resources at the meeting tonight.

Here are links to them.

“Random Wire Lengths�

https://udel.edu/~mm/ham/randomWire/

http://www.hamuniverse.com/randomwireantennalengths.html

Good lengths in ft: 29  35.5  41  58  71  84  107  119  148  203  347  407  423

Trapped End Fed Half Wave Antennas

http://peanutpower.co.uk/efhw

There are quite a few resources on the internet about trifilar winding a 9:1 transformer.

For the 9:1 and 49:1 transformers you can also wind a primary and secondary on the same core independently.

In the example below L1 (primary) has 3 turns and L2 at 9 turns.  Ratio is 1:3, square that 3 and it is a 9:1 transformer.  Could also easily wind a primary with 2 turns and secondary with 14 turns for EFHW (49:1).
 
Wired up ~17’ radiator and 6’ counterpoise.  Kx3 had no trouble tuning it anywhere.  Typically I use a 58’ radiator with 9:1 or the trapped EFHW.

The article about portable masts can be found here: http://www.4sqrp.com/4sqrpNewsLetter/201908.pdf

72/73 de Bryan, k0emt

I have had to go into an assisted living facility.  I have a lot of miscellaneous ham radio stuff in my house that I need to dispose of so the house can be sold.  None of it frankly is high quality but all of it is still useful.  I have my mobile tri-bander along with its antenna and power cable. I never had a base station of any value as my interest was always QRP.

If you will agree to get it out of the house you can have it for free.

Email me direct if this is of interest to you.

NORMAN LAMPTON JD

Attorney at Law

permanent retired

{KC0FNA  146.520}

This week is Severe Weather Awareness Week for Missouri (my sister-in-law reminded me).  Here is the link.

https://www.weather.gov/lsx/severeweek

The statewide tornado drill is scheduled for Tue, March 3rd, at 10:00am CST. 

John - NO0I