Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

> > Jim Said: Cut a large double sided piece of double sided circuit board to > fit the > backpack. Etch the back side with a symmetric Hilbert curve split into 2 > columns fed > at the bottom center and the two columns attached at the top. Just don't accidentally etch a Do-Nha curve, or you

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

Cut a large double sided piece of double sided circuit board to fit the backpack. Etch the back side with a symmetric Hilbert curve split into 2 columns fed at the bottom center and the two columns attached at the top. Leave the other side as a solid ground plane... It will take some work to make

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

It might be useful to read W8JI’s take on the E/H antenna … https://www.w8ji.com/e-h_antenna.htm Grant NQ5T K3 #2091 KX3 #8342 > On Jan 23, 2019, at 10:07 PM, Wayne Burdick wrote: > > That might fit. Maybe something a little shorter, say 18". > > Can

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

That might fit. Maybe something a little shorter, say 18". Can it be used with just 2 feet of coax? What's the bandwidth? How does it compare to a 3' loop or a 4' whip? Wayne N6KR > On Jan 23, 2019, at 9:51 AM, Jeff Wagner wrote: > > See the picture of a 20 Meter EH antenna on my QRZ page

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

A proper shield of a KPA-1500/PS with battery and 240VAC inverter should be adequate protection if stuffed between the antenna and your backside ;-). ... Mike On 1/23/2019 11:34 AM, Wayne Burdick wrote: The entire purpose of the exercise is to be able to operate while walking. If the field

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

The entire purpose of the exercise is to be able to operate while walking. If the field is a potential health risk, power would have to be dropped accordingly. Wayne > On Jan 23, 2019, at 8:28 AM, Jim Miller wrote: > > I assume that this "backpack frame antenna" wouldn't be actually used

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

I assume that this "backpack frame antenna" wouldn't be actually used when being worn. The circulating currents in a Hi-Q loop result in strong RF fields along the loop axis which should be avoided in use. jim ab3cv On Wed, Jan 23, 2019 at 11:21 AM Wayne Burdick wrote: > Wish I had time to

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

Wish I had time to build one of these myself! A few other things in the queue Wayne N6KR > On Jan 23, 2019, at 6:32 AM, 'Dale Parfitt' pari...@frontier.com [KX3] > wrote: > > > HI Wolf, > > VK3YE could have done so much better from an efficiency standpoint without > making the loop

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

...@mailman.qth.net on behalf of Michael Blake via Elecraft Sent: Tuesday, January 22, 2019 4:40 PM To: Mark Goldberg Cc: Elecraft Reflector; KX3 Subject: Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna? Mark (W7MLG), It is scary how perfectly sane and normal your suggestions

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

Mark (W7MLG), It is scary how perfectly sane and normal your suggestions sound to me :) Very 73 - Mike - K9JRI > On Jan 22, 2019, at 4:32 PM, Mark Goldberg wrote: > > I would expect any high Q antenna like a loop would be detuned by any > movement or any metal you pass by. One more

Re: [Elecraft] [KX3] Urban stealth HF: Inside-the-backpack loop antenna?

I would expect any high Q antenna like a loop would be detuned by any movement or any metal you pass by. One more reason to support automatic mobile screwdriver / mag loop antenna tuning on the KX series. A flag on a backpack would be more or less ignored. Just put a flag on the top of the AX1.