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] Auto-spot, tuning aids, and the arcane history of CW pitch-matching

Of course I know that.  Mine was a rhetorical question. On 1/23/2019 6:08 PM, ab2tc wrote: Hi, It doesn't "compound". A 10Hz drift at the antenna output of the K3, will be reflected as a 10Hz drift at the output of any transverter, be it VHF, UHF or microwave. At the higher frequencies even a

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] HF Stealth Loops

I'm working on a potentially collapsible and packable small transmitting loop. The main loop support is a 27-inch bicycle inner tube. On an earlier version, I made a single loop unit using a wooden support system and plastic plumbers pipe support strap, with conductive-adhesive backed copper foil

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

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Re: [Elecraft] Auto-spot, tuning aids, and the arcane history of CW pitch-matching

I've never had a drift issue with any of my modern transceivers on 28MHz as the IF. Now the TCXO drift in the transverters is real issue. Bob, K4TAX Sent from my iPhone > On Jan 23, 2019, at 7:08 PM, ab2tc wrote: > > Hi, > > It doesn't "compound". A 10Hz drift at the antenna output of

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

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Re: [Elecraft] Auto-spot, tuning aids, and the arcane history of CW pitch-matching

Hi, It doesn't "compound". A 10Hz drift at the antenna output of the K3, will be reflected as a 10Hz drift at the output of any transverter, be it VHF, UHF or microwave. At the higher frequencies even a transverter with an OCXO its drift would probably dominate. AB2TC - Knut Wes Stewart-2

Re: [Elecraft] HF Stealth Loops

Prefer the W4OP loop due to ruggedness and remote tune feature. Yes, its heavier but how many of us actually hike to the top of a big mountain? What would be great, however, would be a mag loop that the KX2 or KX3 could remotely tuned from the rig. I’d pay for that ... Joe W1GO > On Jan

[Elecraft] HF Stealth Loops

Anyone interested in magloops should visit www.alexloop.com  by Alex, PY1AHD.  He has really pioneered the popularity of small, portable loops and has built many  experimental loops.  There is a video of him setting up an AlexLoop in 90 seconds (not rushed) at www.alexloop.com A magloop inside

Re: [Elecraft] Auto-spot, tuning aids, and the arcane history of CW pitch-matching

Dave, Put the external reference oscillator input option on your K3 and avoid that situation with an external 10 MHz reference oscillator. The K3 Reference Oscillator temperature steering is from the static temperature offsets. If you have equipment to do better than the Data Sheet, you

[Elecraft] Not built 40/20 K1 Kit

.In 2000 I purchased for a high school friend a two band [40 and 20]  K1 kit.  Idea was to kick start his interest in ham radio. Turned out he put the kit away and never returned to ham radio. Anyone interested in a 40 and 20 meter original K1 kit in the original box and packaging? 73  Bob 

Re: [Elecraft] Auto-spot, tuning aids, and the arcane history of CW pitch-matching

You should be subscribed to Timenuts. But clearly one of us is confused. If you're using an OCXO in your transverter and up converting the K3, how does K3 drift/inaccuracy "compound" at UHF? Can you read that watch to 50 ms?  What are you going to do when WWVB goes QRT? Wes  N7WS On

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] Urban stealth HF: Inside-the-backpack loop antenna?

10+ years ago, we built a HF loop inside a coat. I can’t really tell you the application but the loop was made of copper braid and put between the liner and the outer shell of the coat. It was tuned with a simple L match with a LED to indicate peak power. We operated it on the 80, 60 and 40m

Re: [Elecraft] K2 VCO Alignment T5 L30

Tom, On my latest K2 build, I put a 1pf cap into the C68 (10pf) location. The 1pf cap was labelled "1D", which looked a lot like a "10" to my eyes. I think it took me about 4 hours to figure that one out. Once fixed, it all fell into place, and everything worked. We all do it! 73, Jim KO5V

Re: [Elecraft] Auto-spot, tuning aids, and the arcane history of CW pitch-matching

> Are you serious? > Wes N7WS Wes, Yes. I'm a stickler for accuracy. It always bothered me that the so-called 'temperature compensated' LO in the K3 was not actively being steered by temperature compensation (i.e. I could only put static temperature offsets into the rig memory from the

Re: [Elecraft] K3 KAT3 High SWR Issue Solved

Mark, I am not certain when they stopped installing the trap in the KAT3, but I know it is not in the KAT3A. If you pull your KAT3 out for any reason, eliminate the trap. 73, Don W3FPR On 1/23/2019 2:07 PM, Mark Musick wrote: Don, Is the trap in all KAT3s up through those installed in K3s

Re: [Elecraft] K3 KAT3 High SWR Issue Solved

Don, Is the trap in all KAT3s up through those installed in K3s with 9000 or just the early K3s below some serial number? Mark, WB9CIF -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Don Wilhelm Sent: Wednesday, January 23, 2019 18:48 To: K9MA ;

Re: [Elecraft] Urban Stealth

A pack frame is just about right for a 2 m moxon beam, but that isn’t HF. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Jan 22, 2019, at 7:22 PM, Norm Lee > wrote: > > Good thinking, Grant.

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

> Here's another idea. > > Run a wire inside your shirt from one cuff across your back and down to > the other cuff. Wrap loading coils around each arm just above the > elbow. Feed the "dipole" in the center at the back of your neck. > > I did a quick model (assuming your arms are held

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

The loop would be only 6 to 8” from soft tissue, so you’d want to run QRP, of course. OTOH, we’re talking about HF. A cellphone by your ear is probably worse. Any other antenna suggestions? Wayne N6KR Who was that guy at the HFPack get-together at HARA a few Daytons ago, that was running A

Re: [Elecraft] K3 KAT3 High SWR Issue Solved

Scott, It was added to the initial K3s, but later found not to be necessary, and if the trap broke down, it would cause trouble. So the KAR3A does not have it. 73, Don W3FPR On 1/23/2019 10:49 AM, K9MA wrote: On 1/23/2019 09:41, Ed G wrote: A fair amount of digging in the email archives

Re: [Elecraft] K3 S-meter reading and coax input or antenna voltage ?

At the antenna spigot. On 1/23/2019 10:00 AM, Phil Hystad via Elecraft wrote: If I had an S-meter reading, S9 for example, on my K3, what could I infer about the voltage level of that signal at the Coax input to my K3? A table I found on the Internet for singals below 30 MHz says that an S-9

Re: [Elecraft] K3 S-meter reading and coax input or antenna voltage ?

Phil, With the original K3, S Meter "ABS" mode the S meter is referenced to the signal level at the antenna jack.  S9 = -73 dBm = 50 uV into 50 ohms. In the other S Meter mode, the reading varies with ATT and PRE settings, as well as signal level. 73, Lyle KK7P On 1/23/19 10:00 AM, Phil

[Elecraft] K3 S-meter reading and coax input or antenna voltage ?

If I had an S-meter reading, S9 for example, on my K3, what could I infer about the voltage level of that signal at the Coax input to my K3? A table I found on the Internet for singals below 30 MHz says that an S-9 meter reading is a signal of 50-microvolts but where in the system is that

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

[Elecraft] KPA1500 Operating Remotely

Can someone assist me- off the reflector- with the different settings needed to operate the KPA1500 remotely? I have it operating behind a VPN, and I want to be able to operate it either via another computer at the location or via Ethernet from my residence. Thanks for your assistance. I can't

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] Urban stealth HF: Inside-the-backpack loop antenna?

Years back QST had an article that showed a home made 2 meter "filter" made in a garbage can,   they ran low power and placed a hot dog inside,  closed the lid and applied RF,   the hot dog was BBQed in short order, Perhaps with QRP one could put a sandwhich in one pocket and coffee in another

Re: [Elecraft] K3 KAT3 High SWR Issue Solved

On 1/23/2019 09:41, Ed G wrote: A fair amount of digging in the email archives found a couple posts which touched on an issue with the 8.215 MHz trap (C10 and L10) on the KAT3 tuner board. Although my older K3 doesn't seem to have a problem, I wonder why that trap was not required in the

[Elecraft] K3 KAT3 High SWR Issue Solved

I recently posted about a K3 40 meter SWR anomaly, where the K3 SWR reading on the front panel meter tended to increase as I tuned up higher in the band. I first observed the problem while using my Steppir yagi, which retunes itself so that I should have seen a low SWR across the entire 40

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

I love the AB7E concept... Looks an awful lot like birth of a new character for cosplay and a Comicon run to me: "EtherMan" - the RF belching steampunk simulacrum of an Isaac Asimov automaton! A little work with the 3D printer, an RPi with a 7" display, and some burnished 10 gauge wire coil

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

how about code to run a screwdriver antenna that is. I use my k2 /kxpa100 in my VW screwdriver up on the roof rack,. woeks great but could be elecraftmatic On 1/22/2019 10:56 PM, Wayne Burdick wrote: Thanks for the amazing response and great ideas. If someone wants to build a

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

The problem I see is Uncontrolled contents of backpack detuning the loop. Sent from my iPad > On Jan 22, 2019, at 10:56 PM, Wayne Burdick n...@elecraft.com [KX3] > wrote: > > Thanks for the amazing response and great ideas. > > If someone wants to build a backpack loop antenna for 20 m