Re: [Elecraft] OT; Feedline question

I'll agree with both points. That said, think about the space between wires. On and about the wires is a relatively thin layer of plastic. From there, the space between wires is filled with...wait for it...air. It might be worthwhile to read this: http://k6mhe.com/n7ws/Ladder_Line.pdf On

[Elecraft] Elecraft CW Net Announcement

Good Evening, The sun has continued to be quiescent. A CME just grazed us and another high speed stream of wind is on the way for tomorrow. Ions are getting to the ionosphere but nothing like last spring. Spinning the knob gives me not much to nothing on the higher bands while lower down

Re: [Elecraft] Sub Receiver I.F. Tap

Yes it is possible  I was going to replacate the buffer amp as it was on the main receiver for my sub receiver  Original message From: wa9fvp Date: 2017-04-15 11:52 PM (GMT-05:00) To: elecraft@mailman.qth.net Subject: [Elecraft] Sub Receiver I.F.

[Elecraft] Sub Receiver I.F. Tap

I notice on the sub-receiver schematic dated 8/18/08 that there was a connector for a plug-in board. I assume it was for an I.F. buffer plug-in circuit that connects to J93 for an I.F. tap. I didn’t see that on the KRX3A but the jumper W3 is near connector J78. Is it possible to attach a J309 to

Re: [Elecraft] KPA500 mobile?

As Phil knows, it is commonly used on ships in the US Navy for the same reason. Many US Navy ships have an on-board cellular system but it's useless without a way to get RF into all the compartments and passageways through steel plate! 73, Ron AC7AC -Original Message- From: Elecraft

Re: [Elecraft] Heathkit Tool.

Yep, I have one too. 73, Ron AC7AC -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of wa9fvp Sent: Saturday, April 15, 2017 1:38 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Heathkit Tool. Years ago I built a Heathkit SB101 and other smaller

Re: [Elecraft] Sub Receiver & KBPF3

Hi Jack: Page 16 of the KBPF3A manual says under the heading "Enable the KBPF3A Module": "Enable the KBPF3A for either the main or sub receiver using the CONFIG menu as described in the Owner's Manual. The KBPF3A will not operate until this is done!" Perhaps I should have repeated the whole

Re: [Elecraft] KPA500 mobile?

The very best station on Sirius/XM really destroys the beautiful melodious sounds and overtones coming from the banjo. It gives it a watery metal sound. However that does not stop me from listening to it. It is really all about the content. That's why I can enjoy bluegrass on my iphone or XM

Re: [Elecraft] OT; Feedline question

Actually thermoplastics are NOT majority air I'm not an expert here, but the dielectric constant appears to increase with thickness and probably with density of the material. Keep in mind that the standard insulation on THHN is 0.015" thermoplastic (PVC) and that is covered by a 3-4 mill

Re: [Elecraft] OT; Feedline question

Why do you suppose a little bit of dielectric on the wire would make a huge change, when the majority of dielectric is still air? On 4/15/2017 3:56 PM, Clay Autery wrote: Thanks So, these numbers are for BARE copper, right? Using insulated wire changes things a bunch For instance 18

Re: [Elecraft] KPA500 mobile?

Touche! :) __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 4/15/2017 7:24 PM, Bob Nielsen wrote: > Waveguide below cutoff. > > On 4/15/17 10:54 AM, Clay Autery wrote: >> The ultimate directional, high-pass filter... >> >> __ >> Clay Autery,

Re: [Elecraft] OT: Re: KPA500 mobile?

The tunnel on Taylor Road, Newcastle, CA, which is the best candidate for a tunnel on a road that may have been part of the old US Route 40 as it officially ends in Utah now. :) That tunnel runs ENE to WSW or therabouts... 0.103 km or 544.6 feet 62 degrees 49 minutes from south to

Re: [Elecraft] [K3] No Power out, no sigs in

I had similar trouble related to the synthesizer boards on a K3. On the newer KSYN3A boards there is a green LED on the top edge of the board that should be ON if the board is working ok. You mentioned a sub RX so you should have two of these boards mounted against the back of the front panel.

Re: [Elecraft] KPA500 mobile?

Waveguide below cutoff. On 4/15/17 10:54 AM, Clay Autery wrote: The ultimate directional, high-pass filter... __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 4/15/2017 10:14 AM, Jim Stahl via Elecraft wrote: OTOH, this can be a feature of tunnels, not a bug.

Re: [Elecraft] OT: Re: KPA500 mobile?

I think that both XM and Sirius were/are using 2.2 GHzor thereabouts. It's not MSS territory, but it works if you have enough power behind it. 73, matt W6NIA On 4/15/2017 4:32 PM, Fred Jensen wrote: Well, one of the side benefits of this list ... lots of smart and knowledgeable people. A

[Elecraft] [K3] No Power out, no sigs in

Elecrafters, i'm on vacation at a /p qth and K3 #2878 has quit working. I have no power out. The display reads 0.0 watts when holding the tune button, regardless of mode. In RX I hear noise from the headphones , but no signals. The noise sounds like the K3 sounds when no antenna is attached.

Re: [Elecraft] OT: Re: KPA500 mobile?

Well, one of the side benefits of this list ... lots of smart and knowledgeable people. A summary and then it can pass into the archive ... 1. The first of "my" tunnels is in Newcastle CA [between Auburn and Sacramento on the old US40 and Lincoln Hwy route] and was constructed sometime

Re: [Elecraft] OT; Feedline question

I don't think you're missing anything. It was a good question. Please also see Clay's reply. 73, matt W6NIA On 4/15/2017 4:08 PM, Richard Fjeld wrote: Okay, and thanks to all for the info which I will save. What made me curious is that twin lead is stated in steps of 150 ohms. IE. 300,

[Elecraft] OT: Leaky coax

Lots of "leaky" coax in use, both passive and active. Used in mines, buildings, both large and tall, paging systems in hospitals, etc. Here in the mountains of Montana most RR tunnels have it for carrying control signals between front and rear multiple-engine units. There are antennas connect

Re: [Elecraft] OT; Feedline question

I was trying to find the dielectric constant (Epsilon sub r) for this poly jacket that's used on the standard HRO-available line. The calculations I did were for open wire line with air being the dialectric (something like 1.0054). The first ladder line that I used was made from BIC pens,

Re: [Elecraft] OT; Feedline question

Okay, and thanks to all for the info which I will save. What made me curious is that twin lead is stated in steps of 150 ohms. IE. 300, 450, 600. I assumed it was to match the impedance of certain antennas such as a folded dipole, etc. Since I understand my loop to be a non-resonant antenna,

Re: [Elecraft] OT; Feedline question

Thanks So, these numbers are for BARE copper, right? Using insulated wire changes things a bunch For instance 18 GA THHN/THWN has an approx. dc of 2.35, XLPE has a dc of 5 or so As the dielectric constant gets larger, things get real fast. 18 GA THHN/THWN... (dc = 2.35

Re: [Elecraft] KPA500 mobile? -- OT tunnel communications

On 4/15/2017 8:45 AM, Phil Hystad wrote: > And, cellular service will be ultimately in all of the tunnels under > Seattle and already exists in the oldest downtown tunnel as described > here: "All it takes is money" (my favorite phrase) Now if they were to fund ham-band repeaters - that

Re: [Elecraft] Heathkit Tool.

Never bought from this place but this looks similar to the nut started of old... http://smallbear-electronics.mybigcommerce.com/search.php?search_query=3215=0=0 On Sat, Apr 15, 2017 at 6:04 PM, Eric J wrote: > Very handy. It was called a Nut Starter. All mine became

Re: [Elecraft] KPA500 mobile?

On 4/15/2017 7:43 AM, Phil Hystad wrote: > Unfortunately, I can’t remember anything of the details of how this > was done but I suspect wide-band amplifiers and wires and top-side > wide-band antennas. Leaky coax (trade name == Radiax). It's many-decades-old technology. 73 de K2ASP - Phil Kane

Re: [Elecraft] Heathkit Tool.

Very handy. It was called a Nut Starter. All mine became too worn to use. I tried soda straws of different diameter and they sort of work for awhile, but they tend to split. Turns out Mouser.com has them for about 2 bucks. Search for Menda, the manufacturer or "Nut Starter". I had them throw

Re: [Elecraft] OT; Feedline question

Very true! Got back in front of my desktop 'puter and made an Excel worksheet to calculate the characteristic impedance at various spacings and wire sizes. The real variable is the ratio of spacing divided by wire diameter (only the ratio matters). Everything else in the formula is a

Re: [Elecraft] Has anyone tried the aftermarket K3 Filters from ebay?

The ONLY non-Elecraft supplied filter I have tried is the 700 Hz pair I bought from UNPCBS.com http://www.unpcbs.com/#k3_filter They have done multiple group buys and they source them the same place as Elecraft They work great! Only place to get a 700Hz. I would be hesitant to buy from

Re: [Elecraft] Heathkit Tool.

HI You are not alone... , from an HW101 73, Laurent F6DEX - Laurent F6DEX -- View this message in context: http://elecraft.365791.n2.nabble.com/Heathkit-Tool-tp7629328p7629330.html Sent from the Elecraft

Re: [Elecraft] Heathkit Tool.

Jack, I totally agree, very handy! I still have every one that came with a Heathkit that I assembled. 73, Bill - NA5DX On 4/15/2017 3:37 PM, wa9fvp wrote: Years ago I built a Heathkit SB101 and other smaller projects. Normally they would include a very a handy tool. It's a plastic,

[Elecraft] Heathkit Tool.

Years ago I built a Heathkit SB101 and other smaller projects. Normally they would include a very a handy tool. It's a plastic, what I call, a "nut holding" tool. Keeping it all these years I found it to be very handy while assembling my KPA500, KAT500 and K3S.

[Elecraft] Sub Receiver & KBPF3

I just installed the Sub receiver and the KBPF3A in my K3S. I have one complaint and one concern. First the activation of the KBPF3A is very vague. It's mentioned in the users manual on page 60 (the configuration menu) but there's nothing that says, while in (CONFIG:KBFP3) that you have to

[Elecraft] Has anyone tried the aftermarket K3 Filters from ebay?

I was curious if anyone had tried the Aftermarket K3 Filters on ebay? (I'm not in the market for more filters as my K3 is basically full) Thank you __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

[Elecraft] Visalia RFI Talk

I'm scheduled to give a talk on Friday at the Visalia DX Convention about Finding and Killing Receive Noise. This is a slightly shortened version of what I did at Pacificon last fall. It's a long talk, and needs far more than the 45 minutes allotted. The talk is the last one before lunch, and

[Elecraft] New KX2 firmware with 4 programmable functions and home/field ATU settings

KX2 beta firmware rev 2.75 has two new features: 4 programmable switch functions, and two full sets of ATU data, typically used for home/field or for two different antennas that overlap in their band coverage. The firmware can be found at: http://www.elecraft.com/KX2/kx2_software.htm

Re: [Elecraft] KPA500 mobile?

The ultimate directional, high-pass filter... __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 4/15/2017 10:14 AM, Jim Stahl via Elecraft wrote: > OTOH, this can be a feature of tunnels, not a bug. Several years ago I was > riding on the “BikePike”, an abandoned

Re: [Elecraft] OT; Feedline question

Off-list one person learns. On-list we all learn. On 4/15/2017 10:16 AM, Matt Zilmer wrote: This is an amateur topic, so there's no reason to take it offline, imho. __ Elecraft mailing list Home:

Re: [Elecraft] KPA500 mobile?

Hate to hear that... Wife loves it. (2014 Fusion). I'm mostly happy with it, too. Though I prefer to just play what I want from my phone (high bit-rate mp3). Of course, neither of us are audiophiles, and I flew helicopters... __ Clay Autery, KY5G MONTAC Enterprises (318)

[Elecraft] OT: Re: KPA500 mobile?

I would think it would depend almost entirely on the orientation of the tunnel... (and satellite reception azimuth). First, the longest of those two tunnels is only 425 feet or so. The other is significantly shorter (southbound). The tunnels are oriented generally north/south which is the

Re: [Elecraft] Mobile operation RFI from QRO (was KPA500 mobile)

On Sat,4/15/2017 8:55 AM, Colin Brench via Elecraft wrote: My expertise is in EMI control and so I can provide some background to how unexpected things happen. Great post, Colin. RF fields around the antenna will be high and most mobile antennas have a low input impedance. To fully

Re: [Elecraft] OT; Feedline question

This is an amateur topic, so there's no reason to take it offline, imho. If you run the impedance vs spacing calculations, you'll see the spacing doesn't make a whale of a lot of difference. I don't have the numbers here, but I switched from 1/2 of a BIC pen body (hole centers about 2" apart)

[Elecraft] OT; Feedline question

Forgive me for the OT, but there are many antenna people here above my pay-grade. I need to replace the spacers on my ladder line. If I deviate from the standard spacer length for impedance (separation between conductors), are there problems I'm not thinking of? I use a quality manual tuner,

Re: [Elecraft] Mobile operation RFI from QRO (was KPA500 mobile)

This is why I run 10 watts mobile with the KX2 or KX3 :) Last time I tried this, using 10 W into a Hustler 40-m whip, I worked JA1NUT on CW and had no trouble checking into a statewide net on SSB. Also had quite a few SSB QSOs on 17 m. So if you find all this excellent information about

[Elecraft] Mobile operation RFI from QRO (was KPA500 mobile)

Greetings to all, I thought I would start a separate thread to expand this topic is a slightly different direction as this topic touches on a number of areas. The exposure discussion is very valid especially in today's vehicles that often contain composites rather than metal panels, but I will

Re: [Elecraft] KPA500 mobile? -- OT tunnel communications

I found one link that describes basically this service for AM/FM radio reception in the I-90 tunnels. It is section 7.3 (right near the end) of this link: http://www.wsdot.wa.gov/sites/default/files/2012/06/26/I-90TunnelSystem.pdf And, cellular service will be ultimately in all of the tunnels

Re: [Elecraft] KPA500 mobile?

OTOH, this can be a feature of tunnels, not a bug. Several years ago I was riding on the “BikePike”, an abandoned section of the PA Turnpike east of Breezewood that has become a bicycle route featuring two old tunnels. Although closed off to motor vehicle traffic, we noticed a pickup parked

Re: [Elecraft] KPA500 mobile?

A number of tunnels are “wired” for broadband radio reception. A bit of years ago when they were building the I-90 stretch between Bellevue and Seattle there are two major “tunnels” on each side of the I-90 floating bridge (across Lake Washington). The tunnel on Mercer Island is actually not

Re: [Elecraft] [P3] SVGA Option: transmitted text not visible on external display

Hi Adrian, The only way to view transmitted cw on the P3 transmit window would be by using an USB keyboard plugged into the rear of the P3. Paddles will not work. 73, Charles N2SO Treasurer, Quarter Century Wireless Association, Inc. http://QCWA.org On Saturday, April 15, 2017 7:21 AM,

[Elecraft] [P3] SVGA Option: transmitted text not visible on external display

Hello,I finally was able to set up the SVGA option in my P3 but I'm just wondering why when transmitting CW with my paddle text is not visible on the external display.Everything seems to be setup correctly.thanks for Your help Adrian, DH1AHL, 

Re: [Elecraft] KPA500 mobile?

Shameless Promotion but interesting story: Two years ago in the Florida QSO Party, our local "Mad Scientist" and mobile operations God Chris, NX4N, decided to do something that had never been done before: A Multi Multi mobile entry! In his Chevy Suburban, we had four radios: A K3 in the front