Re: [Elecraft] RFI on K3s

Let's end this recurring thread for now in the interest of relieving email topic overload for others :-) Its well exceeding our single OT posting limit and has a wealth of past posts on this topic in our nabble archives etc. 73, Eric (a.k.a. Mr. Moderator) elecraft.com --- Sent from my iPhone

Re: [Elecraft] RFI on K3s

One can convert red/black zip wire pretty easily: zip wire separates by pulling the red side away from the black so you end up with two separate wires (you can even leave the power-pole connector on one end). Then twist the two wires to obtain twisted-pair. No waste of those existing power

Re: [Elecraft] Elecraft] RFI on K3s

It IS really nice cable though... Used that type and multi-conductor of same spec to wire helicopters when I was a Aviation MTP... Beautiful stuff. __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 6/21/2016 4:43 PM, Grant Youngman wrote: > I'm still wondering why

Re: [Elecraft] Elecraft] RFI on K3s

On Tue,6/21/2016 5:41 PM, Walter Underwood wrote: But thanks to the skin effect, silver plated power cables should conduct RFI energy BETTER than regular copper cables. Yes, but those silver plated cables are being touted for for loudspeakers, where, as I noted in an earlier post, cable

Re: [Elecraft] Elecraft] RFI on K3s

But thanks to the skin effect, silver plated power cables should conduct RFI energy BETTER than regular copper cables. I wasn’t going to respond again, but I’m weak. Eric should be invoking the “damping factor” on this thread soon. wunder K6WRU Walter Underwood CM87wj

Re: [Elecraft] Elecraft] RFI on K3s

its silver plated Bob K3DJC On Tue, 21 Jun 2016 16:43:44 -0500 Grant Youngman writes: > I'm still wondering why anyone would BUY a bit of 10 ga twisted pair. > It blows the mind. > > To each his own I suppose but really? > > On the other hand, I do know one or two

Re: [Elecraft] Elecraft] RFI on K3s

I'm still wondering why anyone would BUY a bit of 10 ga twisted pair. It blows the mind. To each his own I suppose but really? On the other hand, I do know one or two hams who will stare at a pair of RCA plugs and a bit of wire with a deer-in-the-headlights look in their eyes and then

Re: [Elecraft] Elecraft] RFI on K3s

Some one ask for this On ePay: http://www.ebay.com/itm/10-feet-10-AWG-Shielded-Twisted-Pair-Silver-Plated-Cable-speaker-wire-37-strands-/381493258989?hash=item58d2c52aed:g:2YEAAOSwTapV4jU~ de Ben W4SC __ Elecraft mailing list

[Elecraft] RFI on K3s

Tnx to all the input ... all my pwr leads in the shack are now twisted (as is my mind) ... never had RFI to begin with! tnx 73 Dwight NS9I __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

Re: [Elecraft] Elecraft] RFI on K3s

I'd likely be interested in about 100 feet. Have to study the specs more, but Anixster's part is half the cost of the others... __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 6/21/2016 9:48 AM, Walter Underwood wrote: > Belen appears to make a 10 AWG twisted pair

Re: [Elecraft] RFI on K3s

Dwight, here’s one example of a shield twisted pair: Belden 12/2 5000FE: http://www.showmecables.com/product/Belden-2-Conductor-12-Awg-Stranded-Shielded-Cable-Per-FT.aspx Twisted pair. Foil

Re: [Elecraft] RFI on K3s

Hi Jimmy, While I've not investigated it myself, I've been told by those who have that the bus conductors inside some of these boxes are not very robust. In my station, I've made my own cable splices using Power Pole connectors. One pair, as short as I can make it, goes directly to the K3,

Re: [Elecraft] Elecraft] RFI on K3s

Interesting. Putting one on my dishwasher almost completely silenced it. It had been S8. I'm thinking of adding one to the XYL's treadmill. 73 de Brian/K3KO On 6/21/2016 16:42 PM, Jim Brown wrote: On Tue,6/21/2016 9:22 AM, brian wrote: Nothing has been mentioned on what had been standard

Re: [Elecraft] RFI on K3s

On Mon,6/20/2016 6:50 PM, K9MA wrote: Call them what you will, connecting a bunch of station components to a common DC power return has to be done very carefully. Yes, it does. The rules are quite simple, and are articulated in the Power Point slides I referenced by a link. It's nothing more

Re: [Elecraft] Elecraft] RFI on K3s

On Tue,6/21/2016 9:22 AM, brian wrote: Nothing has been mentioned on what had been standard practice years ago. That is installing a good RFI filter on the mains right at the station. These filter can knock things down 40 dB in both directions. The reason nothing has been mentioned about it

Re: [Elecraft] Elecraft] RFI on K3s

The datasheet for this product doesn't say anything about it being twisted. In fact, they call it parallel in the description. http://www.belden.com/techdatas/metric/8678.pdf On Tue, Jun 21, 2016 at 10:48 AM, Walter Underwood wrote: > Belen appears to make a 10 AWG

Re: [Elecraft] Elecraft] RFI on K3s

I'm a big fan of Belden cables, but why go to the trouble of a group purchase when it is so easy to make your own twisted pair from lengths of stranded cable we can buy at the local big box store? The Belden cables referenced are primarily used for loudspeaker wiring in big sound systems. I

Re: [Elecraft] Elecraft] RFI on K3s

Perhaps rightly so, all this is focusing on RFI getting into the radio via the antenna. Nothing has been mentioned on what had been standard practice years ago. That is installing a good RFI filter on the mains right at the station. These filter can knock things down 40 dB in both directions.

Re: [Elecraft] Elecraft] RFI on K3s

> Cc: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Elecraft] RFI on K3s > > If one has a source of the red/black #10 zip cord (seemingly very common in > the > US), then simply zip it apart, and then twist it yourself. Then you still > have the > advantage of the color-coded

Re: [Elecraft] Elecraft] RFI on K3s

If one has a source of the red/black #10 zip cord (seemingly very common in the US), then simply zip it apart, and then twist it yourself. Then you still have the advantage of the color-coded wires. The #10 stuff I've got is 2 round insulated #10 medium stranded wires, one red insulated, one

Re: [Elecraft] Elecraft] RFI on K3s

Belen appears to make a 10 AWG twisted pair cable, but I only see it available in 500 foot spools. Search for "Belden 8678”. https://www.anixter.com/en_us/products/5T00UP-008500/BELDEN/Multi-Pair-Multi-Conductor-Cable/p/B5T00UP-500

Re: [Elecraft] RFI on K3s

Also, the Elecraft supplied DC zip cord can be twisted by hand pretty easily. RFI from wall-wart SMPS supplies might be improved by twisting their cords... 73, Drew AF2Z On 06/21/16 00:44, Vic Rosenthal wrote: Get some no. 10 stranded wire at Home Depot (etc.), double it over, put one

Re: [Elecraft] RFI on K3s

Works great! Do it all the time. Father showed me how 50 years ago, the same way Vic describes it ;o) On Tue, 21 Jun 2016 07:44:19 +0300, you wrote: >Get some no. 10 stranded wire at Home Depot (etc.), double it over, put one >end in a vise and the other in the chuck of your electric drill

Re: [Elecraft] RFI on K3s

: [Elecraft] RFI on K3s How can you detect the drifting if RF if Iyou have to turn off the K-3 and the P3? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post

Re: [Elecraft] Elecraft] RFI on K3s

No, unfortunately. There is a large Ace Hardware near me and places to buy building materials, but it's the not the same. 73, Vic, 4X6GP Rehovot, Israel Formerly K2VCO http://www.qsl.net/k2vco/ On 21 Jun 2016 08:19, Fred C. Jensen wrote: Home Depot is in Israel too? Fred K6DGW Vic

Re: [Elecraft] Elecraft] RFI on K3s

Home Depot is in Israel too? Fred K6DGW Vic Rosenthal wrote: >Get some no. 10 stranded wire at Home Depot (etc.), double it over, put one >end in a vise and the other in the chuck of your electric drill and twist >away. Not shielded, but much better than parallel wires. I

Re: [Elecraft] RFI on K3s

Get some no. 10 stranded wire at Home Depot (etc.), double it over, put one end in a vise and the other in the chuck of your electric drill and twist away. Not shielded, but much better than parallel wires. I suppose you could strip some RG-8 if you really wanted to shield it. Vic 4X6GP > On

Re: [Elecraft] RFI on K3s

Call them what you will, connecting a bunch of station components to a common DC power return has to be done very carefully. I've found that often the easiest solution is isolated power sources. Some accessories seem to be designed with the assumption of ground isolation using a dedicated wall

Re: [Elecraft] RFI on K3s

I've been told that the "loop" part of "ground loop" is a misnomer. I think the real problem is when a "chassis" connection doesn't really go to the conductive enclosure but rather follows on into the "ground" in the circuitry, which is probably better termed "common". In the olden days,

Re: [Elecraft] RFI on K3s

On Mon,6/20/2016 4:38 PM, K9MA wrote: Beware ground loops! Horse puckey -- ground loops do not exist, and this very false concept has caused hams to do completely wrong things to solve problems with hum, buzz, and RFI. http://k9yc.com/GroundingAndAudio.pdf 73, Jim K9YC

Re: [Elecraft] RFI on K3s

Beware ground loops! 73, Scott. K9MA -- Scott Ellington --- via iPad > On Jun 20, 2016, at 12:21 PM, Clay Autery wrote: > > Thanks... > > One of my goals is to completely eliminate wall warts in my shack. I > planned to use a nice quiet multi-voltage output

Re: [Elecraft] RFI on K3s

Jim ... where does one find #10 twisted pair? Is it shielded? thanks 73 Dwight NS9I On 6/20/2016 12:59 PM, Jim Brown wrote: On Mon,6/20/2016 10:33 AM, James Walker wrote: Is it normal to register voltage as low as I’m seeing on my K-3? What you're seeing sounds like IR drop in the DC

Re: [Elecraft] RFI on K3s

Jimmy, The voltage at your power supply may indeed be OK, but somewhere in the path to the K3, there is a huge resistance. Possible causes: - Lugs not tight at the power supply. Tighten nuts with a wrench. - Wire gauge inadequate for the K3 load on transmit - use #12 or better #10. - Long

Re: [Elecraft] RFI on K3s

I replaced two OLD astrons (over 30 years on each) last summer with a couple of Powerwerx SS-30DVs and have had no problems with noise at all. Having said that, I should qualify my statement: I have a typical noise level of band noise only. In other words, I receive no noise from local modern

Re: [Elecraft] RFI on K3s

Understand... I am conserving/reserving as much space as possible for amps and amp PS... and TMDE equipment. __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 6/20/2016 1:19 PM, Rick Robinson wrote: > I guess space might be a concern on large current supply's. There

Re: [Elecraft] RFI on K3s

That is woefully unacceptable voltage regulation... you have an issue. I believe the MAX spread on the K3 is 11-15 VDC IIRC. __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 6/20/2016 12:33 PM, James Walker wrote: > This thread has lead me to notice the comments on

Re: [Elecraft] RFI on K3s

Haven't yet... more of a general term to cover devicets/circuits to change a base voltage out to multiple needed. Many ways to skin that particular cat... ;) 73, __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 6/20/2016 12:27 PM, Don Wilhelm wrote: > Clay, > >

Re: [Elecraft] RFI on K3s

I guess space might be a concern on large current supply's. There are ways around that but I was mainly thinking qrp level power supply's. On Mon, Jun 20, 2016 at 1:15 PM, Clay Autery wrote: > On 6/20/2016 12:03 PM, Rick Robinson wrote: > > Why, if the weight would not be a

Re: [Elecraft] RFI on K3s

James - The first thing I would do is check the voltage at the K3. If you have a long run of cable from your PS, of if you have connectors that are not fully seated, or correctly installed, that would likely result in voltage drop that would be detrimental. Best of luck es 73 de Dave - K9FN On

Re: [Elecraft] RFI on K3s

On Mon,6/20/2016 10:33 AM, James Walker wrote: Is it normal to register voltage as low as I’m seeing on my K-3? What you're seeing sounds like IR drop in the DC cable. How long is the DC cable between the K3 and the power supply? What wire gauge? Is there any equipment (like distribution

Re: [Elecraft] RFI on K3s

This thread has lead me to notice the comments on operating voltage. I’ve been having some trouble with my K-3 and the MCU LD message on startup. It was suggested that I monitor the voltage on the rig during operation. I get the 13.5 on receive. But the voltage drops as low as 10.5 on 100 watt

Re: [Elecraft] RFI on K3s

I frequently use my KX3 for portable operation after an airplane trip. A light weight PS is a big plus since I am frequently near the 50 lb (22 Kg) limit. BTW, I have been quite happy with my Pro Audio Engineering PAE-Kx33 power supply, even in rural New Hampshire with the associated very

Re: [Elecraft] RFI on K3s

Clay, Where do you find buck/boost converters that are other than switch mode devices? Most all I have seen are similar to switch mode power supplies. 73, Don W3FPR On 6/20/2016 1:21 PM, Clay Autery wrote: One of my goals is to completely eliminate wall warts in my shack. I planned to use

Re: [Elecraft] RFI on K3s

Thanks... One of my goals is to completely eliminate wall warts in my shack. I planned to use a nice quiet multi-voltage output PS(s) and/or buck/boost converters (or other circuitry) to supply power to every device in the shack reducing the clutter/complexity/potential culprits. Now, I am

Re: [Elecraft] RFI on K3s

On 6/20/2016 12:03 PM, Rick Robinson wrote: > Why, if the weight would not be a factor, do folks want to take a chance on > a potentially noisy ps ? Because some of us are EXTREMELY limited on space... My entire shack must fit in a cube 4 feet x 3 feet by 8 feet. I suspect there are other

Re: [Elecraft] RFI on K3s

t; -Original Message- From: Clay Autery > Sent: Monday, June 20, 2016 5:41 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] RFI on K3s > > Marc and Drew, > > Appreciate the feedback... Checking my PS is my first test. Will power > off all circuits except the one t

Re: [Elecraft] RFI on K3s

LOL! Mine IS one of the newer ones that was originally 14.19 VDC. I learned where the pot was at HAMCOM, and the first thing I did when I got home was adjust it to provide the K3s 13.8. I am aware that this voided my warranty... I'd rather eat the cost of a new SS-30DV and KNOW I'm feeding the

Re: [Elecraft] RFI on K3s

--Original Message- From: Clay Autery Sent: Monday, June 20, 2016 5:41 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] RFI on K3s Marc and Drew, Appreciate the feedback... Checking my PS is my first test. Will power off all circuits except the one to my shack that runs the AC

Re: [Elecraft] RFI on K3s

that with a modern well suppresed QRO SMPS!.. > > 73. > > Dave G0WBX. > > > ~~~ Original message. > > From: Marc Veeneman<mveene...@yahoo.com> > To:pu...@af2z.net > Cc:elecraft@mailman.qth.net > Subject: Re: [Elecraft] RFI on K3s > Message-ID:<76882

Re: [Elecraft] RFI on K3s

I'm an old network guy, and have added "elimination of all parallel conductor cables" to my TODO list in favor of UTP/STP. Bottom Line: I want to quiet my "shack" as much as possible such that any significant RFI has to be external... __ Clay Autery, KY5G MONTAC Enterprises

Re: [Elecraft] RFI on K3s

FWIW, the ss-30dv that Elecraft sells is listed at 14.1 VDC. Older units sold elsewhere were listed at lower output voltage but you can adjust an internal pot to bring them up to 14.1. 73, Drew AF2Z On 06/20/16 11:30, Clay Autery wrote: I certainly hope you are correct. I love this little

Re: [Elecraft] RFI on K3s

On Mon,6/20/2016 3:46 AM, Dave Cole wrote: The last page says it is page 17 of 19... What's on the last 2 pages? Last two pages is stuff I deleted. :) BTW, nice job on the new paper on RFI! Thanks! 73, Jim __ Elecraft mailing

Re: [Elecraft] RFI on K3s

Marc and Drew, Appreciate the feedback... Checking my PS is my first test. Will power off all circuits except the one to my shack that runs the AC to the PS. Then I'll A/B with radio on battery and on the PS. (PS air-gapped/unplugged when on batt). If it is the PS, I'll try to choke the I/O

Re: [Elecraft] RFI on K3s

ppresed QRO SMPS!.. 73. Dave G0WBX. ~~~ Original message. From: Marc Veeneman<mveene...@yahoo.com> To:pu...@af2z.net Cc:elecraft@mailman.qth.net Subject: Re: [Elecraft] RFI on K3s Message-ID:<768828b9-af69-479e-8e38-2fbeec234...@yahoo.com> Content-Type: text/plain; charset=us-asci

Re: [Elecraft] RFI on K3s

Gents, that’s my setup also with K3S #10125, and I’m convinced the Powerwerx SS-30DV is a stable, quiet, top-notch amp recommended by the fine people a Elecraft (it’s what they use on the road). However, thanks to some great advice from people here, I have eliminated the black-red zip cable

Re: [Elecraft] RFI on K3s

I certainly hope you are correct. I love this little power supply. It keeps my K3s/P3 smack dab on 13.8 RX and no lower than 13.5 on TX@100W. But it will be check #1. Learned a long time ago not to make assumptions or NOT eliminate variables (when possible). 73, __ Clay

Re: [Elecraft] RFI on K3s

On 6/20/2016 5:28 AM, Dave Cole wrote: > Sometimes you can "get a feeling", where they are located by watching > the timing... Do they drift in the morning, and after sunset, if so, > the SMPS might be outside, on in a non temperature controlled area, if > not it might be inside... > > Do they

Re: [Elecraft] RFI on K3s

> Message: 20 > Date: Sun, 19 Jun 2016 23:55:59 -0500 > From: Clay Autery <caut...@montac.com> > To: Elecraft Reflector <elecraft@mailman.qth.net> > Subject: [Elecraft] RFI on K3s > Message-ID: <d758bc65-135d-95dd-c423-88b34ea3e...@montac.com> > Content-Ty

[Elecraft] RFI on K3s

Is the Powerwerx SS-30DV currently sold in the elecraft order page? 73 Johnny VR2XMC 寄件人︰ Marty Koszewski <mtkos...@gmail.com> 收件人︰ "elecraft@mailman.qth.net" <elecraft@mailman.qth.net> 傳送日期︰ 2016年06月20日 (週一) 9:17 PM 主題︰ Re: [Elecraft] RFI on K3s I had the same

Re: [Elecraft] RFI on K3s

--- Message: 20 Date: Sun, 19 Jun 2016 23:55:59 -0500 From: Clay Autery <caut...@montac.com> To: Elecraft Reflector <elecraft@mailman.qth.net> Subject: [Elecraft] RFI on K3s Message-ID: <d758bc65-135d-95dd-c423-88b34ea3e...@montac.com> Content-Type: t

Re: [Elecraft] RFI on K3s

I do also have multiple turns of the p/s power cord wound through a large toroid, just for good measure. I investigated the Powerwerx at one time when I was having some RFI problems, comparing it side by side with a linear supply, and just didn't find the ss-30dv to be a problem. My main

Re: [Elecraft] RFI on K3s

My PowerWerx supply DOES generate those drifting noise spikes, ruining CW on 80 meters for me. I have yet to find a 13.8 volt switching supply that can provide 25 quiet amps. I've gone entirely to batteries rather than use quiet but inefficient linear supplies. Now I only have SMPS noise

Re: [Elecraft] RFI on K3s

I have a Powerwerx SS-30DV also. I think it is unlikely that this PS would put out that kind of trash. I've found it to be very quiet even listening with an endfed wire antenna within inches of it. 73, Drew AF2Z On 06/20/16 01:38, Clay Autery wrote: That's what I figured... Now to locate

Re: [Elecraft] RFI on K3s

On Sun, 2016-06-19 at 22:05 -0700, Jim Brown wrote: > Digital circuitry or SMPS are the most likely cause. See my latest  > tutorial, linked below, to learn how to tell which is which. 34 kHz  > suggests a 17 kHz square wave. > > http://k9yc.com/KillingReceiveNoise.pdf > > 73, Jim K9YC Jim, The

Re: [Elecraft] RFI on K3s

On Sun,6/19/2016 10:02 PM, Clay Autery wrote: http://montac.com/images/shack/34kHz_RFI_-20MHz_to_30MHz_plus.jpg The traces drifting in frequency and modulated by noise tells us it's a switching power supply. 73, Jim K9YC __

Re: [Elecraft] RFI on K3s

On Sun,6/19/2016 9:55 PM, Clay Autery wrote: Anyone want to hazard a guess as to what is causing it? I disco'd every switch-mode power supply in the shack and adjacent rooms (couldn't do the whole house as the XYL was home) EXCEPT my Powerwerx SS-30DV PS running the K3s/P3. Digital

Re: [Elecraft] RFI on K3s

No images in reflector posts... Here's the link to the RFI I'm seeing on the P3 in 160 kHz of the 10+MHz bandwidth I checked. http://montac.com/images/shack/34kHz_RFI_-20MHz_to_30MHz_plus.jpg Original post below: __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On

[Elecraft] RFI on K3s

I am seeing a repetitive RFI source every 34kHz from somewhere less than 20MHz thru 30MHz plus... See attached image. The amplitude alternates high/low every other appearance. The overall amplitude is higher or lower depending on the location within the spectrum Almost a sine wave function