Re: [Elecraft] Heathkit ad from '57
> The 32V2 is 110 lbs. I got one from a friend's estate and got rid of > it because of the weight alone. > > The Heath DX100 is 100 lbs, so I can understand a slipped disc! > > My Viking Ranger weighed 45 lbs. Hurts my back just to think about it, Ron. The good news: K3, 9 lbs. KX3, 1.5 lbs :) Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] (no subject)
Be cool! Stop smoking!. http://www.kpnmusicchiangmai.com/clickfriend.php?jqID=93a4 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] What your mother didn't tell you about transmission lines
On 9/11/2011 5:20 AM, Bill W4ZV wrote: > There is a loss graph on page 2 below but I believe ET3PMW's losses were > much higher. Of course this could have been due to poor quality wire > available in Ethiopia. At HF, loss is essentially due to the resistance of the conductors, plus whatever loss there might be due to mismatch. For matched loads, the current is less with higher impedance lines, so the loss is less. Most zip cord uses relatively small conductors. BTW -- have you ever noticed that the Red/Black glorified zip cord sold at hamfests by CB radio dealers is often smaller than it is marked? BIG insulation, very small copper. Advertised #12, but try stripping it and taking a micrometer (or ohmmeter) to it. Let's compare it to RG58 can be pretty lossy too, depending on how much copper was used to build it. At 10 MHz, the published loss data for Belden RG58 cables varies from 1.1 to 1.5dB/100 ft. That loss is ALL due to copper, and at 10 MHz, skin effect dominates. The shield in these RG58 cables is a MUCH greater diameter than in the zip cord, so the loss in the shield is a lot less than for the zip cord, which can be #18 or smaller. Another suggestion to our friend in ZL. Here in North America, cable TV companies use millions of feet of 75 ohm 1/2-inch hard line. Installation companies have no use for short lengths of cable, so it goes in the trash, and short lengths to these guys is often several hundred feet. If we make friends with our local CATV company, we are often able to replace the word "trash" with the words "back of my pickup." Loss data for this cable is roughly the same as for 50 ohm hard line. About two years ago, I inherited a very large spool of this stuff from a SK. I am currently installing two monobanders for 20M and 15M on a new tower, and have cut lengths of 1/2-inch hard line to feed both of them. One of them is already operational and works great. If you google, you will find excellent information about practical and technical details for using this stuff in your ham station, including how to easily fit PL259 connectors, and how to cut the cable to a whole number of half wavelengths so that the impedance is not transformed by the cable. Some very useful websites I found are by W9XT and N1GUN. There's also a nice piece that ran in the VHF column of QST in 2000. Search the ARRL website to find it. I'm in the process of putting together something myself that shows loss data and an alternate method of installing PL259 connectors. I found another piece on the internet that correctly observes that this coax can make stubs that are a bit higher Q than most other available coax. Higher Q means greater attenuation, but also narrower bandwidth for that attenuation. 73, Jim Brown K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] having enough radios
Good to see you using the right name for them, David. These days ex-CBers, or those influenced by CB, tend to call rigs and transceivers "radios". To me a radio is something on which one listens to broadcast stations. You are quite obviously a traditional ham - good on you. 73 de David G4DMP In a recent message, David Elliott writes > >The proper number of rigs is just one more. > -- + - - - - - - - - - - - - - - - - + | David M Pratt, Kippax, Leeds. | | Website: http://www.g4dmp.co.uk | + - - - - - - - - - - - - - - - - + __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Elecraft CW Net Report for September 11th & 12, 2011
Elecraft CW Net Report for September 11th & 12, 2011 Good Evening, The nets went very well today. Although twenty was not as long as normal forty meters more than made up for it. I just noticed the number of check ins on each is pretty balanced. After counting I find it is exactly balanced :) It was nice to hear so well on forty meters again. The normal noise did not show up until very late in the net. Now that the sun has become more active and the season is beginning to change the bands are changing. The new time for the second net helped a great deal but soon the sun will be down for the it. When that happens I'll move the net forward again. On to the lists => On 14050.5 kHz at 2200z: N0TA - John - CO - K3 - 994 NO8V - John - MI - K3 - 820 N0AR - Scott - MN - K2 - 4866 W0RSR - Mike - CO - K2 - 5767 W0CZ - Ken - ND - K3 - 457 K4JPN - Steve - GA - K2 - 1422 W7GVE - Ed - AZ AC5P - Mike - OK - K3 - 2170 On 7045 kHz at 0100z: K6DGW - Fred - CA - K3 - 642 N0TA - John - CO - K3 - 994 W0CZ - Ken - ND - K3 - 457 W8OV - Dave - TX - K3 - 3139 K0DTJ - Brian - CA - K3 - 4113 K6PJV - Dale - CA - K3 - 1183 N0AR - Scott - MN - K2 - 4866 KN5L - John - TX - K2 - 7212 I had N0AR call CQ on twenty meters but I don't think his signal was landing on the continent. Thanks anyway Scott. I was surprised when I heard him again on 40 meters. I have not worked that far east in many a net. Is this signs of things to come? The weather seems to be getting milder in the Midwest. Temperatures were in the 80s today. Here it was hotter than the stations checking in from California until Brian came along. I wonder what Steve would have mentioned from Georgia. I got his call sign but the QSB got him before I could work him again. Maybe he got some rain from the Gulf storm system. Last I heard they needed rain. Well the same is true here after a week of hot weather and about a month since the last rain. Only the foggy mornings are providing precipitation. Until next week stay well, 73, Kevin. KD5ONS (Net Control Operator 5th Class) - __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit ad from '57
Mark, Wow - Heath Time Payment Plan on orders totaling $90.00 or more - maybe they'll bring that back too! 73's, John W. AJ6BC On Sun, Sep 11, 2011 at 6:48 PM, Mike Markowski wrote: > With the recent talk of Heathkit I thought some might enjoy seeing an > old Heathkit ad. I just scanned it in from QST June 1957: > > http://udel.edu/~mm/ham/heathkitAd.png > > 73, > Mike ab3ap > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit ad from '57
You made me go look ;-) The 32V2 is 110 lbs. I got one from a friend's estate and got rid of it because of the weight alone. The Heath DX100 is 100 lbs, so I can understand a slipped disc! My Viking Ranger weighed 45 lbs. I thought that was plenty for one small box - even when I was a kid! They didn't call 'em "boat anchors" for no reason. Now I give out with an "OOF!" when I lift the KPA500 which weighs about half of what my Ranger did. Not only do parts get smaller as we get older, the rigs get heavier. 73, Ron AC7AC -Original Message- The DX-100 weighed enough to give my Dad (K3QDC, SK) his first slipped disk! He brought it home on approval but decided not to keep it. I don't recall whether the return was before or after the surgery. /Rick __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit ad from '57
The DX-100 weighed enough to give my Dad (K3QDC, SK) his first slipped disk! He brought it home on approval but decided not to keep it. I don't recall whether the return was before or after the surgery. /Rick On Sun, Sep 11, 2011 at 7:39 PM, Ron D'Eau Claire wrote: > Ah, but a rig is known by the company it keeps! > > Good marketing. A Collins owner who chooses the DX100 (and the DX100 was > lighter than the Collins transmitters I lifted - IIRC the 32V series > weighed > over 100 lbs.) > > -- Rick Tavan N6XI Truckee, CA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit ad from '57
Ah, but a rig is known by the company it keeps! Good marketing. A Collins owner who chooses the DX100 (and the DX100 was lighter than the Collins transmitters I lifted - IIRC the 32V series weighed over 100 lbs.) Tnx Mike! Ron AC7AC -Original Message- On 9/11/2011 6:48 PM, Mike Markowski wrote: > With the recent talk of Heathkit I thought some might enjoy seeing an > old Heathkit ad. I just scanned it in from QST June 1957: > > http://udel.edu/~mm/ham/heathkitAd.png Hmmm ... looks like a DX-100 paired with a 75A4? I could afford Heath with some help from Grandma, 75A4? I only dreamed. 73, Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 Calibration help
Hi Fred, Yes, at narrow spans there may be a small frequency error depending on the accuracy of the clock oscillator in the P3. The calibration procedure is in the "Calibration Procedures" section of the P3 Owner's Manual. You don't need a frequency counter or signal generator - you can calibrate using an off-the-air signal whose frequency is accurately known. (I generally use an AM broadcast station.) Alan N1AL On Sun, 2011-09-11 at 18:02 -0700, Fred Jensen wrote: > New P3 Jockey here. It seems to work fine. I note however that when I > have a CW signal zeroed on CWT [and with AUTO SPOT], it shows up just > below the center line that has the correct frequency displayed on the > K3. I think I need to download a new manual, the one that came with it > is apparently a couple of FW revs old. Is there some sort of > calibration process I'm supposed to do with the P3 Utility [which I just > downloaded]? > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the 2011 Cal QSO Party 1-2 Oct 2011 > - www.cqp.org > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 Calibration help
There is a REF CAL function on the P3 menu. Adjust it so the K3 and P3 agree. On 9/11/2011 6:02 PM, Fred Jensen wrote: > New P3 Jockey here. It seems to work fine. I note however that when I > have a CW signal zeroed on CWT [and with AUTO SPOT], it shows up just > below the center line that has the correct frequency displayed on the > K3. I think I need to download a new manual, the one that came with it > is apparently a couple of FW revs old. Is there some sort of > calibration process I'm supposed to do with the P3 Utility [which I just > downloaded]? > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the 2011 Cal QSO Party 1-2 Oct 2011 > - www.cqp.org -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit ad from '57
On 9/11/2011 6:48 PM, Mike Markowski wrote: > With the recent talk of Heathkit I thought some might enjoy seeing an > old Heathkit ad. I just scanned it in from QST June 1957: > > http://udel.edu/~mm/ham/heathkitAd.png Hmmm ... looks like a DX-100 paired with a 75A4? I could afford Heath with some help from Grandma, 75A4? I only dreamed. 73, Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] P3 Calibration help
On 9/11/2011 6:39 PM, Dwayne Rohmer wrote: > Fred, > > Try Menu: Ref Cal. Did just that this morning. Works like a charm. Thanks Dwayne, Worked great! I also found it in the manual ... just have to look harder. 73, Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Heathkit ad from '57
With the recent talk of Heathkit I thought some might enjoy seeing an old Heathkit ad. I just scanned it in from QST June 1957: http://udel.edu/~mm/ham/heathkitAd.png 73, Mike ab3ap __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] P3 Calibration help
New P3 Jockey here. It seems to work fine. I note however that when I have a CW signal zeroed on CWT [and with AUTO SPOT], it shows up just below the center line that has the correct frequency displayed on the K3. I think I need to download a new manual, the one that came with it is apparently a couple of FW revs old. Is there some sort of calibration process I'm supposed to do with the P3 Utility [which I just downloaded]? 73, Fred K6DGW - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] band switching
I use the quick memories, M1 - M2, and have a CW and SSB start frequency as recommended in the "Owner's Manual" on page 16 John __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] band switching
You might set up a frequency memory for somewhere in each of the ham bands and recall that memory. Some people assign a "quick" memory to each band. Dick, K6KR -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Karl Ahamer Sent: Sunday, September 11, 2011 5:25 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] band switching Hi all, I sometimes listen outside the ham bands to some broadcast station. Let's say on 13.500Mhz and then go to another ham band and then want to came back to the 20m band.Using the up/down controls it will come up with 13.500Mhz (the frequency used last on this band)so I have to tune all the way up to 14Mhz to be get back on the ham band.Is there a feature within the K3 menu which would make the K3 come back to the last used ham frequency on this band, rather than to the last used? 73' Karl VK2GKA K3,P3 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] band switching
Karl, No, but Direct Frequency Entry will put you on any frequency you want. 73, Don W3FPR On 9/11/2011 8:24 PM, Karl Ahamer wrote: > Hi all, > > I sometimes listen outside the ham bands to some broadcast station. > > Let's say on 13.500Mhz and then go to another ham band and then want to came > back to the 20m band.Using the up/down controls it will come up with > 13.500Mhz (the frequency used last on this band)so I have to tune all the > way up to 14Mhz to be get back on the ham band.Is there a feature within the > K3 menu which would make the K3 come back to the last used ham frequency on > this band, rather than to the last used? > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] band switching
Hi all, I sometimes listen outside the ham bands to some broadcast station. Let's say on 13.500Mhz and then go to another ham band and then want to came back to the 20m band.Using the up/down controls it will come up with 13.500Mhz (the frequency used last on this band)so I have to tune all the way up to 14Mhz to be get back on the ham band.Is there a feature within the K3 menu which would make the K3 come back to the last used ham frequency on this band, rather than to the last used? 73' Karl VK2GKA K3,P3 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] having enough radios
Holy Mackerel, Looks like NASA can have an alternate mission control at W9EVT's QSL. Thanks for the post! John Westmoreland AJ6BC On Wed, Sep 7, 2011 at 7:13 AM, Peter Wollan wrote: > It is possible to have enough rigs. > > > http://forums.qrz.com/showthread.php?311312-Washington-Island-s-Ham-Radio-Treasure > > Peter W0LLN > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] having enough radios
I have my Elecrafts K1 & K2/100, Ten-Tecs Jupiter & Argo V, a Patcomm PC-500... & my XYL thinks I'm nuts. We can eventually get a K3/100 in there too... Right? 73 de Bert WA2SI (3rd gen. law enforcement officer with prayer for all those who lost their lives, loved ones, and all who were affected by the tragic events ten years ago today.) - Original Message - From: "David Elliott" To: "Peter Wollan" Cc: "Elecraft Reflector" Sent: Sunday, September 11, 2011 6:03 PM Subject: Re: [Elecraft] having enough radios > No. > > The proper number of rigs is just one more. > > 73 de W6BK > > On Sep 7, 2011, at 7:13 AM, Peter Wollan wrote: > >> It is possible to have enough rigs. >> >> http://forums.qrz.com/showthread.php?311312-Washington-Island-s-Ham-Radio-Treasure >> >> Peter W0LLN >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] having enough radios
No. The proper number of rigs is just one more. 73 de W6BK On Sep 7, 2011, at 7:13 AM, Peter Wollan wrote: > It is possible to have enough rigs. > > http://forums.qrz.com/showthread.php?311312-Washington-Island-s-Ham-Radio-Treasure > > Peter W0LLN > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] K2/100 FS
Hi Bill, I am interested. Send pictures. How much are you asking? 73 Roy N5SWE ( I am on 75 meters every night, 3.970 Mgz at 04:00 - 05:00 Z ) _Judge31@aol.com_ (mailto:judg...@aol.com) (775)741 9352 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Elecraft SSB Net results (9/11/11)
We had a small net today with generally decent signal levels. Contest QRM was a bit of a problem at times. There was a little discussion about K3 AM filter bandwidths. The question was referred to the reflector. We had 14 participants over a 15 minute period. Have a great week. Here is the list of participants. Station NameQTH Rig S/N AE6IC FredCA K3 2241 WB6CLZ MikeCA K3 4522 K8EAG Gil MI K3 99 K0LUM David IA K3 3422 WJ0FLee AZ K3 5682 W0ZRTom MN K3 4886 W0RSR MikeCO K2 5767 KC5RY George TX K3 5208 W5PAR PaulAZ K3 275 W4RKS Jim AL K3 3618 W8OVDaveTX K3 3139 KK7PLyleWA K3 3036(Was that you Lyle?) KE5EFY Dwayne TX K3 5287 NS7PPhilOR K3 1826 73, Phil, NS7P __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] What your mother didn't tell you about transmission lines
A quick warning about actually using zip cord for feedline. The typical insulation material is NOT designed for RF transmission, usually for flexibility, color, durability taking the abuse that AC cords always take, etc. It is almost always some PVC based formulation. Zip cord has been famously LOSSY and wholly unsuitable for feedline. At one time I did see some Polyethylene (PE) zip cord which may have been pretty decent. I have constructed balanced feedline from tie-wrapped parallel teflon insulated #12 silvered copper wire that can be found on eBay from time to time. It seemed to measure a fairly reliable 84 ohms, and I have been able to use that and ladder line for QRO transmission line transformers that hold up well to Mother Nature. Just use the very small tie wraps (UV resistant stuff) to keep the two wires together every six inches or so. I did NOT twist the wire. 73, Guy On Sun, Sep 11, 2011 at 3:27 PM, Gary Hinson wrote: > Thanks guys. > > I've made open wire/ladder line before and will be doing so again for a > planned vee-beam array, but I've never tried twisted pair other than UTP > for > Ethernet (most people call it "Unshielded Twisted Pair" but I guess > "Unified" or "Uniform" would make sense too). > > Years ago I used copper zip cord/bellwire for make-shift portable dipoles > (just knotted the centre point to stop it all unzipping!) - worked well > enough with an outboard toroidal balun and ATU in the K2 for a few QSOs > while on holiday in the South of France. There were better things to do > than play radio! > > The 120 ohm impedance of zip cord should be a close-enough match for a > fullwave loop. > > 73, > Gary ZL2iFB > > > > -Original Message- > > From: elecraft-boun...@mailman.qth.net > > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jack Smith > > Sent: Monday, 12 September 2011 1:01 AM > > To: elecraft@mailman.qth.net > > Subject: Re: [Elecraft] What your mother didn't tell you > > about transmission lines > > > > A few years ago, I measured a length of plastic (some form of > > vinyl, I > > believe) insulated zip cord with the loss results below. > > > > Impedance over the range 300 KHz - 30 MHz varied from 118 > > ohms to 124 ohms. > > > > Jack K8ZOA > > > > > > Frequency MHz Loss (dB)/100 ft > > 5 2.3 > > 103.5 > > 154.6 > > 205.5 > > 256.9 > > 308.1 > > 358.7 > > 409.2 > > 4510.4 > > 5011.6 > > > > > > > > On 9/11/2011 8:20 AM, Bill W4ZV wrote: > > > Fred Townsend wrote: > > >> Rubber (parallel) lamp cord can be used as transmission > > line and it is > > >> cheap. Z0 runs 95 to 120 Ohms depending on insulation thickness. > > >> > > > True, but it has very high loss (especially at higher > > frequencies) and > > > should only be considered as a last resort. About 10 years > > ago ET3PMW was > > > attempting to get on the low bands and only had zip cord > > available for > > > transmission line. I thought it should work fine for 80 > > and 160. However, > > > on 80m running 100 watts he was barely detectible here using a 1200' > > > Beverage for receive. Once Paul got some good ladder line, > > his signal was > > > typically S8 on 80m and S6 on Topband, where he made > > several hundred QSOs > > > with North America even in summer QRN (June/July). > > > > > > There is a loss graph on page 2 below but I believe > > ET3PMW's losses were > > > much higher. Of course this could have been due to poor > > quality wire > > > available in Ethiopia. > > > > > > > > http://www.we0h.us/Amateur_Radio_stuff/Antenna/ZIP-Cord-Antenn > a/Zipcord-Antenna-7903031.pdf > > > > > > 73, Bill > > > > > > > > > -- > > > View this message in context: > > http://elecraft.365791.n2.nabble.com/What-your-mother-didn-t-t > ell-you-about-transmission-lines-tp6780383p6780644.html > > > Sent from the Elecraft mailing list archive at Nabble.com. > > > __ > > > Elecraft mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > > Help: http://mailman.qth.net/mmfaq.htm > > > Post: mailto:Elecraft@mailman.qth.net > > > > > > This list hosted by: http://www.qsl.net > > > Please help support this email list: http://www.qsl.net/donate.html > > > > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __
Re: [Elecraft] Heathkit Returns!
I bought a "gazillion" 10 megohm 1/4 watt resistors on sale once. They make wonderful "standoff insulators" soldered to a bit of copper PC board to support circuit elements. I find that it's very easy to "breadboard" a circuit that way. Ron AC7AC -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John Ragle Sent: Sunday, September 11, 2011 1:17 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Heathkit Returns! I would like to "second:" Don's comments about HB. Believe me, when I say I come from the "old school" WRT HB, but just trying a single "Manhatten [sic] construction" using chads punched from .065" circuit board with a "nibbler" and mounted with superglue on a ground plane was more than enough to convince me that it is really worthwhile GIVING UP the old methods using tie points/strips, hole punches on a chassis, etc. John Ragle -- W1ZI __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit Returns!
I would like to "second:" Don's comments about HB. Believe me, when I say I come from the "old school" WRT HB, but just trying a single "Manhatten [sic] construction" using chads punched from .065" circuit board with a "nibbler" and mounted with superglue on a ground plane was more than enough to convince me that it is really worthwhile GIVING UP the old methods using tie points/strips, hole punches on a chassis, etc. Take a gander at http://www.k8iqy.com/qrprigs/sw30+/PC010006_640.jpg or simply google "Manhattan style electronic construction." One can regard Manhattan-style construction as an organized version of Ugly-style, or as a 3-D representation of an edited PC board, preliminary to a full etched-board production model. However one thinks about it, it deserves MUCH better recognition as a replacement for pre-1960's methods. In case the chads from a nibbler are too small, I use an old Dremel tool with a cut-off tool that EASILY makes islands on larger pieces of circuit board. It is worth mentioning that there are several FREE programs available for PC-board design/editing, and that there are several CONUS companies that are willing to do small runs of PC boards for (what appear to me to be) reasonable cost, if one wants to go that far. With regard to Wayne's comments about "leaded components," the only down-side is that the shipping costs are likely to exceed the component costs, "if you're having only one." I have found that Newark and Allied are willing to ship in small quantity, as long as you can bear the shipping/handling costs. On the other hand, one should not overlook the fact that several outfits sell "grab bags" of goodies, akin to the old PolyPaks of floor sweepings.. To me, Manhattan style construction is psychedelic, and I am talking about HB, not smokin' boards..."mind-freeing." John Ragle -- W1ZI = On 9/11/2011 2:29 PM, Don Wilhelm wrote: > ...if you are doing "from scratch" homebrew, or following someone else's > schematic and doing your own physical layout, you will find Manhatten > construction can use your pick of either leaded or SMD components... __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 on RTTY
Good advice. I run my KPA500 with all the lights lit in all modes, including very aggressive RTTY contesting As noted, the fan speeds up with constant CQing, but never approaches maximum speed. I also run it this way for various WSJT modes, with the same performance. The wattmeter, which I have not calibrated on the HF bands, says I'm getting 650-700 watts. The amp is quite well protected. 73, Jim K9YC On 9/11/2011 8:38 AM, Richard Squire - HB9ANM wrote: > Yes, Bob, the fan will accelerate during an RTTY contest (or during long > transmissions in CW/SSB for that matter...) - this is normal. > If you set fan speed to 1 or 2 to start with (instead of NOR), you will > notice temperature rise will be substantially reduced - and much slower. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] What your mother didn't tell you about transmission lines
Thanks guys. I've made open wire/ladder line before and will be doing so again for a planned vee-beam array, but I've never tried twisted pair other than UTP for Ethernet (most people call it "Unshielded Twisted Pair" but I guess "Unified" or "Uniform" would make sense too). Years ago I used copper zip cord/bellwire for make-shift portable dipoles (just knotted the centre point to stop it all unzipping!) - worked well enough with an outboard toroidal balun and ATU in the K2 for a few QSOs while on holiday in the South of France. There were better things to do than play radio! The 120 ohm impedance of zip cord should be a close-enough match for a fullwave loop. 73, Gary ZL2iFB > -Original Message- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jack Smith > Sent: Monday, 12 September 2011 1:01 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] What your mother didn't tell you > about transmission lines > > A few years ago, I measured a length of plastic (some form of > vinyl, I > believe) insulated zip cord with the loss results below. > > Impedance over the range 300 KHz - 30 MHz varied from 118 > ohms to 124 ohms. > > Jack K8ZOA > > > Frequency MHz Loss (dB)/100 ft > 5 2.3 > 103.5 > 154.6 > 205.5 > 256.9 > 308.1 > 358.7 > 409.2 > 4510.4 > 5011.6 > > > > On 9/11/2011 8:20 AM, Bill W4ZV wrote: > > Fred Townsend wrote: > >> Rubber (parallel) lamp cord can be used as transmission > line and it is > >> cheap. Z0 runs 95 to 120 Ohms depending on insulation thickness. > >> > > True, but it has very high loss (especially at higher > frequencies) and > > should only be considered as a last resort. About 10 years > ago ET3PMW was > > attempting to get on the low bands and only had zip cord > available for > > transmission line. I thought it should work fine for 80 > and 160. However, > > on 80m running 100 watts he was barely detectible here using a 1200' > > Beverage for receive. Once Paul got some good ladder line, > his signal was > > typically S8 on 80m and S6 on Topband, where he made > several hundred QSOs > > with North America even in summer QRN (June/July). > > > > There is a loss graph on page 2 below but I believe > ET3PMW's losses were > > much higher. Of course this could have been due to poor > quality wire > > available in Ethiopia. > > > > > http://www.we0h.us/Amateur_Radio_stuff/Antenna/ZIP-Cord-Antenn a/Zipcord-Antenna-7903031.pdf > > > > 73, Bill > > > > > > -- > > View this message in context: > http://elecraft.365791.n2.nabble.com/What-your-mother-didn-t-t ell-you-about-transmission-lines-tp6780383p6780644.html > > Sent from the Elecraft mailing list archive at Nabble.com. > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit Returns!
Dave, Most parts to do "leaded component" HB are easily available, just look at Mouser or Digikey, or Newark or Allied, or many other major distributors. It is rare not to find what is needed. If you are working from an older parts list, you may encounter some difficulty in that the stated part numbers are not available - mostly because of the switch to ROHS compliance a few years ago. Many distributors changed their part numbers to be able to distinguish between the new RoHS compliant parts and the older non-compliant equivalents. You don't even need an etched PC board to do HB - just a piece of single or double sided PC board material will provide the platform for either Wes Hayward's (W7ZOI) 'Ugly construction' or Manhatten construction techniques - a good solid ground plane is produced with both these methods, so they are ideal for RF work, DIP or SMD ICs can be used, mounted either 'dead-bug' style (glued upside down on the board), or you can purchase "carrier boards" for these from QRPme, or make your own carrier boards from small pieces of PC board with a series of cuts with spacing to match the leads of the device. The nice thing about either ugly construction or Manhatten construction is that it lends itself to making changes in the design easily, so a lot of experimenting can be done at very low cost. Also with Manhatten construction, you can do a mix of SMD and leaded passive components if desired. Since SMD capacitors usually have lower lead inductance than leaded equivalents, it is easier to produce a repeatable design at VHF and/or UHF with those construction methods. Yes, more and more available small kit boards are being made available for SMD components, but if you are doing "from scratch" homebrew, or following someone else's schematic and doing your own physical layout, you will find Manhatten construction can use your pick of either leaded or SMD components, you get to decide. HB is not dead, and does not need to use SMD components. 73, Don W3FPR On 9/11/2011 12:15 PM, Dave KK7SS wrote: > Ed, > > I beg to differ on one point > >>> So SMT did not take it from hams - >>> the hams took HB out of hamradio. > In my opinion, what took the 'HB' out of Ham radio was the decline in > descrete parts that you could see and handle. > I think that the electronics industries ubiquitous use of SMTs, LSI's, GPA's > etc. caused the decline in demand in manufacturing of the more expensive and > labor intensive items like tubes, variable caps, resistors. etc. > > Add PCB's and flow soldering to the equation and it became no longer > cost-effective to manufacture parts for a relatively small private(?) market. > > 73 de > > -- > Dave G KK7SS > Richland, WA > > '59 Morris Minor 1000 - working on it.. > '65 Sprite - running with a bad valve guide :( > '76 Midget - co-owned with #4 Son :) > '06 Honda Civic Hybrid > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit Returns!
> I think the electronics industry's ubiquitous use of SMTs, LSI's, > GPA's etc. caused the decline in demand in manufacturing of the more > expensive and labor intensive items like tubes, variable caps, > resistors. etc. The demand for leaded parts may be lower, but don't count them out. We can still purchase all of the parts for our "full" kits without any trouble. That's hundreds of different leaded parts from dozens of vendors. (Our full kits include the K1, K2, KX1, transverters, and nearly all of our mini-modules and accessories.) Take through-hole ICs, for example: Digikey shows about 400 different 8-pin DIP dual op-amps in stock from 17 different manufacturers. They stock over 700 types of DIP-package Microchip PIC parts. The SA612AN 8- pin DIP oscillator/mixer found in many ham designs is carried by at least half a dozen vendors, with thousands in stock. "Interesting" I/O chips like the TI TPIC6595N 8-bit shift register/ peripheral driver are still widely available in DIP packages -- I counted 9 vendors for this part. Or how about a leaded, 10-K, 1/4-watt, 5% resistor? Digikey has well over 2 million in stock from three manufacturers. Finally, consider transistors. I found 21 stocking vendors for new 2N's, and there must be tens of millions of them available surplus. Digikey alone stocks 10 different kinds of TO-92 JFETs. Home brew with full-size parts lives on! 73, Wayne N6KR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit Returns!
Dave, You may not be able to buy much at the local Radio Shack, and there may not be any other local source for the components, but that doesn't mean that you and I cannot buy the parts needed to home-brew ham radio gear; even the PC Boards can be designed by a ham that's willing to take the time to learn how to design one, and have the boards made by a company that has the equipment to do it. Matthew Pitts N8OHU Sent from my Wireless Device -Original Message- From: Dave KK7SS Sender: elecraft-boun...@mailman.qth.net Date: Sun, 11 Sep 2011 16:15:41 To: elecraft_mailman.qth.net Subject: Re: [Elecraft] Heathkit Returns! Ed, I beg to differ on one point >> So SMT did not take it from hams - >> the hams took HB out of hamradio. In my opinion, what took the 'HB' out of Ham radio was the decline in descrete parts that you could see and handle. I think that the electronics industries ubiquitous use of SMTs, LSI's, GPA's etc. caused the decline in demand in manufacturing of the more expensive and labor intensive items like tubes, variable caps, resistors. etc. Add PCB's and flow soldering to the equation and it became no longer cost-effective to manufacture parts for a relatively small private(?) market. 73 de -- Dave G KK7SS Richland, WA '59 Morris Minor 1000 - working on it.. '65 Sprite - running with a bad valve guide :( '76 Midget - co-owned with #4 Son :) '06 Honda Civic Hybrid __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Heathkit Returns!
Ed, I beg to differ on one point >> So SMT did not take it from hams - >> the hams took HB out of hamradio. In my opinion, what took the 'HB' out of Ham radio was the decline in descrete parts that you could see and handle. I think that the electronics industries ubiquitous use of SMTs, LSI's, GPA's etc. caused the decline in demand in manufacturing of the more expensive and labor intensive items like tubes, variable caps, resistors. etc. Add PCB's and flow soldering to the equation and it became no longer cost-effective to manufacture parts for a relatively small private(?) market. 73 de -- Dave G KK7SS Richland, WA '59 Morris Minor 1000 - working on it.. '65 Sprite - running with a bad valve guide :( '76 Midget - co-owned with #4 Son :) '06 Honda Civic Hybrid __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] What your mother didn't tell you about transmission lines
I should make two points that may not have been apparent from my sarcasm in the subject line. 1. Zip cord is a last resort, not a first. 2. You still have to match the stuff and Z0 is a moving target. Matching can mean baluns on one or both ends. Was KPA500 RF output wiring: Gary there are several distinctions: First there is a difference between a jumper and a transmission line. For short distances you will have perturbations at the start and finish that will average out because you do not really establish the transmission line effect. Losses are usually insignificant. So to make a twisted pair put two insulated wires in your drill chuck and twist them together. Works great. Things get very different when the distance moves out. For twisted pair (TP) to be an effective transmission line the twist must be constant. This is called Unified Twist Pair (UTP) Examples of UTP are CAT5 and CAT6 cable. If you twist it yourself the twist will not be constant so you will get dispersion effects and other problems. Dispersion is usually not too big a problem at HF but it does cause phase noise. Rubber (parallel) lamp cord can be used as transmission line and it is cheap. Z0 runs 95 to 120 Ohms depending on insulation thickness. Z0, the surge impedance of coax runs 50 to 91 Ohms. (91 Ohm is pretty hard to work with because the center conductor is so thin.) Z0 runs 95 to 900 Ohms for twin lead but really widens out beyond 300 Ohms (AKA ladder line). The limits for both are determined by physics. You can push them but you can't change them so in short there is no such thing as 50 Ohm twin lead or 300 Ohm coax. Finally if you are making your own TP I suggest you use either Kynar or Teflon insulated wire. Both will be silver plated and have lower losses than copper. 73 Fred, AE6QL -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Gary Hinson Sent: Saturday, September 10, 2011 11:06 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 RF output wiring > Sure. Twisted pair is a VERY effective transmission line, and that is > what is needed ... Hey Jim, what kind of twisted pair could I use to feed my [mostly 50 ohm] HF antennas? Coax is expensive in ZL so I'm willing to try alternatives. I'm even thinking of homebrew balanced line with baluns at the bottom (a coax-fed remote antenna switch in my case). 73 Gary ZL2iFB __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 on RTTY
Yes, Bob, the fan will accelerate during an RTTY contest (or during long transmissions in CW/SSB for that matter...) - this is normal. If you set fan speed to 1 or 2 to start with (instead of NOR), you will notice temperature rise will be substantially reduced - and much slower. Good thing for the final transistors! This, by the way, was also recommended by Eric at Elecraft some time ago. 73 bobgarceau wrote: > > I noticed that the fan does accelerate when using HP on RTTY. > > Bob, W1EQ > - Richard - HB9ANM -- View this message in context: http://elecraft.365791.n2.nabble.com/KPA500-on-RTTY-tp6780759p6781019.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA500 on RTTY
Yes, the KPA500 runs cool at 500 watts all day long in a RTTY contest, as designed. Ed - W0YK Bob, W1EQ, asked: > Has anybody pushed the 500 limit on RTTY with the KPA500? > > Especially in a contest. > > I noticed that the fan does accelerate when using HP on RTTY. > > Just wondering how the amp would hold up under 400-500 watts > running on RTTY. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KPA500 on RTTY
Has anybody pushed the 500 limit on RTTY with the KPA500? Especially in a contest. I noticed that the fan does accelerate when using HP on RTTY. Just wondering how the amp would hold up under 400-500 watts running on RTTY. Bob, W1EQ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] What your mother didn't tell you about transmission lines
A few years ago, I measured a length of plastic (some form of vinyl, I believe) insulated zip cord with the loss results below. Impedance over the range 300 KHz - 30 MHz varied from 118 ohms to 124 ohms. Jack K8ZOA Frequency MHz Loss (dB)/100 ft 5 2.3 10 3.5 15 4.6 20 5.5 25 6.9 30 8.1 35 8.7 40 9.2 45 10.4 50 11.6 On 9/11/2011 8:20 AM, Bill W4ZV wrote: > Fred Townsend wrote: >> Rubber (parallel) lamp cord can be used as transmission line and it is >> cheap. Z0 runs 95 to 120 Ohms depending on insulation thickness. >> > True, but it has very high loss (especially at higher frequencies) and > should only be considered as a last resort. About 10 years ago ET3PMW was > attempting to get on the low bands and only had zip cord available for > transmission line. I thought it should work fine for 80 and 160. However, > on 80m running 100 watts he was barely detectible here using a 1200' > Beverage for receive. Once Paul got some good ladder line, his signal was > typically S8 on 80m and S6 on Topband, where he made several hundred QSOs > with North America even in summer QRN (June/July). > > There is a loss graph on page 2 below but I believe ET3PMW's losses were > much higher. Of course this could have been due to poor quality wire > available in Ethiopia. > > http://www.we0h.us/Amateur_Radio_stuff/Antenna/ZIP-Cord-Antenna/Zipcord-Antenna-7903031.pdf > > 73, Bill > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/What-your-mother-didn-t-tell-you-about-transmission-lines-tp6780383p6780644.html > Sent from the Elecraft mailing list archive at Nabble.com. > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] What your mother didn't tell you about transmission lines
Fred Townsend wrote: > > Rubber (parallel) lamp cord can be used as transmission line and it is > cheap. Z0 runs 95 to 120 Ohms depending on insulation thickness. > True, but it has very high loss (especially at higher frequencies) and should only be considered as a last resort. About 10 years ago ET3PMW was attempting to get on the low bands and only had zip cord available for transmission line. I thought it should work fine for 80 and 160. However, on 80m running 100 watts he was barely detectible here using a 1200' Beverage for receive. Once Paul got some good ladder line, his signal was typically S8 on 80m and S6 on Topband, where he made several hundred QSOs with North America even in summer QRN (June/July). There is a loss graph on page 2 below but I believe ET3PMW's losses were much higher. Of course this could have been due to poor quality wire available in Ethiopia. http://www.we0h.us/Amateur_Radio_stuff/Antenna/ZIP-Cord-Antenna/Zipcord-Antenna-7903031.pdf 73, Bill -- View this message in context: http://elecraft.365791.n2.nabble.com/What-your-mother-didn-t-tell-you-about-transmission-lines-tp6780383p6780644.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Switch mode PSU
Iain, I use a Power Mite from Walters & Stanton when not in the shack - is very quiet, both physically and RF wise 73 de M0XDF, K3 #174, P3 #108, KX3 #??? -- It came to me that reform should begin at home, and since that day I have not had time to remake the world. -Will Durant, historian (1885-1981) On 10 Sep 2011, at 22:58, Iain Haywood wrote: > Hi, > > Has anyone had any bad experiences using a K3 and a switch mode PSU?. > The SEC-1223 looks great aware some can cause problems.. > They say 'Totally noise free', that's some claim.. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] What your mother didn't tell you about transmission lines
Was KPA500 RF output wiring: Gary there are several distinctions: First there is a difference between a jumper and a transmission line. For short distances you will have perturbations at the start and finish that will average out because you do not really establish the transmission line effect. Losses are usually insignificant. So to make a twisted pair put two insulated wires in your drill chuck and twist them together. Works great. Things get very different when the distance moves out. For twisted pair (TP) to be an effective transmission line the twist must be constant. This is called Unified Twist Pair (UTP) Examples of UTP are CAT5 and CAT6 cable. If you twist it yourself the twist will not be constant so you will get dispersion effects and other problems. Dispersion is usually not too big a problem at HF but it does cause phase noise. Rubber (parallel) lamp cord can be used as transmission line and it is cheap. Z0 runs 95 to 120 Ohms depending on insulation thickness. Z0, the surge impedance of coax runs 50 to 91 Ohms. (91 Ohm is pretty hard to work with because the center conductor is so thin.) Z0 runs 95 to 900 Ohms for twin lead but really widens out beyond 300 Ohms (AKA ladder line). The limits for both are determined by physics. You can push them but you can't change them so in short there is no such thing as 50 Ohm twin lead or 300 Ohm coax. Finally if you are making your own TP I suggest you use either Kynar or Teflon insulated wire. Both will be silver plated and have lower losses than copper. 73 Fred, AE6QL -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Gary Hinson Sent: Saturday, September 10, 2011 11:06 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 RF output wiring > Sure. Twisted pair is a VERY effective transmission line, and that is > what is needed ... Hey Jim, what kind of twisted pair could I use to feed my [mostly 50 ohm] HF antennas? Coax is expensive in ZL so I'm willing to try alternatives. I'm even thinking of homebrew balanced line with baluns at the bottom (a coax-fed remote antenna switch in my case). 73 Gary ZL2iFB __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
