Re: [AMRadio] Legal-Limit tuner advice....?
In a message dated 1/12/06 8:31:16 AM, [EMAIL PROTECTED] writes: On Wed, 11 Jan 2006, [EMAIL PROTECTED] wrote: Quick and dirty, just try grounding one side of your ladder-line at the input end and feeding the other side off the single ended output of your ATU and see what happens. SWR figures might be better (but could also be worse). John, Did you ever try this? If so, what were the results? Dennis D. W7QHO Glendale, CA
Re: [AMRadio] Legal-Limit tuner advice....?
On Fri, 18 Aug 2006, [EMAIL PROTECTED] wrote: In a message dated 1/12/06 8:31:16 AM, [EMAIL PROTECTED] writes: On Wed, 11 Jan 2006, [EMAIL PROTECTED] wrote: Quick and dirty, just try grounding one side of your ladder-line at the input end and feeding the other side off the single ended output of your ATU and see what happens.?? SWR figures might be better (but could also be worse). John, Did you ever try this? If so, what were the results? Yes, I did - results not good at all, antenna would not tune and the Transmitter complained at me bitterly... ;} I also built in a DPDT knife switch in the feedline after the tuner - it's mainly for grounding during t-storms, but I played around with various (semi-calculated) values of capacitors and coils... on 10 meters the use of various paralelled caps made improvements, but tuning became very critical, and there's nothing much that interests me up there - I *do* like to work 20M RTTY , and have yet to try PSK32 into the Valiant. I'm still gathering facts, and the Listmembers have been quite helpful - everyone likes the Palstars, but the big Ten-Tec also has impressive specs I intend on converting a broadcast transmitter for use in the shack, so the Tuner needs to be able to withstand 100% duty-cycle at Legal Limit. Ultimately I'll tune the feedpoint of the antenna itself, and just run 50-ohm line from the transmitter out to the doghouse if you will. Cheers John KB6SCO Who just shut the rigs off after a nice AM QSO on 80
RE: [AMRadio] Legal-Limit tuner advice....?
Keep in mind that while the T tuners can match a wider range they also can be mis-tuned into a mode where a lot of power is consumed in the coil yet all looks good. This can't happen in a PI network for instance. It's a good reason to have one or more RF ammeters around for monitoring your antenna current. I prefer a link-coupled tuner like the MB for balanced loads, a parallel type tuner for end-fed wires and such, and a PI for coax-fed antennas. I can tune my Zepp from 80-10 including WARC bands with the MB. For 160 I can feed it as a T through a special link-matcher. You'll find many different opinions except that I think everyone agrees the MFJ tuners are very cheaply made. I have a 949 that I don't use that much... it's got flimsy components in it. Fine for say 100W I guess but no more. The switches feel flimsy too when you rotate them. I wouldn't recommend one that's for sure. 73, Mark W1EOF -Original Message- From: John Lawson [mailto:[EMAIL PROTECTED] Sent: Friday, August 18, 2006 12:52 AM To: [EMAIL PROTECTED] Cc: amradio@mailman.qth.net Subject: Re: [AMRadio] Legal-Limit tuner advice? On Fri, 18 Aug 2006, [EMAIL PROTECTED] wrote: In a message dated 1/12/06 8:31:16 AM, [EMAIL PROTECTED] writes: On Wed, 11 Jan 2006, [EMAIL PROTECTED] wrote: Quick and dirty, just try grounding one side of your ladder-line at the input end and feeding the other side off the single ended output of your ATU and see what happens. SWR figures might be better (but could also be worse). John, Did you ever try this? If so, what were the results? Yes, I did - results not good at all, antenna would not tune and the Transmitter complained at me bitterly... ;} I also built in a DPDT knife switch in the feedline after the tuner - it's mainly for grounding during t-storms, but I played around with various (semi-calculated) values of capacitors and coils... on 10 meters the use of various paralelled caps made improvements, but tuning became very critical, and there's nothing much that interests me up there - I *do* like to work 20M RTTY , and have yet to try PSK32 into the Valiant. I'm still gathering facts, and the Listmembers have been quite helpful - everyone likes the Palstars, but the big Ten-Tec also has impressive specs I intend on converting a broadcast transmitter for use in the shack, so the Tuner needs to be able to withstand 100% duty-cycle at Legal Limit. Ultimately I'll tune the feedpoint of the antenna itself, and just run 50-ohm line from the transmitter out to the doghouse if you will. Cheers John KB6SCO Who just shut the rigs off after a nice AM QSO on 80
[AMRadio] Thanks for Tuner Advice!
The majority of folks seem to like the Palstar products an awful lot and there were a few Ten-Tec plugs, too. I think I'll end up with the 2 or 3 KW model of one or the other - just have to do some more investigating - I'm mostly concerned with the ability to handle continuous power into a widely-varying antenna impedance. And as I said, eventually I'll put together an automatically-controlled unit that will tune the feedpoint of the antenna and still present a fairly constant impedance to the feedline... and be able to pass a 'real' kilowatt in the process. I've got the big roller inductors for that, finding capacitors is next, then the sensors, stepper motors, and controls, etc just no time right now for such a project. Thanks again to all who gave their opinions and advice! Cheers John KB6SCO
RE: [AMRadio] Thanks for Tuner Advice!
The majority of folks seem to like the Palstar products an awful lot and there were a few Ten-Tec plugs, too. I think I'll end up with the 2 or 3 KW model of one or the other - Compared to this either of those are wimps :-) https://home.comcast.net/~w1ia/100_0902.JPG Grant/NQ5T
RE: [AMRadio] Legal-Limit tuner advice....?
That's ODD: I've always found it to be a problem the other way around. Where they don't like to match low Z such as 100 Ohms or lower. but it can be a problem at higher Z if the feed point is reactive where the total length of the ant and the feed line do not come out close to a quarter wave multiple at the High Z length. My experience is mostly on 80, 40 mtrs. I used a dipole of 120 ft. center fed with 60 feet of 600 ohms line made with #12 wire and spaced about 6 inches. The voltage and Z for the feed point was about as high as it gets at that point, maybe 5000 ohms. The arc pulled from the feed point of the Matchbox tuner was about the same as the arc from plate end of the tank coil in the rig. As a mater of fact, the feeders needed to be pulled away from the composition roof edge just before going to the tuner mounted under the edge of the roof, to prevent dialectic heating and melting of the composition roof material. So I know the Voltage was high. John, WA5BXO -Original Message- On Behalf Of uvcm inc. Sent: Thursday, August 17, 2006 10:27 PM I have a Johnson kw matchbox, it is very limited if the impedance goes above 1000 ohms. It will not match my double extended zepp below 2:5:1 I am going to build one as soon as I decide on a very good design using vacuum caps Brad KB7FQR
[AMRadio] FS: Rechargeable Batteries
FOR SALE: Rechargeable Batteries - sealed lead-acid 12V batteries. These have seen light duty and been removed from service after several months. Still working fine. Great for QRP or portable operation. QTY 2 - YUASA 12V DC at 17.2 AH Dimensions: 7 X 3 X 7 tall Available for $24.00 each plus shipping QTY 3 - 12V DC at 12 AH Unipower Dimensions: 6 X 3-7/8 X 3-3/4 tall. Available for $16.00 each plus shipping QTY 1 - 12V DC at 14 AH PBS Brand Dimensions: 6 X 4 X 4 tall. Available for $16.00 plus shipping. QTY 1 - Ohmeda - 12V at 2.3 AH - $3.00 QTY 2 - UNIPOWER 6 V at 2.8 AH - $2.00 each Thanks for reading 73 - Brian
RE: [AMRadio] Thanks for Tuner Advice!
Grant wrote: Compared to this either of those are wimps :-) https://home.comcast.net/~w1ia/100_0902.JPG; Now, THAT is a real man's tuner! Perfect match for the transmitter that has a tube with handles! 73 - K4MO
[AMRadio] Hardware for potentiometer
Ok so I found myself with out enough hardware. I have a 100K dual audio taper pot from Radio Shack and I lost the nut. It is one for mounting in a 5/16 hole so I assume it is a 5/16 treaded sleeve with a 1/4 inch shaft but I can't find any hardware for it. Now I could just go buy another pot with hardware but after looking I find that I have other pots with no hardware and some of them are the same sleeve. I have hardware for the bigger pots. I guess you might say the standards. Searching Google comes up with no hardware except for at Electronic Goldmine, where I bough a bunch that are to large. Who makes this stuff, some far east company, and they secretly ship them to Switchcraft and other manufactures of potentiometers. John, WA5BXO
Re: [AMRadio] Hardware for potentiometer
Hi John, Check out McMaster-Carr, www.mcmaster.com - you can't believe their stock and selection. Bacon, WA3WDR - Original Message - From: John E. Coleman (ARS WA5BXO) [EMAIL PROTECTED] To: [EMAIL PROTECTED]; 'Discussion of AM Radio' amradio@mailman.qth.net Sent: Friday, August 18, 2006 2:29 PM Subject: [AMRadio] Hardware for potentiometer Ok so I found myself with out enough hardware. I have a 100K dual audio taper pot from Radio Shack and I lost the nut. It is one for mounting in a 5/16 hole so I assume it is a 5/16 treaded sleeve with a 1/4 inch shaft but I can't find any hardware for it. Now I could just go buy another pot with hardware but after looking I find that I have other pots with no hardware and some of them are the same sleeve. I have hardware for the bigger pots. I guess you might say the standards. Searching Google comes up with no hardware except for at Electronic Goldmine, where I bough a bunch that are to large. Who makes this stuff, some far east company, and they secretly ship them to Switchcraft and other manufactures of potentiometers. John, WA5BXO __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
Re: [AMRadio] Hardware for potentiometer
If you find a good source you could start a business...maybe call it The Nut Case! hi Tom K3TVC - Original Message - From: John E. Coleman (ARS WA5BXO) [EMAIL PROTECTED] To: [EMAIL PROTECTED]; 'Discussion of AM Radio' amradio@mailman.qth.net Sent: Friday, August 18, 2006 2:29 PM Subject: [AMRadio] Hardware for potentiometer Ok so I found myself with out enough hardware. I have a 100K dual audio taper pot from Radio Shack and I lost the nut. It is one for mounting in a 5/16 hole so I assume it is a 5/16 treaded sleeve with a 1/4 inch shaft but I can't find any hardware for it. Now I could just go buy another pot with hardware but after looking I find that I have other pots with no hardware and some of them are the same sleeve. I have hardware for the bigger pots. I guess you might say the standards. Searching Google comes up with no hardware except for at Electronic Goldmine, where I bough a bunch that are to large. Who makes this stuff, some far east company, and they secretly ship them to Switchcraft and other manufactures of potentiometers. John, WA5BXO __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
[AMRadio] Nuts to you
J. How many u want??klc - Original Message - From: John E. Coleman (ARS WA5BXO) [EMAIL PROTECTED] Date: Friday, August 18, 2006 2:33 pm Subject: [AMRadio] Hardware for potentiometer To: [EMAIL PROTECTED], 'Discussion of AM Radio' amradio@mailman.qth.net I have a 100K dual audio taper pot from Radio Shack and I lost the nut.
RE: [AMRadio] Hardware for potentiometer
Maybe I could manufacture nuts for pots, and those hard to find fixed carbon 4 watt resistors, and sell homemade jam on the side. Probably do about as well as I do now! If I could get folks to return the jars from the jam then I would not need transportation fuel to purchase new ones. HIHI John -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, August 18, 2006 2:26 PM To: Discussion of AM Radio Subject: Re: [AMRadio] Hardware for potentiometer If you find a good source you could start a business...maybe call it The Nut Case! hi Tom K3TVC - Original Message - From: John E. Coleman (ARS WA5BXO) [EMAIL PROTECTED] To: [EMAIL PROTECTED]; 'Discussion of AM Radio' amradio@mailman.qth.net Sent: Friday, August 18, 2006 2:29 PM Subject: [AMRadio] Hardware for potentiometer Ok so I found myself with out enough hardware. I have a 100K dual audio taper pot from Radio Shack and I lost the nut. It is one for mounting in a 5/16 hole so I assume it is a 5/16 treaded sleeve with a 1/4 inch shaft but I can't find any hardware for it. Now I could just go buy another pot with hardware but after looking I find that I have other pots with no hardware and some of them are the same sleeve. I have hardware for the bigger pots. I guess you might say the standards. Searching Google comes up with no hardware except for at Electronic Goldmine, where I bough a bunch that are to large. Who makes this stuff, some far east company, and they secretly ship them to Switchcraft and other manufactures of potentiometers. John, WA5BXO __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
RE: [AMRadio] Nuts to you
1 or 2 for now --- up to 10-20 for the future. John, WA5BXO -Original Message- On Behalf Of [EMAIL PROTECTED] J. How many u want??klc - Original Message - From: John E. Coleman (ARS WA5BXO) [EMAIL PROTECTED] Date: Friday, August 18, 2006 2:33 pm Subject: [AMRadio] Hardware for potentiometer To: [EMAIL PROTECTED], 'Discussion of AM Radio' amradio@mailman.qth.net I have a 100K dual audio taper pot from Radio Shack and I lost the nut. __ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
[AMRadio] Recommendation for Crystals
Just got off the phone with Mel, the owner of MH Electronics. Would you believe that he has been in the crystal business for well over 50 years. He is a young 80ish gentleman who can assist you with your crystal needs. Back in the 50's, when he worked for Midland, he made crystals for Collins Radio. http://www.mhelectronics.com/contactus.shtml Dave, W3ST Publisher of the Collins Journal Secretary to the Collins Radio Association www.collinsra.com - the CRA Website Now with PayPal CRA Nets: 3805 Khz every Monday at 8 PM EST and 14255 every Saturday at 12 Noon EST
[AMRadio] FS: Drake R4
Please reply off list. [EMAIL PROTECTED] I have for sale a Drake R4 receiver. It is in excellent physical and electrical condition. Chassis is tarnish free. Cabinet and front panel are excellent also. Comes with standard xtals plus one for 160 meters. Copy of manual included. No mods. $275 shipped conus. $250 if picked up. Chuck.wa2onk
RE: [AMRadio] Hardware for potentiometer
I knew a guy many years ago that produced pot for nuts. I think that's different. This was back in the day when HLR and EKV would be on 3885 and right after they signed you'd hear Led Zeppelin come blasting throuh the radio. 73, Mark W1EOF WN1PWA/WA1PWA at the time. -Original Message- From: John E. Coleman (ARS WA5BXO) [mailto:[EMAIL PROTECTED] Sent: Friday, August 18, 2006 4:22 PM To: 'Discussion of AM Radio' Subject: RE: [AMRadio] Hardware for potentiometer Maybe I could manufacture nuts for pots, SNIP
