Re: [AMRadio] FS: RARE Zenith Trans-Oceanic Manual
Brian, I would like the Zenith if still avvailbble Thanks Healthfully yours, DON - Original Message - From: <[EMAIL PROTECTED]> To: ; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Sunday, October 23, 2005 7:18 AM Subject: [AMRadio] FS: RARE Zenith Trans-Oceanic Manual > FOR SALE: > Zenith Trans-Oceanic Operating Guide / Manual > Near mint condition. No marks. 16 Pages. > Includes beautiful pictures, tube chart, operation guide, > which includes instructions for 110V AC and battery operation, > world time zone map, clear channel station list, station log > and warranty. This is for the Model G500 but will apply just > fine to any Trans-Oceanic. Beige cover is in excellent shape too. > > Available for $12.00 plus shipping > > __ > 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 >
Re: [AMRadio] NCT12 fs/trade
It was apparently made by Collins for the navy. When I typed NCT12 into Google, I got a British website which showed a picture, and told me that it used a pair of 1625s in a push-pull modulator. I just got it yesterday, so haven't popped the case to see what else is inside.
Re: [AMRadio] NCT12 fs/trade
Mike Duke, K5XU wrote: I just acquired one of these transmitters in an equipment deal. It has no power supply, and probably hasn't been touched by human hands for at least 35 years until last Saturday. While I'd like to put it on the air myself, there's no telling when I'd get around to having it restored. So, if anyone is interested, make me an offer. Mike Duke, K5XU Who made this rig, Mike? Google isn't coughing up anything about an "NCT 12" transmitter -- 73 = Best Regards, -Geoff/W5OMR
[AMRadio] NCT12 fs/trade
I just acquired one of these transmitters in an equipment deal. It has no power supply, and probably hasn't been touched by human hands for at least 35 years until last Saturday. While I'd like to put it on the air myself, there's no telling when I'd get around to having it restored. So, if anyone is interested, make me an offer. Mike Duke, K5XU
Re: [AMRadio] Ladder-line mounting question
As John Coleman pointed out, the amount of power you will put into the line is important. Actually wood is not a good insulator. It contains a certain amount of water and when that is driven out rot will set up in the wood. By hanging the feed line on metal hooks screwed into wood will present a problem over the long haul. Check a farm supply store for ceramic insulators that have a screw in the middle. The are round in shape and have a notch in the top and bottom to allow wires to be supported without touching anything. Or get an eye screw and suspend a insulator of some type to the rafters then run the feed line through the insulators. Lexan strips, polycarbonate strips or something like that. Drill a hole in one end, tie it to the eye screw then make a hook on the other end for the feedline. 73 Jim W5JO - Original Message - From: "John Lawson" <[EMAIL PROTECTED]> To: Cc: <[EMAIL PROTECTED]> Sent: Sunday, October 23, 2005 11:30 AM Subject: [AMRadio] Ladder-line mounting question Just got my fence-perimeter NVIS loop installed yesterday (thanks to the kind slave-labor assistance of Brad, KB7FQR). I'm using 450-ohm feedline from the loop back to the tuner in the shack. It comes thru a hole in the shack wall and I had planned to suspend it along the rafters on those large 'bicycle hooks' for the 20 or so feet from the entry point over to where the Gear all lives. It has been suggested that this is a Not Good Thing - that any metallic object like that touching the ladder-line will alter the impedance, stress the insulation, etc. I can see the insulation concern, but I don't get how a pice of 3/8ths steel rod covered with plastic at right-angles to the feedline conductors can make much of an impedance bump. So I thought to solicit the general wisdom of those of us who might know the real 411 on this subject, because I'm not the brightest bulb in the marquee when it comes to HF antennae and feedlines. Cheers John KB6SCO
RE: [AMRadio] Ladder-line mounting question
Hi John, Why not just try your idea, see how the feed line/antenna performs? If you make the contacts desired, its a good antenna system and for a while the job is done. I doubt the bicycle hooks will adsorb/radiate much RF or change the impedance where a tuner can't handle the situation if all else has been designed within limits. Not having a picture of the installation, I can't see where drilling a hole through a 2X4, etc. and hanging the open wire with plastic wire ties would be any better. The proof is in eating the pudding. 73s wd8kdg Craig -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of John Lawson Sent: Sunday, October 23, 2005 9:30 AM To: amradio@mailman.qth.net Cc: [EMAIL PROTECTED] Subject: [AMRadio] Ladder-line mounting question Just got my fence-perimeter NVIS loop installed yesterday (thanks to the kind slave-labor assistance of Brad, KB7FQR). I'm using 450-ohm feedline from the loop back to the tuner in the shack. It comes thru a hole in the shack wall and I had planned to suspend it along the rafters on those large 'bicycle hooks' for the 20 or so feet from the entry point over to where the Gear all lives. It has been suggested that this is a Not Good Thing - that any metallic object like that touching the ladder-line will alter the impedance, stress the insulation, etc. I can see the insulation concern, but I don't get how a pice of 3/8ths steel rod covered with plastic at right-angles to the feedline conductors can make much of an impedance bump. So I thought to solicit the general wisdom of those of us who might know the real 411 on this subject, because I'm not the brightest bulb in the marquee when it comes to HF antennae and feedlines. Cheers John KB6SCO __ 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
RE: [AMRadio] Ladder-line mounting question
Hi John, Ed is correct. Better to be safe. The effect of an impedance bump is a relative thing. Higher frequencies are affected more. The position of the bump on the line will affect its size. Having a piece of metal near a low Z point on the tuned line will have less effect, perhaps none, than when it is at a high Z point. High and low Z points are found .25 wavelengths apart. A high Z point can be found by watching the SWR meter that is in the coax line (between the tuner and the XMTR) while moving a screw driver or other piece of metal (that has insulation over it so as not to short the Xmision lines) up and down the line. This type of testing generally requires two people, one to move the interfering object and the other to watch the meter. When the screw driver is near a low Z point it will have very little effect on the SWR meter but when it is over a high Z point the SWR meter will change a lot more. If there is very little difference from one point to the other, then it may be that you have "inadvertently" matched the load to the line. That's a joke because I have yet to accomplish this feat with out special pruning. At any rate, it will not be the same on all frequencies. Back in the days of the full 1KW input, I had a doublet up and feed with open wire line. I had the line dropping down from the antenna above the house and looping under the edge of the roof where it then came to the balance tuner which was mounted just under the edge of the roof and against the outside wall. The balance line was insulated #12 wires and laid against the composition shingles just at the edge of the roof. When I first hooked it all up, it worked fine, but when I turned up the Variac to run the full KW input I found the in about 30 seconds the transmitter was out of resonance. The SWR meter was on the pin. I reduced the voltage and retuned the tuner outside and all was well again. About 30 seconds after I increased the power it started drifting out of tune. This time I inspected the antenna and Xmision line to find that the line had melted the roofing material where it past over the edge and was now 1 to 2 inches embedded into it and lying against the roof edge flashing. I placed a piece of Plexiglas under the shingles and notched the outside edge of the plastic to hold the line wires in place, spacing them about 4-5 inches away from the roof. The tuning then was stable. John, WA5BXO -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Edward B Richards Sent: Sunday, October 23, 2005 12:06 PM To: amradio@mailman.qth.net Cc: amradio@mailman.qth.net; [EMAIL PROTECTED] Subject: Re: [AMRadio] Ladder-line mounting question Just to be safe why not suspend the ladder line with long plastic cable ties? This will keep it at least 6 inches from any metal. Good Luck. 73, Ed K6UUZ On Sun, 23 Oct 2005 12:30:20 -0400 (EDT) John Lawson <[EMAIL PROTECTED]> writes: > > >Just got my fence-perimeter NVIS loop installed yesterday (thanks > to > the kind slave-labor assistance of Brad, KB7FQR). I'm using 450-ohm > > feedline from the loop back to the tuner in the shack. It comes thru > a > hole in the shack wall and I had planned to suspend it along the > rafters > on those large 'bicycle hooks' for the 20 or so feet from the entry > point > over to where the Gear all lives. > > It has been suggested that this is a Not Good Thing - that any > metallic > object like that touching the ladder-line will alter the impedance, > stress > the insulation, etc. > >I can see the insulation concern, but I don't get how a pice of > 3/8ths > steel rod covered with plastic at right-angles to the feedline > conductors > can make much of an impedance bump. > >So I thought to solicit the general wisdom of those of us who > might know > the real 411 on this subject, because I'm not the brightest bulb in > the > marquee when it comes to HF antennae and feedlines. > > > > Cheers > > John KB6SCO > __ > 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 > > __ 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
Re: [AMRadio] Ladder-line mounting question
Just to be safe why not suspend the ladder line with long plastic cable ties? This will keep it at least 6 inches from any metal. Good Luck. 73, Ed K6UUZ On Sun, 23 Oct 2005 12:30:20 -0400 (EDT) John Lawson <[EMAIL PROTECTED]> writes: > > >Just got my fence-perimeter NVIS loop installed yesterday (thanks > to > the kind slave-labor assistance of Brad, KB7FQR). I'm using 450-ohm > > feedline from the loop back to the tuner in the shack. It comes thru > a > hole in the shack wall and I had planned to suspend it along the > rafters > on those large 'bicycle hooks' for the 20 or so feet from the entry > point > over to where the Gear all lives. > > It has been suggested that this is a Not Good Thing - that any > metallic > object like that touching the ladder-line will alter the impedance, > stress > the insulation, etc. > >I can see the insulation concern, but I don't get how a pice of > 3/8ths > steel rod covered with plastic at right-angles to the feedline > conductors > can make much of an impedance bump. > >So I thought to solicit the general wisdom of those of us who > might know > the real 411 on this subject, because I'm not the brightest bulb in > the > marquee when it comes to HF antennae and feedlines. > > > > Cheers > > John KB6SCO > __ > 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 > >
[AMRadio] Ladder-line mounting question
Just got my fence-perimeter NVIS loop installed yesterday (thanks to the kind slave-labor assistance of Brad, KB7FQR). I'm using 450-ohm feedline from the loop back to the tuner in the shack. It comes thru a hole in the shack wall and I had planned to suspend it along the rafters on those large 'bicycle hooks' for the 20 or so feet from the entry point over to where the Gear all lives. It has been suggested that this is a Not Good Thing - that any metallic object like that touching the ladder-line will alter the impedance, stress the insulation, etc. I can see the insulation concern, but I don't get how a pice of 3/8ths steel rod covered with plastic at right-angles to the feedline conductors can make much of an impedance bump. So I thought to solicit the general wisdom of those of us who might know the real 411 on this subject, because I'm not the brightest bulb in the marquee when it comes to HF antennae and feedlines. Cheers John KB6SCO
[AMRadio] FS: RARE Zenith Trans-Oceanic Manual
FOR SALE: Zenith Trans-Oceanic Operating Guide / Manual Near mint condition. No marks. 16 Pages. Includes beautiful pictures, tube chart, operation guide, which includes instructions for 110V AC and battery operation, world time zone map, clear channel station list, station log and warranty. This is for the Model G500 but will apply just fine to any Trans-Oceanic. Beige cover is in excellent shape too. Available for $12.00 plus shipping
