Re: [Elecraft] Big antenna - Collins 13 ele Log?
dBi or dBd? If dBi not impressive. My 20m antenna produces 19 dBi and it´s by no means IMO very big, just a 5 over 5 yagi stack. 73 Jim SM2EKM --- Phil Kane wrote: The 17 dB gain of a rhombic is hard to beat. All the commercial HF point-to-point stations used them, as did a lot ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
On Thu, 27 Sep 2007 08:41:24 +0200, Jan Erik Holm wrote: dBi or dBd? If dBi not impressive. My 20m antenna produces 19 dBi and it_s by no means IMO very big, just a 5 over 5 yagi stack. dBd. A 5-over-5 is a more complex antenna than a rhombic, which consists of poles, wire, insulators, and a terminating resistor on some designs. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
I know the FAA facility out on Long Island has a large periodic antenna on a tower. Not too high up. I have seen similar antennas on other government and non-government agencies I have run across in my travels. I was doing some work at the US-West / Qwest labs in southwest Denver, and noticed some nice big antennas on its roof. Assumed it was a club station, but was not able to find out about it during my two weeks there. David Wilburn [EMAIL PROTECTED] K4DGW K2 #5982 FP#-1751 Darwin, Keith wrote: What is the biggest antenna you've ever used? In the mid 80's I had access to a 13 element log periodic that covered 40 -10 meters. It was 200 feet above ground. The club station had a Henry amp to drive it. Man, what a signal! Anyone know anything about this antenna? I know it was made by Collins and was apparently designed for military use. At 10,000 lbs, it sure was big! - Keith N1AS - - K2 5411.ssb.100 - ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
On Wed, 26 Sep 2007 05:57:24 -0700, Darwin, Keith wrote: In the mid 80's I had access to a 13 element log periodic that covered 40 -10 meters. It was 200 feet above ground. The club station had a Henry amp to drive it. Man, what a signal! Anyone know anything about this antenna? I know it was made by Collins and was apparently designed for military use. At 10,000 lbs, it sure was big! That was the standard US military HF antenna. In spite of its size, it didn't have that much gain but it was flat across the HF spectrum and could take a lot of power. About 20 years ago my former Federal employer had a chance to get one of those for free from an AF Reserve unit that was decommissioned. We would have had to take it down, move it about 2 miles through city streets, and re-erect it, at a cost of about $25K just in labor for licensed riggers. Our budget people couldn't come up with the money, so some other Federal or State agency got it. Would have been nice. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
Dave (et al): I pass that large array (at the FAA, LI MacArthur Airport) every day on the way to work. I have been wondering for years how to get my K2 hooked up to it. I have friends who work there, but alas, they have no good connections..hi. 73 Ken WB2ART David Wilburn wrote: I know the FAA facility out on Long Island has a large periodic antenna on a tower. Not too high up. I have seen similar antennas on other government and non-government agencies I have run across in my travels. I was doing some work at the US-West / Qwest labs in southwest Denver, and noticed some nice big antennas on its roof. Assumed it was a club station, but was not able to find out about it during my two weeks there. David Wilburn [EMAIL PROTECTED] K4DGW K2 #5982 FP#-1751 Darwin, Keith wrote: What is the biggest antenna you've ever used? In the mid 80's I had access to a 13 element log periodic that covered 40 -10 meters. It was 200 feet above ground. The club station had a Henry amp to drive it. Man, what a signal! Anyone know anything about this antenna? I know it was made by Collins and was apparently designed for military use. At 10,000 lbs, it sure was big! - Keith N1AS - - K2 5411.ssb.100 - ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
Keith Darwin asked What is the biggest antenna you've ever used? Not on the ham bands (although a couple of times we did get on the ham bands to communicate with a vessel in distress) the 524s and 527-2-Ns (if memory serves correctly) were used for directional and 505-1-Ns for omni-directional, with 10KW Collins transmitters, at the Coast Guard Communication Station in Virginia. There was also a rotatable LPA but I don't recall the designation. The receiver site, which was about 20 miles away, used the 505s, 612/625 loop arrays, and a rotatable LPA. The LPAs covered 4-30 MHz. I spent 4 of my 23 Coastie years at this station. http://www.antenna.be/tci-52427.pdf http://www.antenna.be/tci-5056.pdf http://www.tcibr.com/entry.asp?PageID=185 73, Sam, KL7V ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
Ken Kaplan wrote: Dave (et al): I pass that large array (at the FAA, LI MacArthur Airport) every day on the way to work. I have been wondering for years how to get my K2 hooked up to it. I have friends who work there, but alas, they have no good connections..hi. 73 Ken WB2ART Those things have been around for decades. There was one on top of the WW2 wooden hangar at Galena AFS AK [KL7FBK] when I first arrived in early 1963. They are impressive to see, extremely wide bandwidth [most of the HF spectrum] but not much gain. Huge rotator, and somewhat hard to aim because of the large moment of inertia. However, F/B ratio was also low so precise aiming wasn't needed. The basic idea behind a log-periodic is that only a couple of elements are active on any given frequency, so electrically, they're not nearly a big as they look. You could hook it to your K2, but you'd be disappointed. The military ran engineered circuits, and the flat response was the reason the L-P's were so ubiquitous on military posts. From Galena, we generally checked into an early morning weather net [on 20 I think], and the 3 el tribander was much better than the L-P. 73, Fred K6DGW - Northern California Contest Club - CU in the 2007 CQP Oct 6-7 - www.cqp.org ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
Darwin, Keith wrote: What is the biggest antenna you've ever used? A few years back I was active member in a local ham club which held its meetings at the old MARS station at Fort Monmouth, NJ., (K2USA) A couple of times we connected my K2 to the full size rhombic. Even on 40m ssb we were getting 20-30 over 9 reports from Europe with my power set at 10 wattsworked even better on cw at 5 watts. The antenna makes a big difference. Rich k2cpe K2 1102 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
I've operated 2 meter moonbounce at the Stanford/SRI 150' Big Dish. The SRI WARF OTH-R transmit site had two vertical arrays consisting of 18 FTM (folded-tilted-monopole) elements looking East and 18 TCI LP elements looking West equally spaced over a 205m base line. The arrays had a 6deg azimuthal beamwidth, steerable +/- 32 deg in 4 deg steps. This was a real band opener on 20 meters!! Doug, W6JD -- Original message -- From: Sam Binkley [EMAIL PROTECTED] Keith Darwin asked What is the biggest antenna you've ever used? Not on the ham bands (although a couple of times we did get on the ham bands to communicate with a vessel in distress) the 524s and 527-2-Ns (if memory serves correctly) were used for directional and 505-1-Ns for omni-directional, with 10KW Collins transmitters, at the Coast Guard Communication Station in Virginia. There was also a rotatable LPA but I don't recall the designation. The receiver site, which was about 20 miles away, used the 505s, 612/625 loop arrays, and a rotatable LPA. The LPAs covered 4-30 MHz. I spent 4 of my 23 Coastie years at this station. http://www.antenna.be/tci-52427.pdf http://www.antenna.be/tci-5056.pdf http://www.tcibr.com/entry.asp?PageID=185 73, Sam, KL7V ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
On Wed, 26 Sep 2007 14:43:02 -0400, Rich Ardolino wrote: A few years back I was active member in a local ham club which held its meetings at the old MARS station at Fort Monmouth, NJ., (K2USA) A couple of times we connected my K2 to the full size rhombic. Even on 40m ssb we were getting 20-30 over 9 reports from Europe with my power set at 10 wattsworked even better on cw at 5 watts. The antenna makes a big difference. The 17 dB gain of a rhombic is hard to beat. All the commercial HF point-to-point stations used them, as did a lot of government agencies for p-to-p circuits. Before the advent of satellite circuits, the TV station serving ElCentro, CA / Yuma, AZ picked up the CBS network feed from Channel 2 in Los Angeles with a huge 50 MHz rhombic. Not bad for 6-meter band antenna !! I think that a good rhombic hooked to a K2 would really throw an impressive signal! -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Big antenna - Collins 13 ele Log?
On Wed, 26 Sep 2007 19:19:45 +, [EMAIL PROTECTED] wrote: I've operated 2 meter moonbounce at the Stanford/SRI 150' Big Dish. The SRI WARF OTH-R transmit site had two vertical arrays consisting of 18 FTM (folded-tilted-monopole) elements looking East and 18 TCI LP elements looking West equally spaced over a 205m base line. The arrays had a 6deg azimuthal beamwidth, steerable +/- 32 deg in 4 deg steps. This was a real band opener on 20 meters!! I do remember those antennas, visible from I-280 and Skyline Drive (Palo Alto, CA). Our radio club visited the Dish about 10 years ago after the ownership passed from DoD to Stanford. Very impressive. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
