Re: [Elecraft] Fwd: Establishing A New Station
Loops are touchy by nature and you have to be very sensitive to the surroundings-metals, bodies (yes your body in close proximity will affect tuning). I use a small antenna analyzer to get it close and sometimes I have to adjust and step away from the antenna,take a reading and readjust I then follow up with adjustments with the radio connected for maximum band noise Also it needs to be a minimum of one diameter of the loop above ground,and more is better within reason. Is there a close ceiling that limits the height of the loop? Getting it in the clear is important,although with patience I’ve made contacts even indoors. Pick the bands carefully for propagation and as mentioned earlier tune for resonance. I’m strictly a QRP CW guy (5W Max) and have had good results by carefully adjusting to the surroundings and conditions. I have 2 loops-the AlexLoop and the W4OP. AlexLoop is good for 20 M and up while the W4OP is very efficient at 30,40 and 60 M. It’s very well made and an excellent design,although not the best option for backpacking as it’s a bit heavier. Dan Presley 503-701-3871 danpresley@me. com n7...@arrl.net > On May 14, 2020, at 19:21, Phil Kane wrote: > > >> On 5/13/2020 12:42 PM, brianchapn...@rogers.com wrote: >> >> Im thinking of a loop. I've had good luck with them. Any thoughts? > > I've been using a loop on the porch of our ground level apartment. At > 15 watts. It is useless - can't get it to tune properly and I often > think that I would have a better signal with my dummy load at 100 watts. > If you are getting good luck you must be doing something right. At > east you have the advantage of 34 stories - good for you. > > 73 de K2ASP - Phil Kane > Elecraft K2/100 s/n 5402 > > From a Clearing in the Silicon Forest > Beaverton (Washington County) Oregon > __ > 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 > Message delivered to n7...@arrl.net __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Fwd: Establishing A New Station
Actually, tune for resonance, not 1:1 SWR. Loops tend to be 50 Ω, but that isn’t the right measurement. Luckily, tuning for maximum noise is the same as tuning for resonance. wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On May 14, 2020, at 7:36 PM, Fred Jensen wrote: > > Small mag loops can be effective antennas if you can't put up 5 over 5 over > 5. One caveat: They are resonant transformers and the loop MUST be exactly > resonant at your QRG. This means, bypass any ATU and tune the loop [only] for > 1:1 SWR. Using the "get it close and let the ATU match it" scheme will lead > to a round, fairly pricey dummy load. > > 73, > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > On 5/14/2020 7:19 PM, Phil Kane wrote: >> On 5/13/2020 12:42 PM, brianchapn...@rogers.com wrote: >> >>> Im thinking of a loop. I've had good luck with them. Any thoughts? >> I've been using a loop on the porch of our ground level apartment. At >> 15 watts. It is useless - can't get it to tune properly and I often >> think that I would have a better signal with my dummy load at 100 watts. >> If you are getting good luck you must be doing something right. At >> east you have the advantage of 34 stories - good for you. >> >> 73 de K2ASP - Phil Kane >> Elecraft K2/100 s/n 5402 >> > > __ > 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 > Message delivered to wun...@wunderwood.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Fwd: Establishing A New Station
Small mag loops can be effective antennas if you can't put up 5 over 5 over 5. One caveat: They are resonant transformers and the loop MUST be exactly resonant at your QRG. This means, bypass any ATU and tune the loop [only] for 1:1 SWR. Using the "get it close and let the ATU match it" scheme will lead to a round, fairly pricey dummy load. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 5/14/2020 7:19 PM, Phil Kane wrote: On 5/13/2020 12:42 PM, brianchapn...@rogers.com wrote: Im thinking of a loop. I've had good luck with them. Any thoughts? I've been using a loop on the porch of our ground level apartment. At 15 watts. It is useless - can't get it to tune properly and I often think that I would have a better signal with my dummy load at 100 watts. If you are getting good luck you must be doing something right. At east you have the advantage of 34 stories - good for you. 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Fwd: Establishing A New Station
I've been playing with a MFJ loop for my second floor condo and I can say that loops are extremely sensitive to any close objects/surfaces. For instance, tuning changed significantly when I had mine laying on the roof vs. ~4ft above it (to the point where SWR was marginal on the lower part of 40m with the former). It was horizontal both times, too. Also, loops are going to have more loss at the lower end of their design range due to physics. 15w may very well not be enough to make contacts depending on how it's designed, though band conditions also play a role. -Mooneer K6AQ On Thu, May 14, 2020 at 7:21 PM Phil Kane wrote: > > On 5/13/2020 12:42 PM, brianchapn...@rogers.com wrote: > > > Im thinking of a loop. I've had good luck with them. Any thoughts? > > I've been using a loop on the porch of our ground level apartment. At > 15 watts. It is useless - can't get it to tune properly and I often > think that I would have a better signal with my dummy load at 100 watts. > If you are getting good luck you must be doing something right. At > east you have the advantage of 34 stories - good for you. > > 73 de K2ASP - Phil Kane > Elecraft K2/100 s/n 5402 > > From a Clearing in the Silicon Forest > Beaverton (Washington County) Oregon > __ > 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 > Message delivered to moon...@gmail.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 Message delivered to arch...@mail-archive.com
[Elecraft] Fwd: Establishing A New Station
On 5/13/2020 12:42 PM, brianchapn...@rogers.com wrote: > Im thinking of a loop. I've had good luck with them. Any thoughts? I've been using a loop on the porch of our ground level apartment. At 15 watts. It is useless - can't get it to tune properly and I often think that I would have a better signal with my dummy load at 100 watts. If you are getting good luck you must be doing something right. At east you have the advantage of 34 stories - good for you. 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 >From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon __ 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 Message delivered to arch...@mail-archive.com
