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Re: W8TEE Mag Loop Testing
Al just ran 100W through it for 2 minutes and "shot" the temperature...no heating or arcing. Jack, W8TEE
On Thursday, May 30, 2019, 2:54:10 PM EDT, Gwen Patton <ardrhi@...> wrote:
I have a similar loop on my mantlepiece right now. It's not made of rigid copper, and isn't a multi-turn loop. It's about a 3.5 foot loop of plastic pipe strap, with 1/2" wide conductive-adhesive copper foil tape on one side. The coupling loop is made of the same material, with the copper on the inside surface. It works pretty well for 40-30-20m, and handles up to 100w no problem. I got an FT8 contact with Fargo on 40m running about 40W on it, inside the house. Gwen, NG3P On Thu, May 30, 2019 at 2:50 PM Kees T <windy10605@...> wrote:
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Preliminary results -- W8TEE/AC8GY Mag Loop Testing
All: Conditions were not ideal, but we did get some RBN reports. While it's far too soon to say much, it appears the mag loop gives up about 1-2dB over the EFHW, which is up about 60' or so. VE8JY in Alberta heard us, but looking at their antenna system, they can probably still hear Jimmy Hoffa's last conversation. Also, we did get some rain during the test period which forced us to stop for a while. We tried to protect the cap, but were not totally successful. We are going to try again after we iron out some hiccups that showed up during the test. We also need to put it in a protective case. About the design. The feed loop is rotatable (by hand right now), but we do not think it's worth the effort to motorize it. The software driving the cap via a stepper motor works pretty well, but we think we can refine it somewhat. We are about 50' away from the ML and the control aspects seem to work just fine. Why the 4-loop construction? Because we wanted to be able to fit the loop in the truck of a car without killing the efficiency. True, it's not an Alex loop, but we didn't intend it to be. On the other hand, it's going to be cheaper than most portable antennas and it can handle considerably more power than most. We have more tests in mind down the road, but we are encouraged by the results. To all of you who tried to give us a listen today, Al and I very much appreciate your efforts on our behalf. Jack, W8TEE
On Thursday, May 30, 2019, 1:18:40 PM EDT, Jack Purdum <jjpurdum@...> wrote:
All: Today we began testing Al's new mag loop (ML) design, shown here: It's a 40-30-20M "luggable" loop. It's about 3' in diameter, breaks down so it fits in a car, and we can get almost 1.1:1.0 on all three bands with our remote controller. (Peter Parker might use it on the beach down under, but most of us won't use it as a walkable antenna.) We ran some tests today and did see RBN reports so we know it radiates. However, it's not waterproof yet and the rains moved in...again. We plan on testing later today starting at 3PM EST on 7.050MHz. We will be transmitting on two antennas: 1) the ML and 2) an EFHW in an attempt to get some meaningful comparisons. We expect to run about 20W of power. We will alternate between the two, but you won't know which is which. After about 45 minutes and it the weather holds, we will move up to 14.080MHz to repeat the tests. If you have time around then, use the RBN to report what you're hearing. We'd really appreciate it! Jack, W8TEE Al, AC8GY |
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Re: W8TEE Mag Loop Testing
Gwen Patton
I have a similar loop on my mantlepiece right now. It's not made of rigid copper, and isn't a multi-turn loop. It's about a 3.5 foot loop of plastic pipe strap, with 1/2" wide conductive-adhesive copper foil tape on one side. The coupling loop is made of the same material, with the copper on the inside surface. It works pretty well for 40-30-20m, and handles up to 100w no problem. I got an FT8 contact with Fargo on 40m running about 40W on it, inside the house. Gwen, NG3P On Thu, May 30, 2019 at 2:50 PM Kees T <windy10605@...> wrote:
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W8TEE Mag Loop Testing
All: Today we began testing Al's new mag loop (ML) design, shown here: It's a 40-30-20M "luggable" loop. It's about 3' in diameter, breaks down so it fits in a car, and we can get almost 1.1:1.0 on all three bands with our remote controller. (Peter Parker might use it on the beach down under, but most of us won't use it as a walkable antenna.) We ran some tests today and did see RBN reports so we know it radiates. However, it's not waterproof yet and the rains moved in...again. We plan on testing later today starting at 3PM EST on 7.050MHz. We will be transmitting on two antennas: 1) the ML and 2) an EFHW in an attempt to get some meaningful comparisons. We expect to run about 20W of power. We will alternate between the two, but you won't know which is which. After about 45 minutes and it the weather holds, we will move up to 14.080MHz to repeat the tests. If you have time around then, use the RBN to report what you're hearing. We'd really appreciate it! Jack, W8TEE Al, AC8GY |
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Re: Storm Damage
Al (AC8GY) has a drone with a claw drop on it and it was pretty easy to put the EFHW up...he literally dropped the weight through a 3' circle from 100'! Right now, the forecast is pretty much rain for the next few days, but when that clears, it will go back up. Jack, W8TEE
On Thursday, May 30, 2019, 8:47:03 AM EDT, Glenn <glennp@...> wrote:
Having been to Hara Arena five times in the early 2000's it was quite a shock to see the damage there. Hope you can get the antenna up again Jack, asap. glenn vk3pe |
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Re: Storm Damage
I kinda miss the old arena, but I doubt that it will ever be rebuilt. Jack, W8TEE
On Thursday, May 30, 2019, 8:47:03 AM EDT, Glenn <glennp@...> wrote:
Having been to Hara Arena a number of times in the early 2000's I was amazed to see the damage tornadoes can bring. I never knew Dayton was in the 'danger' area.? WE don't get many Tornadoes in VK, those we do mostly limited to the very north. I had heard though that Hara was to be redeveloped? Prior to this. Glenn vk3pe |
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Storm Damage
All: Well, once again I got nailed by the storm that hit Dayton (I'm about 50 miles south). This is the third time in as many years that I've lost my antenna. The culprit: a limb from a big old mulberry tree. It will be easy to repair, just need to find the time to do it. Oddly, the antenna wasn't even in the mulberry tree, but it snagged just enough to bring the antenna down. Oh well...just part of being a ham. Jack, W8TEE |
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Re: JackAl User Manual BOM page 26
That was corrected a while back, but our web site is down because it was hacked. Al's going to tear it down and start from scratch this week. Our ISP has been virtually no help at all. Jack, W8TEE
On Monday, May 20, 2019, 2:13:32 AM EDT, paul wegwert <chico.wegwert@...> wrote:
Jack, FYI, In the BOM at the end of the manual, the 5v 1.5A voltage regulator is labeled LM7812CT/NOPB-ND (Digikey) the number is for a 12v 1A regulator. The actual part is LM7805CV TO-220 which is a 5V regulator at 1.5A. Also the 3.3v regulator identified in the BOM is a 1.5 A vice a 1.3A and Arrow now has it for $1.77 each. V/R Paul KD9JYV |
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Morse Tutor BOM Error number
Doug pointed out that I have the wrong encoder number in the BOM for the Morse Code Tutor presented at FDIM. You definitely want the switch and the PEC11R-4020K-S0024 should do fine. Jack, W8TEE
On Sunday, May 19, 2019, 4:38:12 PM EDT, Doug W <dougwilner@...> wrote:
Jack, I'm going through the schematic for your morse code tutor and I think you might have the wrong encoder number in your BOM.? You call out PEC11R-4020F-N0024.? The N indicates no switch.? Did you mean to list PEC11R-4020F-S0024 which has the momentary switch?? If that is the case, it is worth noting that Arrow.com does not stock the S version but they do have PEC11R-4020K-S0024 which is the same encoder with a knurled shaft. Doug AC9RZ |
jjpurdum
digger AB3XU