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41. Re: Topband: Top Loading Advice (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Sun, 17 Mar 2019 18:48:45 -0500
Bob, You should lengthen the two top loading wires so that the basic resonance of the vertical is about 1.9mhz. Then add a Hairpin coil across the feed point and adjust it/ top loading to place the m
/archives//html/Topband/2019-03/msg00061.html (9,158 bytes)

42. Re: Topband: Top Loading Advice (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Sun, 17 Mar 2019 18:55:39 -0500
Bob, I should have added that you would increase the performance of the antenna if you could find a way to raise the ends of the top loading by the same amount on each side, this will raise the feed
/archives//html/Topband/2019-03/msg00062.html (8,678 bytes)

43. Re: Topband: Modern Grand Solar Minimum from 2020 to 2055? (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Tue, 25 Jun 2019 16:20:49 -0500
Well Frank if they are wrong we can for sure never to call them experts again. I also see NOAA does not agree with the Australians who think the minimum has already gone through. Again only one winne
/archives//html/Topband/2019-06/msg00027.html (8,542 bytes)

44. Re: Topband: Hairpin match to inverted L? (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Sun, 01 Sep 2019 15:46:48 -0500
Simple, resonate the vertical at about 1.9mhz. Then add the inductance across the feed point which may well be in the 2-3 micro Henry region. But use a variable L and slightly alter the L or top load
/archives//html/Topband/2019-09/msg00008.html (8,417 bytes)

45. Topband: Inverted L redux (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Mon, 02 Sep 2019 15:40:14 -0500
The bandwidth of the SWR is a clue to how poor the ground system is. As you add radials the bandwidth will get narrower and the SWR is likely to change. At present it all looks like a big dummy load.
/archives//html/Topband/2019-09/msg00026.html (9,120 bytes)

46. Re: Topband: inverted-L (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Wed, 04 Sep 2019 09:17:17 -0500
Pete the simplest method is to shorten the resonance of the antenna before adding the shunt to around 1.9mhz. Then use a variable L to find the correct value. Measure its inductance and replace it wi
/archives//html/Topband/2019-09/msg00036.html (7,462 bytes)

47. Re: Topband: [TowerTalk] Skip Distance (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Fri, 13 Sep 2019 11:41:55 -0500
Try it at midday. 73 Clive GM3POI These test were in late morning to early afternoon. 73, Roger miles contamination _________________ Searchable Archives: http://www.contesting.com/_topband - Topband
/archives//html/Topband/2019-09/msg00059.html (8,387 bytes)

48. Re: Topband: CQ WW Contest (score: 1)
Author: "Clive GM3POI" <clive@gm3poi.com>
Date: Wed, 29 Jan 2020 05:38:28 -0500
Guy you only have to look at the past results for CQ160 to know that this year's conditions were not anywhere near as good as 2009. Then I worked around 700 US stations including all States and 57 St
/archives//html/Topband/2020-01/msg00355.html (10,024 bytes)

49. Topband: Phasing lines (score: 1)
Author: <clive@gm3poi.com>
Date: Tue, 03 Mar 2020 10:30:46 -0500
Hi all, I wonder whether anyone has used LDF4-50A for phasing lines and verified the VF as being 88%. If not have you an idea of any spread on the VF. I want to use some where it could make the diffe
/archives//html/Topband/2020-03/msg00035.html (7,008 bytes)

50. Re: Topband: Phasing lines (score: 1)
Author: <clive@gm3poi.com>
Date: Tue, 03 Mar 2020 11:04:59 -0500
Thanks Peter and Dave that's good to know. I'll be using a VNA anyway. I am not surprised the VF does not vary that much because of the construction type. 73 Clive GM3POI Hi Clive, i have used chunks
/archives//html/Topband/2020-03/msg00038.html (9,892 bytes)

51. Re: Topband: Phasing lines (score: 1)
Author: <clive@gm3poi.com>
Date: Tue, 03 Mar 2020 17:09:10 -0500
Thanks Frank as I thought great to get the confirmation. 73 Clive GM3POI My experience with LDF4-50 and LDF4-75 is exact;y the same as Peter's. Its always best to use an antenna analyzer or TDR to cu
/archives//html/Topband/2020-03/msg00046.html (9,520 bytes)

52. Re: Topband: CQWW a bust this year (score: 1)
Author: <clive@gm3poi.com>
Date: Tue, 01 Dec 2020 08:32:33 -0500
Not so bad here, but I only worked 140 US and managed a few West coast Z3. Really quite poor. 1202Q 19Z, 70 DXCC in 20 hours operation 73 Clive GM3POI/ GM3X Compare to recent weeks conditions were ma
/archives//html/Topband/2020-12/msg00003.html (8,919 bytes)

53. Re: Topband: Looking for user experience: DXEngineering Thunderbolt 160m vertical (score: 1)
Author: <clive@gm3poi.com>
Date: Sat, 05 Dec 2020 09:03:29 -0500
Dave that seems expensive and not cost effective. I would use two scaffold 20' poles plus a lighter gauge top section of similar dia. You can buy aircraft grade DIN tubing 6082 which is slightly bett
/archives//html/Topband/2020-12/msg00060.html (9,205 bytes)

54. Re: Topband: Low Dipoles (score: 1)
Author: <clive@gm3poi.com>
Date: Sat, 12 Dec 2020 05:22:18 -0500
Same here Frank, I have tried low dipoles (90FT) and never did one of those antennas measure up to my vertical system. I put mine all down to the ground system, which is far greater than mr average w
/archives//html/Topband/2020-12/msg00143.html (12,372 bytes)

55. Re: Topband: Low Dipoles (score: 1)
Author: <clive@gm3poi.com>
Date: Fri, 18 Dec 2020 10:10:28 -0500
Mike, all antennas work, some better than others, a choice of one maybe not ideal. Without an A/B comparison impossible to judge and I would add if any vertical system is less than a quarter wave hig
/archives//html/Topband/2020-12/msg00182.html (8,218 bytes)

56. Re: Topband: Elevated Radials - will radials on ground help? (score: 1)
Author: <clive@gm3poi.com>
Date: Tue, 29 Dec 2020 12:25:39 -0500
Frank what about adding another radial to each vertical to cancel the Horizontal polarisation from the single radial. 73 Clive GM3POI Hi Dan, Your small lot is an ideal candidate for K2AV's folded co
/archives//html/Topband/2020-12/msg00255.html (12,395 bytes)

57. Re: Topband: Cage wire performance (score: 1)
Author: <clive@gm3poi.com>
Date: Mon, 04 Jan 2021 10:12:44 -0500
Kenny a lot will depend on your ground system. If it is very good then that extra bandwidth may help. But if it is just medium quality, there will be sufficient loss not to bother until and if you im
/archives//html/Topband/2021-01/msg00069.html (8,480 bytes)

58. Topband: FW: The USA-CA Awards (score: 1)
Author: Clive GM3POI <clive@gm3poi.com>
Date: Mon, 6 Feb 2023 12:46:36 +0000
Hi Nick, Well I have never checked from here, but I have worked WAS twice during a single weekend and have over 8600 Qs with the USA on 160. That is without trying to make a habit of working USA on a
/archives//html/Topband/2023-02/msg00005.html (7,628 bytes)

59. Re: Topband: KH8 Demand on TB (score: 1)
Author: Clive GM3POI <clive@gm3poi.com>
Date: Tue, 31 Oct 2023 13:32:22 +0000
Wes I would add that if you have worked it before and its confirmed, then give those that do not have it a chance. After all its a local for the West coast. 73 Clive GM3POI I worked W1AW/KH8  twice (
/archives//html/Topband/2023-10/msg00073.html (9,358 bytes)

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