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41. Re: Topband: FT8 - How it really works (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sat, 22 Dec 2018 12:31:52 -0600
Still doing FT8 testing this morning 3 hours after sunrise I looked for something resembling dead band conditions with only a few weak stations. There was nothing on 160 but the west coast guys were
/archives//html/Topband/2018-12/msg00229.html (13,806 bytes)

42. Re: Topband: FT8 - How it really works (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Mon, 24 Dec 2018 14:10:09 -0600
Although I have finished my FT8 testing, there is one final thought I would like to leave with you, and also to correct one statement I made earlier. Someone thought FT8 measured the noise in the int
/archives//html/Topband/2018-12/msg00253.html (13,085 bytes)

43. Topband: V84SAA prop to AL (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Mon, 11 Feb 2019 10:27:45 -0600
Better propagation from V84SAA this morning into Alabama. I have been listening for him at every opportunity and not a peep from him on 160 until this morning. He was good copy at times. Called for 3
/archives//html/Topband/2019-02/msg00111.html (6,734 bytes)

44. Re: Topband: RFI on TB (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Tue, 23 Jul 2019 10:43:56 -0500
Don't know why the mail system thinks this message is spam... Trying again. Lightning surge suppressor on power poles can be big noise generators when they go bad. The worst one I found was three mil
/archives//html/Topband/2019-07/msg00069.html (8,399 bytes)

45. Re: Topband: FCP vs Gull Wing Elevated Radials (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Fri, 26 Jul 2019 21:33:56 -0500
When I did those tests at my house the velocity factor of a dipole on the ground was usually about 65% but many times there was no resonance at all, so no way to calculate velocity factor. Total impe
/archives//html/Topband/2019-07/msg00103.html (8,920 bytes)

46. Re: Topband: DOG (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sat, 27 Jul 2019 14:02:46 -0500
K2AV said: "DOG conductor in contact with ground moisture near the ends could completely skewer results. That's an electrical 1/4 wave between center and either end of the DOG. Inadvertently groundin
/archives//html/Topband/2019-07/msg00108.html (10,783 bytes)

47. Topband: FT-8 performance (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Thu, 1 Aug 2019 08:17:12 -0500
I get the feeling that I must be the only person that has ever tested FT-8 to the extreme to see what it can do. It seems that everyone else just assumes it will do what the published information say
/archives//html/Topband/2019-08/msg00009.html (10,983 bytes)

48. Re: Topband: BOG height (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Thu, 1 Aug 2019 13:28:24 -0500
On 8/1/2019 12:36 PM, Mark K3MSB wrote: Ive used BOGs and RBOGs at 200 feet length laying on the ground. The BOG worked great, the RBOG worked good, but not as good as the BOG. I agree with K3MSB's c
/archives//html/Topband/2019-08/msg00033.html (10,205 bytes)

49. Re: Topband: FT-8 performance (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Thu, 1 Aug 2019 14:03:40 -0500
W0BTU directed a question to me about JT-9. I have never tested JT-9 so I don't have any information to supply on that subject. The S/N number supplied by FT-8 was only a curiosity to me because I co
/archives//html/Topband/2019-08/msg00045.html (8,568 bytes)

50. Re: Topband: FT-8 performance (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Thu, 1 Aug 2019 16:09:55 -0500
I'm not sure how FT-8 calculates the reported S/N number. I found very little information on the subject and what I did find was not easily understandable. What I did was an experiment in which I was
/archives//html/Topband/2019-08/msg00055.html (9,521 bytes)

51. Re: Topband: BOG. (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Thu, 1 Aug 2019 17:09:36 -0500
You may be surprised at what a 600 ft BOG will do. I did some measurements comparing a 366 ft BOG to a 250 ft one. The patterns were different but the signal to noise ratios and front to back were cl
/archives//html/Topband/2019-08/msg00060.html (8,401 bytes)

52. Topband: FT8 on 160 - how you can make a difference (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sat, 3 Aug 2019 14:28:16 -0500
There is growing trend on 160 that I find disturbing and that is for major DXpedition to use FT8 for all or mostly all 160 operations. They do that because they "know" that FT8 is ideally suited for
/archives//html/Topband/2019-08/msg00140.html (10,768 bytes)

53. Re: Topband: FT8 on 160 - how you can make a difference (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sat, 3 Aug 2019 19:51:08 -0500
NR2DX asked: "If read your post correctly you are saying that you are working against an ambient noise level of 20-30 db over S9 is that correct.? " No. The S9+20 to 30 dB is the S meter reading when
/archives//html/Topband/2019-08/msg00151.html (9,137 bytes)

54. Re: Topband: BOG height (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sat, 3 Aug 2019 20:44:11 -0500
K2AV seem to be a storehouse of information. Thanks again Guy. That never happened with my 366 ft BOG when it was lying on dead grass at an average of about 1.5 inches above the dirt. My tests compar
/archives//html/Topband/2019-08/msg00152.html (10,760 bytes)

55. Re: Topband: BOG height (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sun, 4 Aug 2019 08:35:06 -0500
I think BOG is a perfect name. It honors the inventor Harold Beverage. We have lots of things in ham radio that are misnamed but BOG isn't one of them. An interesting read is this interview with Haro
/archives//html/Topband/2019-08/msg00155.html (8,263 bytes)

56. Re: Topband: FT-8 performance (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sun, 4 Aug 2019 17:38:35 -0500
Thanks Paul. I had read one of those articles before. I didn't find the more detailed one earlier when I was looking. He is relating the S/N reported by the digital modes to what it really should be.
/archives//html/Topband/2019-08/msg00166.html (11,697 bytes)

57. Re: Topband: An oddball question about a BOG. (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Sun, 25 Aug 2019 14:47:44 -0500
The comments in your first paragraph are very confusing, mixing up information on different antennas, old or proposed, and parts data, without clearly distinguishing what each comment refers to. I do
/archives//html/Topband/2019-08/msg00272.html (14,477 bytes)

58. Re: Topband: Topband Digest, Vol 200, Issue 28 (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Mon, 26 Aug 2019 13:06:54 -0500
You said you had 10 of these on your BOG. 10 X 23.8 = 238 ohms. The table of inductance values for each frequency that you quoted in your last message is what NEC gave for the best pattern at each fr
/archives//html/Topband/2019-08/msg00279.html (8,020 bytes)

59. Re: Topband: 160 skip distance (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Tue, 17 Sep 2019 08:14:49 -0500
A few years back guys on this forum decided to see what could be worked at noon time. There were a few stations on at that time and I worked stations up to 600 miles. That will vary with band conditi
/archives//html/Topband/2019-09/msg00077.html (6,989 bytes)

60. Re: Topband: Coax for Top-band beverage antenna (score: 1)
Author: K4SAV <RadioXX@charter.net>
Date: Thu, 19 Sep 2019 11:57:58 -0500
Don't worry about feedline loss for a Beverage. A few dB loss isn't going to make any difference at all. You can worry about feedline loss for transmit antennas, not for receiving antennas. Jerry, K4
/archives//html/Topband/2019-09/msg00091.html (8,416 bytes)

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