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Total 59 documents matching your query.

1. LF: Re: Re: LF - early April 1st question (score: 1)
Author: "Prof R. Jennison" <>
Date: Sun, 21 Mar 1999 18:06:04 -0500
It is not essential to produce Both the E and H fields. Either one can produce the other. For example the toroidal antenna launches only an E field with an associated vector potential that produce, i
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-03/msg00132.html (8,335 bytes)

2. LF: re: Weekend Reports 8/9 May (score: 1)
Author: "Prof R. Jennison" <>
Date: Mon, 10 May 1999 17:04:39 -0400
I was interested to see that all the weekend reports up to the time of writing this note concerned 136 kHz. I had hoped that there might have been some activity on 73 kHz. Rugby was off the air all w
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-05/msg00032.html (8,380 bytes)

3. LF: RX loops (score: 1)
Author: "Prof R. Jennison" <>
Date: Wed, 23 Jun 1999 17:00:57 -0400
Go for the biggest loop with the highest Q that you can get 73. Roger G2AJV
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-06/msg00131.html (7,561 bytes)

4. LF: Re: Antennas (score: 1)
Author: "Prof R. Jennison" <>
Date: Wed, 23 Jun 1999 17:23:54 -0400
The spacing between the wires on the horizontal top section is simply dictated by the fractional wavelength and the degree of efficiency required versus the mechanical and economical constraints of h
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-06/msg00132.html (8,099 bytes)

5. Re: LF: Ground systems (score: 1)
Author: "Prof R. Jennison" <>
Date: Mon, 26 Jul 1999 19:23:49 -0400
Just a minor comment on this much discussed topic. A few years ago, when experimenting with toroidal antennas on top band, I ran into the same problem. The local field from a toroid is entirely elect
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-07/msg00176.html (9,973 bytes)

6. LF: 73kHz sked (score: 1)
Author: "Prof R. Jennison" <>
Date: Mon, 9 Aug 1999 18:53:12 -0400
Mike, Welcome back to 73 kHz. I was about to resign from the LF net - it is saturating my little computer - but I received your message just in time. I have heard no fellow ham on the 73 band for age
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-08/msg00077.html (8,965 bytes)

7. LF: 73 kHz band, beacon test. (score: 1)
Author: "Prof R. Jennison" <>
Date: Fri, 3 Sep 1999 15:03:13 -0400
I shall be testing my beacon on 72.0 kHz (plus or minus about 100 Hz) between about 0700 Z and 0830 Z this Saturday and Sunday 4th and 5th September. I also hope to transmit for a longer period on Tu
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-09/msg00005.html (8,202 bytes)

8. Re: LF: 73 kHz band, beacon test. (score: 1)
Author: "Prof R. Jennison" <>
Date: Mon, 6 Sep 1999 16:04:39 -0400
I hope to transmit on the beacon from c 07.30am BST until at least c 09.30 BST on Tuesday. I can switch it on at a more convenient time by request if you will let me know your preference. The nominal
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-09/msg00016.html (8,290 bytes)

9. LF: 73 Beacon Test (score: 1)
Author: "Prof R. Jennison" <>
Date: Wed, 8 Sep 1999 18:47:08 -0400
Many thanks to all who listened for my 72kHz beacon on Tuesday. I was a silly old fool and switched on the beacon at 0732 BST but did not check it until after breakfast. At 0845 I discovered that the
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-09/msg00025.html (8,428 bytes)

10. LF: 73kHz (score: 1)
Author: "Prof R. Jennison" <>
Date: Tue, 5 Oct 1999 18:15:49 -0400
Mike and Peter, I did not hear either of you but I then put my own beacon on in the hope that I might be heard on normal cw. I will try again tomorrow but I have had no reception reports, and have he
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-10/msg00036.html (7,680 bytes)

11. LF: 73kHz - bad news (score: 1)
Author: "Prof R. Jennison" <>
Date: Wed, 6 Oct 1999 17:31:27 -0400
Mike et al, Thank you for the possible explanation of the 73 kHz blackout. I wonder if Rugby may have started to use spread spectrum in parallel with its normal system. Unfortunately I cannot be on t
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-10/msg00041.html (9,404 bytes)

12. LF: HF Convention - 73kHz (score: 1)
Author: "Prof R. Jennison" <>
Date: Mon, 11 Oct 1999 07:12:19 -0400
Sad to report, I heard no ham transmissions on Sunday, despite using my Tx loop (2 turns, each about 130 metres in circumference) as a receiving antenna beaming E-W. The commercial stations were boom
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-10/msg00083.html (9,262 bytes)

13. LF: DAYTONG converters. (score: 1)
Author: "Prof R. Jennison" <>
Date: Thu, 21 Oct 1999 15:37:03 -0400
About 2 weeks ago I mentioned an intense and troublesome carrier on about 36 kHz which produced a very strong second harmonic on the ham band at 72 kHz. From the strength of the second harmonic I ded
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-10/msg00157.html (8,655 bytes)

14. LF: re Datong converters (score: 1)
Author: "Prof R. Jennison" <boffi>
Date: Sun, 24 Oct 1999 08:48:58 -0400
Many thanks to Alan, G3NYK, and Bob, K3DJC, for their comments on the problem with Datong converters. In particular Alan's suggestion number 3 hit the nail on the head. Further checks with an oscillo
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-10/msg00167.html (9,042 bytes)

15. LF: (no subject) (score: 1)
Author: "Prof R. Jennison" <>
Date: Sun, 12 Dec 1999 16:49:04 -0500
Reference your comment: For low power applications you can use small plastic blocks, available at DIY stores. These are normally used for building cupboards and have a hole at each end and one at rig
/rsgb_lf_group-archives/html/rsgb_lf_group/1999-12/msg00045.html (8,494 bytes)

16. LF: 73kHz Today (score: 1)
Author: "Prof R. Jennison" <>
Date: Tue, 1 Feb 2000 18:08:17 -0500
Very many thanks to all who received my 73kHz signals today. I listened periodically between beacon transmissions but heard only two very weak signals. One was in very,very slow morse which made it d
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-02/msg00022.html (8,542 bytes)

17. LF: 73kHz mixer crystals ...who wants?? (score: 1)
Author: "Prof R. Jennison" <>
Date: Sat, 18 Mar 2000 13:17:25 -0500
Alan, Please, oh please, may I have a pair. I will, of course, refund all costs involved. 73 in haste, (Sorry not to contact you directly but my Compuserve refuses your address!) Roger, G2AJV. (Roger
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00170.html (7,938 bytes)

18. Re: LF: 73kHz - Rugby (score: 1)
Author: "Prof R. Jennison" <>
Date: Thu, 30 Mar 2000 16:26:09 -0500
Whatever has happened to the Rugby transmitter, it has been off the air for three days. Has it been sabotaged by overkeen Hams or have the authorities given up the fight against competing with Ham Ra
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00305.html (9,225 bytes)

19. Re: LF: 73kHz - Rugby (score: 1)
Author: "Prof R. Jennison" <>
Date: Fri, 31 Mar 2000 14:20:23 -0500
Geri, I am transmitting at the moment on 71.9 + or - 50Hz . I have to go QRT at 07.45 UT in deference to my 104 year old mother-in-law but should be able to switch on again at about 06.30 UT tomorrow
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-03/msg00316.html (8,339 bytes)

20. LF: The Haves and Have Nots. (score: 1)
Author: "Prof R. Jennison" <>
Date: Sat, 1 Apr 2000 17:42:49 -0500
The recent debate on very tall masts versus slow digital signal processing was quite amusing and yet slightly disturbing. The cost factors involved on both sides were never mentioned and the assumpti
/rsgb_lf_group-archives/html/rsgb_lf_group/2000-04/msg00001.html (8,897 bytes)


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