Return to KLUBNL.PL main page

Search String: Display: Description: Sort:

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Re\:\s+Re\:\s+500kHz\s+Portable\s*$/: 9 ]

Total 9 documents matching your query.

1. LF: Re: Re: 500kHz Portable (score: 1)
Author: "mal hamilton" <[email protected]>
Date: Fri, 8 May 2009 15:56:49 +0100
Jim You do not need 2 masts for an inv L or T antenna. The so called horizontal wire(s) can slope down and the far end tied to a bush or tree, or a stake in the ground via an insulator, as far away a
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00056.html (13,504 bytes)

2. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: lawrence mayhead <[email protected]>
Date: Thu, 14 May 2009 09:57:41 +0100
Lawerence No one is disputing downward SLOPE reduces the effective height. We are discussing 500 Khz PORTABLE and the most convenient way to erect a suitable antenna with minimum effort and you agre
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00112.html (20,675 bytes)

3. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: "Graham" <[email protected]>
Date: Tue, 12 May 2009 17:18:23 +0100
Yes your right on that Mike, If you model a T and then change it to arrow shape , once the free ends are more than about 6 feet off the ground the radiation and feed values are all over the place ..y
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00118.html (12,777 bytes)

4. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: "mal hamilton" <[email protected]>
Date: Tue, 12 May 2009 18:28:26 +0100
Lawerence No one is disputing downward SLOPE reduces the effective height. We are discussing 500 Khz PORTABLE and the most convenient way to erect a suitable antenna with minimum effort and you agree
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00236.html (17,764 bytes)

5. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: "mal hamilton" <[email protected]>
Date: Tue, 12 May 2009 14:52:25 +0100
-- Original Message -- From: [email protected] Andy Talbot To: [email protected] [email protected] Sent: Tuesday, May 12, 2009 2:16 PM Subject: Re: LF: Re: Re: 500kHz Po
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00244.html (16,456 bytes)

6. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: "Mike Dennison" <[email protected]>
Date: Tue, 12 May 2009 10:29:28 +0100
This is quite wrong. Any slope downwards will reduce the effective height of a Marconi. Since ERP is a function of the square of the effective height this is extremely important. An umbrella is far
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00263.html (10,792 bytes)

7. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: lawrence mayhead <[email protected]>
Date: Tue, 12 May 2009 17:02:45 +0100
  A small amount of slope on a large capacity hat might not be too noticeable in practice, as a lot of extra capacitance at the top could do more good than its slope undoes.   Please stop and actuall
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00309.html (16,788 bytes)

8. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: "mal hamilton" <[email protected]>
Date: Tue, 12 May 2009 13:09:37 +0100
You are certainly NO EXPERT at amateur radio never mind LF/MF and especially antennas. I have worked the world on LF/MF using Inv L antennas with the far end just above ground , and in normal CW mode
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00499.html (12,435 bytes)

9. Re: LF: Re: Re: 500kHz Portable (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 12 May 2009 14:16:38 +0100
A full quarter wave inverted L with sloping end is starting to become a loop with the ground path forming part of the loop conductor, rather than a vertical.   ANY antenna that approaches more than a
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-05/msg00506.html (15,469 bytes)


This search system is powered by Namazu