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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*Antenna\s+resistance\s+\(Re\:\s+LF\:\s+EbNaut\s+Autodecoder\s+137490\s+Hz\:\s+EA5DOM\s+received\)\s*$/: 13 ]

Total 13 documents matching your query.

1. Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: N1BUG <[email protected]>
Date: Sat, 27 Oct 2018 06:34:57 -0400
Hi Luis, Markus, LF This is a very interesting topic for me too. My antenna resistance is very high, usually more than 100 ohms. I think there may be a few reasons. There are trees near the antenna w
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00200.html (15,886 bytes)

2. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: "[email protected]" <[email protected]>
Date: Sat, 27 Oct 2018 07:42:24 -0400
Paul It's been my 'hypothesis' that as the temperature cools the sap heads toward the roots in stages ... not in one big rush. As the temperature heads toward freezing, sap first leaves the small bra
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00206.html (15,326 bytes)

3. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: Laurence KL7 L <[email protected]>
Date: Sat, 27 Oct 2018 14:58:36 +0000
I would absolutely agree with Jay - and your comments Paul - proportional and differential - the trees react very fast to external temps and clearly seen on losses - The White Birch especially, my Co
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00207.html (17,735 bytes)

4. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: VIGILANT Luis Fernández <[email protected]>
Date: Sat, 27 Oct 2018 21:11:54 +0000
Hi All, LF Interesting topic. Also happens in MF but in LF it gets more critical. Must be a nightmare at VLF :( As Marco explained, our setup is not the usual at ground level in a property plot. And
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00210.html (17,360 bytes)

5. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: Markus Vester <[email protected]>
Date: Sat, 27 Oct 2018 22:21:21 +0000 (UTC)
Hi All, LF Interesting topic. Also happens in MF but in LF it gets more critical. Must be a nightmare at VLF :( As Marco explained, our setup is not the usual at ground level in a property plot. And
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00211.html (19,294 bytes)

6. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: VIGILANT Luis Fernández <[email protected]>
Date: Sun, 28 Oct 2018 13:15:36 +0000
Hi Markus, LF The pipe contains presurized water for the fire extinguish system. Is a "wet colum" system. Pipe segments are connected with big brass links. Should be a good enought current conductor.
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00212.html (22,038 bytes)

7. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: DK7FC <[email protected]>
Date: Sun, 28 Oct 2018 16:26:02 +0100
Hi Luis, Am 27.10.2018 23:11, schrieb VIGILANT Luis Fern&aacute;ndez: Hi All, LF Interesting topic. Also happens in MF but in LF it gets more critical. Must be a nightmare at VLF :( Here it is more c
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00214.html (18,391 bytes)

8. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: N1BUG <[email protected]>
Date: Sun, 28 Oct 2018 16:22:11 -0400
Thanks Jay and Laurence for weighing in on this. Like many amateur radio operators I am not likely to have opportunity to take field strength measurements, though I wish I could. It seems to me it mu
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00221.html (22,383 bytes)

9. RE: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: VIGILANT Luis Fernández <[email protected]>
Date: Mon, 29 Oct 2018 17:34:41 +0000
Hi Stefan, LF I have an old thermocouple Amp meter, 4A range. Couldn&#8217;t check if calibration is correct but better than nothing Yes, the output waveform from PA is a perfect sine in the scope Hm
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00228.html (29,602 bytes)

10. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Mon, 29 Oct 2018 20:28:56 +0100
Luis you mention measuring at the end of 30m of coax. Presumably the loading coil is at the antenna?? In which case you need to check that you have not parasitic resonances at harmonics of the drive
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00229.html (31,725 bytes)

11. RE: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: VIGILANT Luis Fernández <[email protected]>
Date: Tue, 30 Oct 2018 09:53:36 +0000
Hi Alan, LF Thank you for your comments Yes, the coil is at the antenna, at the end of the 30m coax line. Attached is a sweep between 8 and 300Khz There is only one resonance at 137KHz as you can see
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00232.html (37,562 bytes)

12. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: "Alan Melia" <[email protected]>
Date: Tue, 30 Oct 2018 11:30:48 +0100
Ok Luis I remembered after I posted, that I think Andy's loading coil was indoors fed by short coax run to the wire. So the capacitance of the coax was across the link, or tapped section. Pure water
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00233.html (39,725 bytes)

13. Re: Antenna resistance (Re: LF: EbNaut Autodecoder 137490 Hz: EA5DOM received) (score: 1)
Author: Andy Talbot <[email protected]>
Date: Tue, 30 Oct 2018 10:36:15 +0000
Ok Luis I remembered after I posted, that I think Andy's loading coil was indoors fed by short coax run to the wire. So the capacitance of the coax was across the link, or tapped section. Pure water
/rsgb_lf_group-archives/html/rsgb_lf_group/2018-10/msg00234.html (41,468 bytes)


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