To: | <[email protected]> |
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Subject: | LF: Re: Re: Antenna Diversity |
From: | "mal hamilton" <[email protected]> |
Date: | Tue, 13 Jan 2009 19:58:36 -0000 |
References: | <003301c9759e$c21f3f00$0301a8c0@mal769a60aa920> <7665659012654DCE89B4DD1FC8228550@JimPC> |
Reply-to: | [email protected] |
Sender: | [email protected] |
Yes JimI have all of this in mind, but I am not too concerned about the detail at present, just trying to observe the sig quality for qso purposes. I would like to try it some time on the TR path. The best method of course is one RX and both antennas fed to it via a mixer and each antenna input calibrated and equalised. Ideally each antenna should have a separation of 1 wavelength at least, but that is difficult considering the freq and space reqd. I have seen this done on HF and it is vy impressive. There are other ways if one had the time. 73 and tnx ur observations de mal/g3kev----- Original Message ----- From: "James Moritz" <[email protected]> To: <[email protected]> Sent: Tuesday, January 13, 2009 6:37 PM Subject: LF: Re: Antenna Diversity Dear Mal, LF Group,That is an interesting experiment - It would be interesting to know how farapart the loops are to result in different fading patterns.I would be very wary in interpreting the results from two totally differenttypes of receiver - The SLM has essentially a fixed gain, while I see the IC-746 has a DSP "back end" with complex AGC loops acting on both analogueand digital parts. I guess the AGC in the IC746 is never totally disabled inorder to prevent overloading of the A/D converter. So that may explain why loop "B" has a more constant apparent output level. One check would be toswap over the antennas between receivers, and see what difference that made. I suppose it would not be too difficult to have, say, a relay that switchedthe same RX input between the two antennas, perhaps every 10 or 20s or so, with an attenuator pad to get the signal levels roughly equal. That way , the comparison could be made with a single receiver. Cheers, Jim Moritz 73 de M0BMU----- Original Message ----- From: "mal hamilton" <[email protected]>To: "rsgb" <[email protected]> Sent: Tuesday, January 13, 2009 4:48 PM Subject: LF: Antenna Diversity LF/MF I am experimenting at present with antenna (space diversity) using two loops... -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - http://www.avg.comVersion: 8.0.176 / Virus Database: 270.10.6/1889 - Release Date: 1/12/2009 8:18 PM |
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