WICEN Vic: WICEN 80m Net 29 June 2012

[Peter Weeks Radio]

Hi Everyone,

Thanks for the signal strength comparison chart John,  it certainly saved me looking it up.

The antenna is mounted mid roof of my workshop roof being 20m x 24m x 6m high and work much better with extended whip on 160, 80 & 40

Regards
Peter
VK3YZP

Sent from my Phone



> On 3 Jul 2021, at 19:44, John & Bronwyn <jandbmorrissey at gmail.com> wrote:
> 
> 
> Net opened at 20:30 hrs on 3600 kHz with VK3ZRX as Net Control. 
> 
> Checkins:
> 
> Mark VK3MDH  /P Cobram, 59, reports lots of Vicpol activity along the NSW / Vic border to do with Covid bans on people entering Vic from any NSW 'red spot'. 
> 
> Paul VK3FPDA, 57, reported poor sigs from everyone
> 
> Rik VK3EQ,  58, check in only, 
> 
> John VK3MS Milawa, 59, working on getting his shack set up & functional
> 
> Peter VK3YG Glenmaggie, 59, going interstate for a few days, also celebrating 57th wedding anniversary.  Congrats Peter and Jen!
> 
> Peter VK3YZP Alexandra, 58, using a Codan radio with tunable vertical (a Codan screwdriver with extended whip), reported my sig as +14dBuV (see below)
> 
> All greatly saddened to hear of the passing of long-term WICEN member Fred VK3JM.  Vale Fred. 
> 
> Coming events: 
> 
> Saturday August 7th 2021
> Gippsland Rally
> Heyfield area
> Contact: Ross Sargent VK3SF phone: 03 9736 4020
> Email: vk3sf at outereast.com.au
> 
> Sunday August 15th 2021
> Commanders & Co-Ordinators Meeting
> ZOOM (TBC )
> Contact: Ross Sargent VK3SF phone: 03 9736 4020
> Email: vk3sf at outereast.com.au
>  Net control next week:  Paul VK3DPW
> 
> Change of Net Control Roster:  With Fred's passing and another Net Control station not available for the foreseeable future (due to other commitments), I think it is time to revise the roster.
> 
> Anyone interested in being added to the net control roster, please contact me.   It is an interesting role and a valuable skill to have! 
> 
> 
> 
> And lastly, an explanation of Peter 3YZP's signal report.  The most common signal report is "S" units, with (on HF) S9 defined as 50 uV at the antenna terminals.  Then each lower "S" number is half the signal strength (-6dB) of the one just higher.  Another common specification is the actual signal strength in uV, most radios are specified in this way for sensitivity. Then there is dBm, which is the signal level in dB referred to a signal level of 1 mW into 50 ohms (this is about 0.224 volts). 
> 
> As well, some radios define signal levels in dB relative to 1uV, with abbreviation dBu.  
> 
>  For comparison, here are the various "signal strength" scales:  
> 
> 'S’ Units (HF)	uV	dBu	dBm
> 9	50	34	-73
> 8	25	28	-79
> 7	13	22	-85
> 6	6.3	16	-91
> 5	3.2	10	-97
> 4	1.6	4	-103
> 3	0.8	-2	-109
> 2	0.4	-8	-115
> 1	0.2	-14	-121
> And just to confuse things further, there are actually two "S unit" scales.  On HF, S9 = 50 uV.  But on V/UHF, S9 = 5 uV.  This makes S1 on V/UHF = -141 dBm - pretty much at the noise floor of a very good VHF/UHF receiver.  So it makes sense.  And there are two dBu scales - the one above which uses 1 uV, and another which uses 0.5 uV as the reference, which is used by some Japanese manufacturers. 
> 
> In practice the "S-unit" scales are nominal, not all manufacturers follow the "S-unit" standard and even then, radios often don't follow the scales accurately. 
> 
> So my report from Peter of +14dBu was about S6. 
> 
> Cheers,   John VK3ZRX
> 
> 
> 
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