Hello Paul,
I measured the signal strength of HE3OM relative to DCF39 as -41dB.
I am pretty confident about this value as I used a calibrated attenuator (1dB steps). Calibration of the attenuator was done with a R&S SMG signal generator (should be .01dB accurate) and a R&S URV3
(I didn't win the lottery, just have these available at QRL).
So, IF DCF39 runs 40kW EIRP (maybe measured by pro's ?) and IF the path loss of DCF39 and HE3OM is identical (as the distance is almost identical) then one could conclude that HE3OM runs 4W EIRP.
But all this was not my point, I just wanted to be helpfull and give the US stations some clue of the signal they can expect from HE3OM.
73, Rik ON7YD - OR7T
Mal,
You will just have to wait then.... I certainly have both the equipment and the antennas (both calibrated) needed to measure field strength available to me but you have already
said that my measurements would be meaningless and disparaged both my ability and qualifications - as well as those of others. So NO I will certainly not bother with your transmissions or, indeed, pursue this subject further as my expectation of your response
has been borne out.
Paul G8GJA
Radio amateurs do not have suitable calibrated equipment, suitable antennas nor in most cases the expertise to carry out these measurements.
Can you measure my ERP ? and if so what is it ?
From your statement I assume you are an expert and qualified to make these measurements.
I am frequently on 137.7 and 136.318 I now await your observations.
G3KEV
----- Original Message -----
Sent: Wednesday, February 16, 2011 3:24 PM
Subject: RE: LF: TA TONITE
Mal,
The reference ...'especially by Radio Amateurs' could well be considered offensive and is definitely not borne out by fact. I suppose that the only qualified people would be
marine radio officers?
I will not request a retraction - knowing you it would not be forthcoming - but could you be a bit careful with sweeping generalisations in the future?
Paul G8GJA
Toni
It is all Guesswork trying to measure ERP some hundreds of miles away. especially by Radio Amateurs.
I have seen figures in the past and after a detailed mathematical analysis the concluded statement was that this could be 6 dB either way, in other words the erp measured could be 1W erp or maybe 4w erp or even worse a lot less.
Let them believe what they like hi
g3kev
----- Original Message -----
Sent: Wednesday, February 16, 2011 1:08 PM
Subject: Re: LF: TA TONITE
Thanks Rik
I've read somewhere that DCF39 has 40kW EIRP. So we would have around 4W EIRP. Last week a station measured our field strength, 100km away and came to 0.4WEIRP. This is probably a little bit to low. Anyway, it shows me again, that most amateurs overestimate
their ERP. Even Mal has probably not the Watt he claims ;-)
73 de Toni
2011/2/16 Rik Strobbe <[email protected]>
Hello Toni, group,
I measured the HE3OM signal 41dB down on DCF39.
Distances to HE3OM (504km) and DCF39 (515km) are almost identical.
This might give the US stations a clue what signal strength they can expect from HE3OM and what QRSS speed Tony could use to be copied.
73, Rik ON7YD
Dear Jim, Mal and LF Group
Unfortunately the tower is not nearby my house and I can't leave the station running unattended. And the nights I can spend in Sottens are limited by my health and my wife, hi. So there is no trial before, I have just next Friday night.
If I take a look at the reports we got in the past two weeks from stations 2000-3000km away (always good audible), it should be possible to span 6000km using QRSS10.
On the receiving side, we may be able to see stations let's say with QRSS60. This would mean, that we could make only one or two QSO's. May be it's better to try Crossband: we transmit in QRSS10 and listen on 80m. This would give more stations the opportunity
to contact us. However, if there is a station from the East Coast we copy in QRSS10 it would get the priority.
What do you think about this approach?
73 de Toni
2011/2/15 James Moritz <[email protected]>
Dear Toni, LF Group,
HE3OM has the advantage of a much stronger TX signal than most Eu stations, so I guess you have a good chance of being copied in NA on Friday night, unless the propagation is very poor. But as you will have seen from the activity last weekend, forward planning
is always a good thing, especially where a single QSO takes hours. If possible, I would suggest transmitting some beacon signals from HE3OM between now and Friday, so that North American stations can get a good idea what QRSS speed can be copied from your
station. Also, try to receive any W/VE beacons that might be running, so that you also know what the requirement will be in the other direction. Finally, I have usually found reception of US stations is best just before dawn here, so make sure you are not
going to be busy on Saturday!
Good luck,
Cheers, Jim Moritz
73 de M0BMU
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