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Hi Paul,
I think Mal was quite rightly referring to test
equipment available to the professionals as opposed to 'us'
amateurs.
There was a discussion on here a year or so ago
where it was generally agreed that most of our 'estimates' at ERP had quite a
large degree of likely error!
Vy 73,
Chris, G4AYT.
----- 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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