Dear all,
After the message of Andreas that the 13cm part might be shifted to January 22/23 weekend, I did not see a final confirmation that this proposal is now the final decision.
Any further info?
Br. Jan, PAoPLY
Verstuurd vanaf: myMail voor iOS
Hello Lune-addicts
This weekend we will be available for some QSO via EME from the VE3MIS club
station located in FN03EQ on 144 and 432. I hope we will be able to work a
few of you during this contest time starting Saturday 1900UTC till Monday
0359UTC. I believe we also have enough to make a couple QSO on moonrise or
moonset on 222MHz.
If interested for a sked, please email ve3mis.vhf(a)gmail.com
73 de Peter
VA3ELE FN03dm
As I am located at 66 degrees North, freezing conditions can be expected at least 6 months per year. This also means that substantial amounts of frost, snow and ice accumulates on the antennas. Since mid-December, my H-pol. antennas have been unusable due to ice build-up. Now also my V-pol. antennas have become unusable due to the same reason. While waiting for thaw weather, I have been looking for information how different antenna designs perform when detuned by ice build-up. This turned-out to be very difficult to find. The only exceptions are the UR5EAZ designs as hosted on the DG7YBN site.
Has anyone made simulations for the different designs to see how they perform when de-tuned by ice?
Are there any rules of thumb for evaluating performance for different designs in icy conditions?
Any other ideas on how to deal with ice build-up on antennas?
Mauritz / SM2BYC
Hello Gene,
I am QRV on 23 cm since 2016 but didn´t have opportunity to work anyone in UT.
Would be fine to work you there. Maybe with also missing CO nearby?
I guess I am not alone.
GL and HNY
73 Ivan OK1IL
___________________________________________________________
Message: 3
Date: Tue, 11 Jan 2022 18:26:28 +0000
From: "Gene Shea"<geneshea(a)gmail.com>
To:moon-net@mailman.pe1itr.com
Subject: [Moon-Net] Interest in Utah on 23cm?
Message-ID: <emfd1cf9ca-fb21-4228-8389-8e50df80f89a@desktop-den>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
It is looking like I'll be out with the camper come February/March, any
interest in working Utah via 23cm EME as I start back north in March?
Open to other bands too.
Gene, KB7Q
No Problem. I presume bring spade?
May not be completely fit - right arm playing up after yesterday and
painting the ceiling today!
Anyone else volunteerd?
Peter
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Sent: Tuesday, 11 Jan, 22 At 13:43
Subject: Moon-net Digest, Vol 556, Issue 2
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Today's Topics:
1. Antenna performance degradation due to ice (Mauritz Lahti)
2. Re: Antenna performance degradation due to ice (AOTA - CT7AFR)
3. Re: Antenna performance degradation due to ice (Mauritz Lahti)
4. Re: Antenna performance degradation due to ice (dj3jj(a)gmx.net)
5. Re: Antenna performance degradation due to ice (Mauritz Lahti)
----------------------------------------------------------------------
Message: 1
Date: Tue, 11 Jan 2022 11:32:45 +0000
From: Mauritz Lahti <sm2byc(a)hotmail.com>
To: "moon-net(a)mailman.pe1itr.com" <moon-net(a)mailman.pe1itr.com>
Subject: [Moon-Net] Antenna performance degradation due to ice
Message-ID:
<AS1P195MB1494E43459F7383772E6246D84519(a)AS1P195MB1494.EURP195.PROD.OUTLOOK.COM>
Content-Type: text/plain; charset="iso-8859-1"
As I am located at 66 degrees North, freezing conditions can be expected
at least 6 months per year. This also means that substantial amounts of
frost, snow and ice accumulates on the antennas. Since mid-December, my
H-pol. antennas have been unusable due to ice build-up. Now also my
V-pol. antennas have become unusable due to the same reason. While
waiting for thaw weather, I have been looking for information how
different antenna designs perform when detuned by ice build-up. This
turned-out to be very difficult to find. The only exceptions are the
UR5EAZ designs as hosted on the DG7YBN site.
Has anyone made simulations for the different designs to see how they
perform when de-tuned by ice?
Are there any rules of thumb for evaluating performance for different
designs in icy conditions?
Any other ideas on how to deal with ice build-up on antennas?
Mauritz / SM2BYC
We hope to be activating G4RFR on 10GHz EME during Tuesday afternoon and
onwards into the evening .
Activity start from 1500Hrs UTC .
12Ft dish + 200W output . IO90AS . Digital +CW +SSB available .
Will monitor HB9Q for any feedback /sheds etc .
73/HNY
John
G0API
Julian
G3YGF
Carl
G6NLC
Steve, KC4SW
Thanks for sharing. Very interesting.
So in 2013 I acquired a 8877 2 meter amp from Chuck, W7CS (sk).
According to Chuck this amp was one of two which were built by a couple
of engineers in the Eimac lab during 'off-hours.' I'm curious if you
have any knowledge of that. I know Chuck had his amp on the moon quite
a bit from California many years ago.
The amp was 'sort of' a W6PO design only with the tube horizontal making
the unit quite compact. I have some photos of the amp and my HB power
supply I built for it, here: http://alaska.net/~ptt/8877
73
Mike, KL6M BP51dc
http://kl6m.com/
On Fri, 7 Jan 2022 15:08:14 -0800, Stephen Hanselman via Moon-net
<moon-net(a)mailman.pe1itr.com> wrote:
Gary,
Maybe I can shed some light on the bad batches. Eimac, San Carlos, was
running flat out and the corporate folks wanted to expand the production
lines. So they built a new plant in Salt Lake City and started producing
tubes. Now here is where I lose absolute memory, I can’t remember if it
was 8877’s or all the tubes but…. They had an issue with poisoned
cathodes, which was tracked down to the environment around SLC. The
result was the cathodes were painted and “fixed” in San Carlos and then
sent on. Amazing what you heard around the break room table with Bob,
W6PO, Stan W6VW, Bill W6SAI, and a bunch of other folks. What a place
to work, actually I was at the blue cancer inside Eimac, CTC, doing
relatively low power SSAs (< 150W).
Steve, KC4SW
Sent from my iPad
On Jan 7, 2022, at 14:12, Gary Abercrombie via Moon-net
<moon-net(a)mailman.pe1itr.com> wrote:
I was about to say the same as the Eimac 8877 was the workhorse for MRI
machines before SSPA’s. This is why they are so plentiful and cheap on
the surplus market. Except for just a few bad batches, they are great
tubes.
Gary, N8CQ
Hello all:
A local ham is interested in 432MHz EME - he has asked me what can be expected to be worked with the following system:
Antenna - 4 K1FO 25s with 1/2 hardline phasing lines
Preamp - Gasfet - antenna mounted (manufacturer/specifications to be determined)
Amplifier - W6PQL 1 kW output
Feedline - 100 ' 7/8" hardline or 11 1/4" hardline
Radio - to be determined. Either a transverter with HF rig or something like FT991 to start.
I have been out of active EME for so long I don't have any idea what he could expect to work either in CW or WSJT.
If anyone can give an estimate of the number of stations, DXCC, etc., that are workable with a setup like this please let me know. Thank you and Happy New Year.
73, Chris W3CMP
Hello Al and the group
I did talk to several members of my eme group and they told me they are not willing to switch feeds between 13 and 23 in the winter night.
So preferred solution would be to run 13 cm ssb Funtest on the complete weekend 22/23 January and 23 cm the complete weekend 5./6. February
We are sure this will increase the number of active stations and decreases the number of technical issues.
Feedback would be welcome
Andreas DJ3JJ
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