> I found a trunk mounted 2 meter half wave
>(dual bander) to work well when the satellite
> was behind me, but not at all overhead...
> I currently have a 2 meter quarter wave
> (dual bander) mounted... into the center
> of the roof. It works in all directions...
Any "gain" antenna on a car is not good for satellites. Because by definition, "gain" in a mobile means "gain" on the horizon where mobiles need it, and this means LOSS everywhere else. The better the antenna is for "mobile" the worse it is for satelliites. (basic law of physics)..
Eevn the "dual bander" 2 meter 1/4 wave has a decopuling loop for UHF, to keep the angle of UHF radition low on the horizon, because without it, the 1/4 2m whip is a 3/4 UHF whip and results in gain ABOVE 25 degrees which is BAD for terrestrial work (but GOOD by 2 dB or mnore for satellites).
So, when we say a 19.5" 1/4 wave 2m whip for mobile satellite, then that is all it is. No matching, no coils for UHF, no nothing. Just a 19.5" vertical whip. BUT for satellites, this 19.5" whip is also a 3/4 wave UHF whip which has almost 7 dBi of gain ABOVE 25 degrees which is where it really yields solid performance for LEO satellites when above 25 degrees.
A 5/8 wave 2m whip has a NULL at 15 degrees and so it is useless for satellites. They are too far away below 10 degrees to hear, and then there is the null up to say 45 degrees. And above that the satellite is only in view for 2 minutes or less! AND this antenna cannot be used on UHF at all.
So that is why the 19.5" vertical in the middle of the roof is the best for mobile satllite (and not all that hot for terrestrial... but useable, since repeaters are a lot closer).
See details about 75% down this page:
www.aprs.org/astars.html
Good luck.
Bob, Wb4APR
Hi Folks,
As previous notified on this list, the location of the AMSAT-UK Colloquium (25/26
July 2009) has been switched from Manchester to Guildford. This is to ensure the
best possible event for the largest number of visitors. The venue has been changed
to the Holiday Inn Hotel at Guildford - this is very close to the Surrey University
where the event has been held previously. It is just off the Cathedral roundabout on
the A3.
The 2009 AMSAT Colloquium will now commence at 10am on Saturday July 25th and close
at approximately 4.30 pm on the Sunday.
The new venue will enable visitors to attend at a significantly lower cost than last
year and experience greatly improved accommodation. The two days will be filled with
presentations covering all the latest amateur satellite happenings and developments.
The new GB4FUN trailer will also be in attendance and available to demonstrate
satellite operations.
An informal social gathering is planned for those who are able to arrive on the
Friday evening.
Full details of the booking arrangements are below. Members and non-members will be
equally welcome.
AMSAT-UK Colloquium 2009 - Booking Information
----------------------------------------------
The AMSAT-UK Colloquium 2009 will be held at the Holiday Inn, Egerton Road,
Guildford, GU2 7XZ, starting at 10am on Sat 25 July, and finishing at 4.30 pm on
Sunday 26 July 2009. The hotel is near to the Surrey University campus.
Special rates at the hotel have also been negotiated for the Friday and Sunday
nights should delegates wish to arrive early, or depart late.
To book your place at the Colloquium, YOU MUST BOOK WITH THE HOTEL. (Please do not
attempt to book with AMSAT-UK as in previous years)
The easiest way to do this is to phone the special Conference Office at the hotel on
+44 (0) 1483 784444 and quote reference R0F (That's R zero F). You must lodge your
credit card details with the hotel. If you wish to book over the internet, then
please email the hotel on meetings-guildford(a)ihg.com. PLEASE NOTE THAT IN ORDER TO
GUARANTEE A ROOM AT THE HOTEL FOR THE SAT NIGHT YOU MUST BOOK BEFORE FRIDAY 3 JULY.
Bookings for the Fri/Sun nights, or ones made after this date cannot be guaranteed.
YOU ARE ADVISED TO BOOK EARLY, AS THE HOTEL WILL ONLY HOLD A LIMITED NUMBER OF ROOMS
FOR US.
Costs
-----
The complete package, including tea/coffee, attendance at all presentations, a gala
dinner on Saturday evening, bed and breakfast on Sat pm/Sun morning is only UK
Pounds £128. This price does NOT include lunch, which may be taken at the hotel, or
elsewhere. (Cost of a three-course buffet style lunch at the hotel is £15,
alternatively the hotel offers bar meals/snacks)
The special rate for bed and breakfast on either Fri/Sat or Sun/Mon is UK pounds
£75.00 per night.
If you do not wish to stay at the hotel overnight (for example, if you live
locally), you can book attendance at the presentations at the rate of £25.00 per day
(includes tea/coffee, excludes lunch) and/or the Gala Dinner on Saturday evening at
£20.00. Again these booking must be made directly with the hotel.
Jim Heck, G3WGM
Hon Sec AMSAT-UK
At the request of several following my late night post, set forth below is the list I copied off this or the VX-8 listserv. I have added the new Alinco. I do not think this list is complete so others please feel free to add to it.
73s
Craig
N6RSX
HTs -
Icom IC-W2A
Icom IC-W31A
Icom IC-W32
Yaesu FT-470
Yaesu FT-530
Yaesu FT-50R
Yaesu FR-51R
Kenwood TH-D7
Kenwood TH-77
Kenwood TH-78
Alinco DJ-G5T
Alinco DJ-580T
Alinco DJ-G7
Mobile rigs -
Kenwood TM741
Kenwood TM742
Kenwood TM941
Kenwood TM942
Kenwood TM732
Kenwood TM-D700/710
Yaesu FT-5100
Yaesu FT-5200
Yaesu FT-8800
Yaesu FT-8900
Icom 2728H
Icom IC2800
Base rigs -
Yaesu FT-736
Yaesu FT-847
Kenwood TS-2000
Icom 820
Icom 821
Icom IC-910H
NOTICE: This communication may contain privileged or other confidential information. If you are not the intended recipient of this communication, or an employee or agent responsible for delivering this communication to the intended recipient, please advise the sender by reply email and immediately delete the message and any attachments without copying or disclosing the contents. Thank you.
--- On Sun, 31/5/09, Doug Faunt N6TQS +1-510-655-8604 <faunt(a)panix.com> wrote:
> Only for the next 5 days, as I send this. And it's
> not very good.
Hi Doug,
Yes for some reason the BBC only hold shows on the site for a few days.
I've just got home after being away for a few days and I see that as they don't do a podcast version it'll need converting to MP3 to listen to in the car tomorrow morning.
Must admit I'd never even heard of the Judica-Cordiglia brothers before.
73 Trevor M5AKA
OK, Here's another oldie but a goodie:
Heathkit HW-24 or HW-24A.
This is a dual band FM mobile rig, the "A" model is 25 watts, the plain
model is
10 watts.
This is NOT a kit radio, it was factory built, I have had one for about
20 years,
and used it a lot on satellite FM work. It also does cross-band repeat
and does work
great for doing FM satellite work, you can hear your own signal on the
downlink. It has
separate co-ax connectors for VHF/UHF.
It also has memories, P.L. encode and decode, blue flourescent readout,
etc.
73,
John, K6YK
===============================================================
On Sun, 31 May 2009 15:42:12 -0700 "D. Craig Fox" <DFox(a)rwglaw.com>
writes:
> At the request of several following my late night post, set forth
> below is the list I copied off this or the VX-8 listserv. I have
> added the new Alinco. I do not think this list is complete so
> others please feel free to add to it.
>
> 73s
>
> Craig
> N6RSX
>
> HTs -
> Icom IC-W2A
> Icom IC-W31A
> Icom IC-W32
> Yaesu FT-470
> Yaesu FT-530
> Yaesu FT-50R
> Yaesu FR-51R
> Kenwood TH-D7
> Kenwood TH-77
> Kenwood TH-78
> Alinco DJ-G5T
> Alinco DJ-580T
> Alinco DJ-G7
>
>
> Mobile rigs -
> Kenwood TM741
> Kenwood TM742
> Kenwood TM941
> Kenwood TM942
> Kenwood TM732
> Kenwood TM-D700/710
> Yaesu FT-5100
> Yaesu FT-5200
> Yaesu FT-8800
> Yaesu FT-8900
> Icom 2728H
> Icom IC2800
>
> Base rigs -
> Yaesu FT-736
> Yaesu FT-847
> Kenwood TS-2000
> Icom 820
> Icom 821
> Icom IC-910H
> NOTICE: This communication may contain privileged or other
> confidential information. If you are not the intended recipient of
> this communication, or an employee or agent responsible for
> delivering this communication to the intended recipient, please
> advise the sender by reply email and immediately delete the message
> and any attachments without copying or disclosing the contents.
> Thank you.
>
> _______________________________________________
> Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the
> author.
> Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
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