Re: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
I have made numerous AO-85, 91, 92, and SO-50 contacts from my truck, mostly while stationary due to the desire to log the contacts, with a 25 year old Kenwood TM-733a (~25 watts) and a dual-band antenna on the roof of the truck. Even a simple 2m quarter-wave works fine and offers a decent match on 435 MHz.
The feature that helps the most is the radio's full duplex capability. When I hear my own voice on the downlink frequency I know I'm hitting the bird.
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of John Geiger Sent: Friday, June 29, 2018 3:03 PM To: AMSAT Subject: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
I am hoping to get into mobile satellite operations soon, and at times I will be able to operate portable with a dualband yagi antenna. . Other times, though, I will be on family trips and unable to stop for satellite passes, so would have to operate while in motion. Are AO91, AO91, and the XW-2 satellites able to be worked using a 1/4 wave or 5/8 wave dualband mobile whip antenna?
73 John AF5CC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Hi Dave,
That is great to know. Sounds like it would work. I wonder if a 1/4 wave antenna might be better than a 5/8 wave as it might have some higher lobes as well and cover more of the pass. Does anyone know about this?
73 John AF5CC
On Fri, Jun 29, 2018 at 8:20 PM, David Quick david.quick@frontiernet.net wrote:
I have made numerous AO-85, 91, 92, and SO-50 contacts from my truck, mostly while stationary due to the desire to log the contacts, with a 25 year old Kenwood TM-733a (~25 watts) and a dual-band antenna on the roof of the truck. Even a simple 2m quarter-wave works fine and offers a decent match on 435 MHz.
The feature that helps the most is the radio's full duplex capability. When I hear my own voice on the downlink frequency I know I'm hitting the bird.
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of John Geiger Sent: Friday, June 29, 2018 3:03 PM To: AMSAT Subject: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
I am hoping to get into mobile satellite operations soon, and at times I will be able to operate portable with a dualband yagi antenna. . Other times, though, I will be on family trips and unable to stop for satellite passes, so would have to operate while in motion. Are AO91, AO91, and the XW-2 satellites able to be worked using a 1/4 wave or 5/8 wave dualband mobile whip antenna?
73 John AF5CC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Would you want higher lobes? It seems like there is more db loss closer to the horizon and much less as you get overhead. That was my first thought, but it is just a guess, I am interested to hear what people with more education and experience have to say. Interesting topic thanks for bringing it up John.
R.J. WY7AA
On Sat, Jun 30, 2018 at 11:43 AM, John Geiger af5cc2@gmail.com wrote:
Hi Dave,
That is great to know. Sounds like it would work. I wonder if a 1/4 wave antenna might be better than a 5/8 wave as it might have some higher lobes as well and cover more of the pass. Does anyone know about this?
73 John AF5CC
On Fri, Jun 29, 2018 at 8:20 PM, David Quick david.quick@frontiernet.net wrote:
I have made numerous AO-85, 91, 92, and SO-50 contacts from my truck, mostly while stationary due to the desire to log the contacts, with a 25 year
old
Kenwood TM-733a (~25 watts) and a dual-band antenna on the roof of the truck. Even a simple 2m quarter-wave works fine and offers a decent match on 435 MHz.
The feature that helps the most is the radio's full duplex capability.
When
I hear my own voice on the downlink frequency I know I'm hitting the
bird.
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of John Geiger Sent: Friday, June 29, 2018 3:03 PM To: AMSAT Subject: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
I am hoping to get into mobile satellite operations soon, and at times I will be able to operate portable with a dualband yagi antenna. . Other times, though, I will be on family trips and unable to stop for satellite passes, so would have to operate while in motion. Are AO91, AO91, and
the
XW-2 satellites able to be worked using a 1/4 wave or 5/8 wave dualband mobile whip antenna?
73 John AF5CC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions
expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Darn right. When a LEO satellite is near the horizon, it is 1500 miles or more away. When it is above 45 degrees it is maybe half as close adn that is 6 dB dfference. When it is overhead it is 10 dB closer.
See: http://aprs.org/LEO-tracking.html
bob
On Sat, Jun 30, 2018 at 12:42 PM, Robert Bragg airrj1@gmail.com wrote:
Would you want higher lobes? It seems like there is more db loss closer to the horizon and much less as you get overhead. That was my first thought, but it is just a guess, I am interested to hear what people with more education and experience have to say. Interesting topic thanks for bringing it up John.
R.J. WY7AA
On Sat, Jun 30, 2018 at 11:43 AM, John Geiger af5cc2@gmail.com wrote:
Hi Dave,
That is great to know. Sounds like it would work. I wonder if a 1/4
wave
antenna might be better than a 5/8 wave as it might have some higher
lobes
as well and cover more of the pass. Does anyone know about this?
73 John AF5CC
On Fri, Jun 29, 2018 at 8:20 PM, David Quick <
david.quick@frontiernet.net>
wrote:
I have made numerous AO-85, 91, 92, and SO-50 contacts from my truck, mostly while stationary due to the desire to log the contacts, with a 25 year
old
Kenwood TM-733a (~25 watts) and a dual-band antenna on the roof of the truck. Even a simple 2m quarter-wave works fine and offers a decent
match
on 435 MHz.
The feature that helps the most is the radio's full duplex capability.
When
I hear my own voice on the downlink frequency I know I'm hitting the
bird.
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of John Geiger Sent: Friday, June 29, 2018 3:03 PM To: AMSAT Subject: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
I am hoping to get into mobile satellite operations soon, and at times
I
will be able to operate portable with a dualband yagi antenna. . Other times, though, I will be on family trips and unable to stop for
satellite
passes, so would have to operate while in motion. Are AO91, AO91, and
the
XW-2 satellites able to be worked using a 1/4 wave or 5/8 wave dualband mobile whip antenna?
73 John AF5CC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions
expressed are solely those of the author, and do not reflect the official views
of
AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership.
Opinions
expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite
program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
When Doug Wheelock KB5BOC was on the ISS, I tried many times to work him when using a 5/8 whip on the car but with no success. I then changed to a 1/4-wave whip and worked him first call. I attributed this to the fact that with a 5/8 the major lobe is towards the horizon whereas a 1/4-wave has a lobe tilted further upwards.
Regards, Keith G0RQQ
Sent from my BlackBerry 10 smartphone on the O2 network. Original Message From: John Geiger Sent: Saturday, 30 June 2018 16:44 To: David Quick Cc: AMSAT Subject: Re: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
Hi Dave,
That is great to know. Sounds like it would work. I wonder if a 1/4 wave antenna might be better than a 5/8 wave as it might have some higher lobes as well and cover more of the pass. Does anyone know about this?
73 John AF5CC
On Fri, Jun 29, 2018 at 8:20 PM, David Quick david.quick@frontiernet.net wrote:
I have made numerous AO-85, 91, 92, and SO-50 contacts from my truck, mostly while stationary due to the desire to log the contacts, with a 25 year old Kenwood TM-733a (~25 watts) and a dual-band antenna on the roof of the truck. Even a simple 2m quarter-wave works fine and offers a decent match on 435 MHz.
The feature that helps the most is the radio's full duplex capability. When I hear my own voice on the downlink frequency I know I'm hitting the bird.
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of John Geiger Sent: Friday, June 29, 2018 3:03 PM To: AMSAT Subject: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
I am hoping to get into mobile satellite operations soon, and at times I will be able to operate portable with a dualband yagi antenna. . Other times, though, I will be on family trips and unable to stop for satellite passes, so would have to operate while in motion. Are AO91, AO91, and the XW-2 satellites able to be worked using a 1/4 wave or 5/8 wave dualband mobile whip antenna?
73 John AF5CC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
I have a couple TM 733 A's. They are full duplex and I have also made contact with them in the vehicle on a dual band antenna. They're still around sometimes on eBay and I think is one of the best radios that Kenwood ever made.
the Kenwood th 7 9 handheld portable 5 watt is also full duplex. In fact you can turn it into a repeater cross band repeater and hanging from a tree and have a real nice portable repeater system.
Sent from ProtonMail mobile
-------- Original Message -------- On Jun 29, 2018, 8:20 PM, David Quick wrote:
I have made numerous AO-85, 91, 92, and SO-50 contacts from my truck, mostly while stationary due to the desire to log the contacts, with a 25 year old Kenwood TM-733a (~25 watts) and a dual-band antenna on the roof of the truck. Even a simple 2m quarter-wave works fine and offers a decent match on 435 MHz.
The feature that helps the most is the radio's full duplex capability. When I hear my own voice on the downlink frequency I know I'm hitting the bird.
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of John Geiger Sent: Friday, June 29, 2018 3:03 PM To: AMSAT Subject: [amsat-bb] AO91, AO92 and XW-2 sats with mobile whips
I am hoping to get into mobile satellite operations soon, and at times I will be able to operate portable with a dualband yagi antenna. . Other times, though, I will be on family trips and unable to stop for satellite passes, so would have to operate while in motion. Are AO91, AO91, and the XW-2 satellites able to be worked using a 1/4 wave or 5/8 wave dualband mobile whip antenna?
73 John AF5CC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: [http://www.amsat.org/mailman/listinfo/amsat-bb%5D(<a href=)">http://www.amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: [http://www.amsat.org/mailman/listinfo/amsat-bb%5D(<a href=)">http://www.amsat.org/mailman/listinfo/amsat-bb
participants (6)
-
David Quick -
Doug Phelps -
John Geiger -
Keith Ballinger -
Robert Bragg -
Robert Bruninga