Re: Mount an Arrow on rotator with 2m vertical or horizontal
I did it at field day last year, a couple of Arrow antennas with the 2 meter side set up for RHCP. Seemed to work real well on the analog birds. Some 75 ohm coax does the matching, see a picture at http://www.n0jy.org/images/IMG_20120623_215906.jpg The picture was taken at night, so look closely and you'll see a 1/4 wave 75 ohm section at the tee to both sides, the right side directly to the antenna and the left side to another 1/4 wave 50 ohm section connected to the antenna. Credit goes to SV1BSX I got the idea from his web site http://sv1bsx.50webs.com/antenna-pol/polarization.html
Jerry N0JY
On 4/16/2013 1:31 PM, Douglas Phelps wrote:
Any reason why, using identical coax lengths, you could not transform the impedance to 100 ohms and then use a T connector to sum both antenna signals and achieve 50 ohms to the radio? I know Transmit power will be 3 dB down at either antenna but is there any reason it will not work? Any antenna gurus out there?
From: R.T.Liddy [email protected] To: [email protected] Sent: Tue, April 16, 2013 11:46:35 AM Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal
For the Satellites, it completely doesn't matter. At any given moment, you only have 1 chance in 90 that you will have matching polarization.
So, if you plan to use the antenna for other than Satellites, set your polarization for that purpose (V for FM or H for SSB/CW).
My plan is to install 2 Elk antennas, one V and one H. Then, have a relay that I can switch between the two and choose the best downlink signal at any given moment. This arrangement will also give me optimum flexibility for terrestrial operation on 2 & 440.
Now, where can I find a relay to do that function?????
73/GL, Bob K8BL
--- On Tue, 4/16/13, Lee Maisel [email protected] wrote:
From: Lee Maisel [email protected] Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal To: "Don Hoover (WS4E)" [email protected] Cc: [email protected] Date: Tuesday, April 16, 2013, 12:24 AM
Hi Don,
I have mine mounted with 2m elements horizontal, because that's how it seems I used it most when it was handheld.
Lee W5LMM
Don Hoover (WS4E) wrote:
Just wondering, should I mount my arrow with the 2m elements oriented vertical or horizontal?
I am planning on putting it at 15deg and just using a az rotator.
Does it even matter which way its oriented since the polarity of the sats are always changing?
Maybe I should mount it like this: / instead.
Just curious what some thought was the best way to go. _______________________________________________ Sent via [email protected]. 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
It can work well. At w0wtn we did circular for VHF and UHF in 2005.
There is a picture of the setup here: http://www.w0wtn.org/img_browse.php?i=/images/field_day_2005/KK0SD_Sat_Ant.j pg
I took the phasing info straight from the Satellite Experimenter's Handbook.
You might notice the S Band cavity backed Helix as well :-)
73, Joe kk0sd
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of N0JY Sent: Tuesday, April 16, 2013 5:03 PM To: AMSAT-BB Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal
I did it at field day last year, a couple of Arrow antennas with the 2 meter side set up for RHCP. Seemed to work real well on the analog birds. Some 75 ohm coax does the matching, see a picture at http://www.n0jy.org/images/IMG_20120623_215906.jpg The picture was taken at night, so look closely and you'll see a 1/4 wave 75 ohm section at the tee to both sides, the right side directly to the antenna and the left side to another 1/4 wave 50 ohm section connected to the antenna. Credit goes to SV1BSX I got the idea from his web site http://sv1bsx.50webs.com/antenna-pol/polarization.html
Jerry N0JY
On 4/16/2013 1:31 PM, Douglas Phelps wrote:
Any reason why, using identical coax lengths, you could not transform the impedance to 100 ohms and then use a T connector to sum both antenna
signals and
achieve 50 ohms to the radio? I know Transmit power will be 3 dB down at
either
antenna but is there any reason it will not work? Any antenna gurus out
there?
From: R.T.Liddy [email protected] To: [email protected] Sent: Tue, April 16, 2013 11:46:35 AM Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal
For the Satellites, it completely doesn't matter. At any given moment, you only have 1 chance in 90 that you will have matching polarization.
So, if you plan to use the antenna for other than Satellites, set your polarization for that purpose (V for FM or H for SSB/CW).
My plan is to install 2 Elk antennas, one V and one H. Then, have a relay
that
I can switch between the two and choose the best downlink signal at any given moment. This arrangement will also give me optimum flexibility for terrestrial operation on 2 & 440.
Now, where can I find a relay to do that function?????
73/GL, Bob K8BL
--- On Tue, 4/16/13, Lee Maisel [email protected] wrote:
From: Lee Maisel [email protected] Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal
To: "Don Hoover (WS4E)" [email protected] Cc: [email protected] Date: Tuesday, April 16, 2013, 12:24 AM
Hi Don,
I have mine mounted with 2m elements horizontal, because that's how it seems I used it most when it was handheld.
Lee W5LMM
Don Hoover (WS4E) wrote:
Just wondering, should I mount my arrow with the 2m elements oriented vertical or horizontal?
I am planning on putting it at 15deg and just using a az rotator.
Does it even matter which way its oriented since the polarity of the sats are always changing?
Maybe I should mount it like this: / instead.
Just curious what some thought was the best way to go. _______________________________________________ Sent via [email protected]. 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
_______________________________________________ Sent via [email protected]. 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
Or check out the plans (from the AO-40 days) and build notes on how to build a circular phasing harness for the arrow 70cm crossed yagi on my website
http://home.comcast.net/~kb2m/
It also describes in detail how I used an MFJ 259 to fine tune the harness...
73 Jeff kb2m
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Gary "Joe" Mayfield Sent: Tuesday, April 16, 2013 20:52 PM To: 'AMSAT-BB' Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal
It can work well. At w0wtn we did circular for VHF and UHF in 2005.
There is a picture of the setup here: http://www.w0wtn.org/img_browse.php?i=/images/field_day_2005/KK0SD_Sat_Ant.j pg
I took the phasing info straight from the Satellite Experimenter's Handbook.
You might notice the S Band cavity backed Helix as well :-)
73, Joe kk0sd
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of N0JY Sent: Tuesday, April 16, 2013 5:03 PM To: AMSAT-BB Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal
I did it at field day last year, a couple of Arrow antennas with the 2 meter side set up for RHCP. Seemed to work real well on the analog birds. Some 75 ohm coax does the matching, see a picture at http://www.n0jy.org/images/IMG_20120623_215906.jpg The picture was taken at night, so look closely and you'll see a 1/4 wave 75 ohm section at the tee to both sides, the right side directly to the antenna and the left side to another 1/4 wave 50 ohm section connected to the antenna. Credit goes to SV1BSX I got the idea from his web site http://sv1bsx.50webs.com/antenna-pol/polarization.html
Jerry N0JY
On 4/16/2013 1:31 PM, Douglas Phelps wrote:
Any reason why, using identical coax lengths, you could not transform the impedance to 100 ohms and then use a T connector to sum both antenna
signals and
achieve 50 ohms to the radio? I know Transmit power will be 3 dB down at
either
antenna but is there any reason it will not work? Any antenna gurus out
there?
From: R.T.Liddy [email protected] To: [email protected] Sent: Tue, April 16, 2013 11:46:35 AM Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal
For the Satellites, it completely doesn't matter. At any given moment, you only have 1 chance in 90 that you will have matching polarization.
So, if you plan to use the antenna for other than Satellites, set your polarization for that purpose (V for FM or H for SSB/CW).
My plan is to install 2 Elk antennas, one V and one H. Then, have a relay
that
I can switch between the two and choose the best downlink signal at any given moment. This arrangement will also give me optimum flexibility for terrestrial operation on 2 & 440.
Now, where can I find a relay to do that function?????
73/GL, Bob K8BL
--- On Tue, 4/16/13, Lee Maisel [email protected] wrote:
From: Lee Maisel [email protected] Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or
horizontal
To: "Don Hoover (WS4E)" [email protected] Cc: [email protected] Date: Tuesday, April 16, 2013, 12:24 AM
Hi Don,
I have mine mounted with 2m elements horizontal, because that's how it seems I used it most when it was handheld.
Lee W5LMM
Don Hoover (WS4E) wrote:
Just wondering, should I mount my arrow with the 2m elements oriented vertical or horizontal?
I am planning on putting it at 15deg and just using a az rotator.
Does it even matter which way its oriented since the polarity of the sats are always changing?
Maybe I should mount it like this: / instead.
Just curious what some thought was the best way to go. _______________________________________________ Sent via [email protected]. 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
participants (3)
-
Gary "Joe" Mayfield -
Jeff KB2M -
N0JY