Re: [amsat-bb] Arrow modification
Thanks for sharing Rick, it helps to compare notes. I have experienced the problem with a single coax feeding a full duplex Icom W32A HT as well as two separate coaxes feeding two radios. The front-end gets severely de-sensed esp when the V/U frequencies get close to harmonic relationship. I guess I need to investigate further.
73!Umesh, k6vug
On Wednesday, January 2, 2019, 5:00:36 PM PST, saguaroastro [email protected] wrote:
Umesh, I have not experienced any of that in either mode. In fact most of my contact with it were V/u. This is using a KW D7A or D72a 73Rick Tejera (K7TEJ)Saguaro Astronomy ClubWww.saguaroastro.orgThunderbird Astronomy ClubWww.w7tbc.org
-------- Original message --------From: [email protected] Date: 1/2/19 17:09 (GMT-07:00) To: Kenneth P Alexander [email protected] Cc: AMSAT -BB [email protected] Subject: Re: [amsat-bb] Arrow modification The WA5VJB models are great for UHF up and VHF down (assuming duplex ops), but get severe RX overload for VHF up and UHF down.
73! Umesh, k6vug
On Tuesday, January 1, 2019, 5:53:01 PM PST, Douglas Quagliana [email protected] wrote:
I'm not sure if anyone has modified an Arrow to put the elements in the same plane.
However, Kent's "cheap LEO" yagi puts the 2m and 70cm elements all in the same plane, so it can be done (if you know what you are doing.) See
http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf
73, Douglas KA2UPW/5
On Dec 31, 2018, at 9:37 PM, Kenneth P Alexander [email protected] wrote:
Hi Doug,
Simply moving them into the same plane will likely cause problems because the bands are harmonically related. The 2m elements will make a mess of the 70cm radiation pattern if they're in the same plane. That said, I did just stumble across a satellite yagi design where the elements were intentionally in the same plane. Only the 2m yagi is fed and a passive 70 cm driven element is placed close to the 2m driven element so the 2m element excites the 70 cm passive element, causing it to radiate on 70 cm. I believe it's called an open sleeve design. I think it was 3 elements on 2m and 3 or 4 elements on 70 cm. Sorry I didn't bookmark the page. I don't remember where I saw it. Hopefully someone else saw it and remembers.
Happy New Year,
Ken bueng-ken.com
On Tue, Jan 1, 2019 at 10:20 AM Douglas B Tabor via AMSAT-BB < [email protected]> wrote:
I’ve been using my well faded Arrow for 4 years. The boom is a much appreciated LIDstick so the old man can swing it as well as a 3 year old.
Has anyone modified the Arrow to have 2m and 70cm elements in the same plane (instead of stock 90 degrees)? I’m just curious what the performance result might be - I know it would be easier to get in and out of the RoverMobile instead of doing the twist-and-angle it out.
HNY and 73,
Doug, N6UA
Douglas Tabor [email protected]
Sent via [email protected]. 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 [email protected]. 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 [email protected]. 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 [email protected]. 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
Umesh, for reference, I built mine with Kent's diplexer (he calls it a band pass filter), so only one coax lead to the radio (D7a or D72a)
73Rick Tejera (K7TEJ)Saguaro Astronomy ClubWww.saguaroastro.orgThunderbird Astronomy ClubWww.w7tbc.org
-------- Original message --------From: [email protected] Date: 1/4/19 00:55 (GMT-07:00) To: saguaroastro [email protected] Cc: AMSAT -BB [email protected] Subject: Re: [amsat-bb] Arrow modification
Thanks for sharing Rick, it helps to compare notes. I have experienced the problem with a single coax feeding a full duplex Icom W32A HT as well as two separate coaxes feeding two radios. The front-end gets severely de-sensed esp when the V/U frequencies get close to harmonic relationship. I guess I need to investigate further.
73!Umesh, k6vug
On Wednesday, January 2, 2019, 5:00:36 PM PST, saguaroastro [email protected] wrote:
Umesh, I have not experienced any of that in either mode. In fact most of my contact with it were V/u. This is using a KW D7A or D72a 73Rick Tejera (K7TEJ)Saguaro Astronomy ClubWww.saguaroastro.orgThunderbird Astronomy ClubWww.w7tbc.org
-------- Original message --------From: [email protected] Date: 1/2/19 17:09 (GMT-07:00) To: Kenneth P Alexander [email protected] Cc: AMSAT -BB [email protected] Subject: Re: [amsat-bb] Arrow modification The WA5VJB models are great for UHF up and VHF down (assuming duplex ops), but get severe RX overload for VHF up and UHF down.
73! Umesh, k6vug
On Tuesday, January 1, 2019, 5:53:01 PM PST, Douglas Quagliana [email protected] wrote:
I'm not sure if anyone has modified an Arrow to put the elements in the same plane.
However, Kent's "cheap LEO" yagi puts the 2m and 70cm elements all in the same plane, so it can be done (if you know what you are doing.) See
http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf
73, Douglas KA2UPW/5
On Dec 31, 2018, at 9:37 PM, Kenneth P Alexander [email protected] wrote:
Hi Doug,
Simply moving them into the same plane will likely cause problems because the bands are harmonically related. The 2m elements will make a mess of the 70cm radiation pattern if they're in the same plane. That said, I did just stumble across a satellite yagi design where the elements were intentionally in the same plane. Only the 2m yagi is fed and a passive 70 cm driven element is placed close to the 2m driven element so the 2m element excites the 70 cm passive element, causing it to radiate on 70 cm. I believe it's called an open sleeve design. I think it was 3 elements on 2m and 3 or 4 elements on 70 cm. Sorry I didn't bookmark the page. I don't remember where I saw it. Hopefully someone else saw it and remembers.
Happy New Year,
Ken bueng-ken.com
On Tue, Jan 1, 2019 at 10:20 AM Douglas B Tabor via AMSAT-BB < [email protected]> wrote:
I’ve been using my well faded Arrow for 4 years. The boom is a much appreciated LIDstick so the old man can swing it as well as a 3 year old.
Has anyone modified the Arrow to have 2m and 70cm elements in the same plane (instead of stock 90 degrees)? I’m just curious what the performance result might be - I know it would be easier to get in and out of the RoverMobile instead of doing the twist-and-angle it out.
HNY and 73,
Doug, N6UA
Douglas Tabor [email protected]
Sent via [email protected]. 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 [email protected]. 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 [email protected]. 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 [email protected]. 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
At the risk of expanding the conversation... Has anyone looked at insulating the elements from the boom. An article from an antenna guru stated years ago mentioned the elements appeared to be the proper length for being insulated from the boom.
73, Joe kk0sd
-----Original Message----- From: AMSAT-BB [email protected] On Behalf Of [email protected] Sent: Friday, January 4, 2019 1:56 AM To: saguaroastro [email protected] Cc: AMSAT -BB [email protected] Subject: Re: [amsat-bb] Arrow modification
Thanks for sharing Rick, it helps to compare notes. I have experienced the problem with a single coax feeding a full duplex Icom W32A HT as well as two separate coaxes feeding two radios. The front-end gets severely de-sensed esp when the V/U frequencies get close to harmonic relationship. I guess I need to investigate further.
73!Umesh, k6vug
On Wednesday, January 2, 2019, 5:00:36 PM PST, saguaroastro [email protected] wrote:
Umesh, I have not experienced any of that in either mode. In fact most of my contact with it were V/u. This is using a KW D7A or D72a 73Rick Tejera (K7TEJ)Saguaro Astronomy ClubWww.saguaroastro.orgThunderbird Astronomy ClubWww.w7tbc.org
-------- Original message --------From: [email protected] Date: 1/2/19 17:09 (GMT-07:00) To: Kenneth P Alexander [email protected] Cc: AMSAT -BB [email protected] Subject: Re: [amsat-bb] Arrow modification The WA5VJB models are great for UHF up and VHF down (assuming duplex ops), but get severe RX overload for VHF up and UHF down.
73! Umesh, k6vug
On Tuesday, January 1, 2019, 5:53:01 PM PST, Douglas Quagliana [email protected] wrote:
I'm not sure if anyone has modified an Arrow to put the elements in the same plane.
However, Kent's "cheap LEO" yagi puts the 2m and 70cm elements all in the same plane, so it can be done (if you know what you are doing.) See
http://www.wa5vjb.com/references/Cheap%20Antennas-LEOs.pdf
73, Douglas KA2UPW/5
On Dec 31, 2018, at 9:37 PM, Kenneth P Alexander [email protected] wrote:
Hi Doug,
Simply moving them into the same plane will likely cause problems because the bands are harmonically related. The 2m elements will make a mess of the 70cm radiation pattern if they're in the same plane. That said, I did just stumble across a satellite yagi design where the elements were intentionally in the same plane. Only the 2m yagi is fed and a passive 70 cm driven element is placed close to the 2m driven element so the 2m element excites the 70 cm passive element, causing it to radiate on 70 cm. I believe it's called an open sleeve design. I think it was 3 elements on 2m and 3 or 4 elements on 70 cm. Sorry I didn't bookmark the page. I don't remember where I saw it. Hopefully someone else saw it and remembers.
Happy New Year,
Ken bueng-ken.com
On Tue, Jan 1, 2019 at 10:20 AM Douglas B Tabor via AMSAT-BB < [email protected]> wrote:
I’ve been using my well faded Arrow for 4 years. The boom is a much appreciated LIDstick so the old man can swing it as well as a 3 year old.
Has anyone modified the Arrow to have 2m and 70cm elements in the same plane (instead of stock 90 degrees)? I’m just curious what the performance result might be - I know it would be easier to get in and out of the RoverMobile instead of doing the twist-and-angle it out.
HNY and 73,
Doug, N6UA
Douglas Tabor [email protected]
Sent via [email protected]. 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 [email protected]. 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 [email protected]. 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 [email protected]. 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 [email protected]. 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
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