I just checked the SWR using my FT-817ND's built in meter. I connected directly from the 817 to the appropriate connector on the Arrow.
At 435 MHz the SWR meter shows 5 bars, which doesn't sound good to me.
At 145 MHz I get a very brief indication of 6(?) bars and then the the bars immediately disappear. This sounds to me like a protection circuit engaging, and subsequent presses of the mic button produces no output. It also explains why I practically never get into SO-50.
The FT-817 manual is silent on the meaning of the bars on the SWR meter. Does anybody have an knowledge of the 817's SWR meter that they could pass along to me? Any assistance would be very gratefully received!
Many thanks in advance,
Ken VE3HLS
If it's anything like my 857, one bar is about 1.5:1. Anything above two bars and I start looking for problems.
73, Roger W7TZ CN83ia
On Fri, Mar 31, 2017 at 5:24 PM, Ken Alexander [email protected] wrote:
I just checked the SWR using my FT-817ND's built in meter. I connected directly from the 817 to the appropriate connector on the Arrow.
At 435 MHz the SWR meter shows 5 bars, which doesn't sound good to me.
At 145 MHz I get a very brief indication of 6(?) bars and then the the bars immediately disappear. This sounds to me like a protection circuit engaging, and subsequent presses of the mic button produces no output. It also explains why I practically never get into SO-50.
The FT-817 manual is silent on the meaning of the bars on the SWR meter. Does anybody have an knowledge of the 817's SWR meter that they could pass along to me? Any assistance would be very gratefully received!
Many thanks in advance,
Ken VE3HLS
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
Thanks Roger! Just reading up on how to adjust a gamma match in the field...sigh!
73,
Ken VE3HLS
On 2017-03-31 8:33 PM, Roger wrote:
If it's anything like my 857, one bar is about 1.5:1. Anything above two bars and I start looking for problems.
73, Roger W7TZ CN83ia
On Fri, Mar 31, 2017 at 5:24 PM, Ken Alexander <[email protected] mailto:[email protected]> wrote:
I just checked the SWR using my FT-817ND's built in meter. I connected directly from the 817 to the appropriate connector on the Arrow. At 435 MHz the SWR meter shows 5 bars, which doesn't sound good to me. At 145 MHz I get a very brief indication of 6(?) bars and then the the bars immediately disappear. This sounds to me like a protection circuit engaging, and subsequent presses of the mic button produces no output. It also explains why I practically never get into SO-50. The FT-817 manual is silent on the meaning of the bars on the SWR meter. Does anybody have an knowledge of the 817's SWR meter that they could pass along to me? Any assistance would be very gratefully received! Many thanks in advance, Ken VE3HLS _______________________________________________ Sent via [email protected] <mailto:[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 <http://www.amsat.org/mailman/listinfo/amsat-bb>
I had high SWR on my Arrow one time and it was because the screw on the gamma match came loose. Tightening it fixed it.
73, John Brier KG4AKV
On Mar 31, 2017 8:41 PM, "Ken Alexander" [email protected] wrote:
Thanks Roger! Just reading up on how to adjust a gamma match in the field...sigh!
73,
Ken VE3HLS
On 2017-03-31 8:33 PM, Roger wrote:
If it's anything like my 857, one bar is about 1.5:1. Anything above two bars and I start looking for problems.
73, Roger W7TZ CN83ia
On Fri, Mar 31, 2017 at 5:24 PM, Ken Alexander <[email protected] mailto:[email protected]> wrote:
I just checked the SWR using my FT-817ND's built in meter. I connected directly from the 817 to the appropriate connector on the Arrow. At 435 MHz the SWR meter shows 5 bars, which doesn't sound good to me. At 145 MHz I get a very brief indication of 6(?) bars and then the the bars immediately disappear. This sounds to me like a protection circuit engaging, and subsequent presses of the mic button produces no output. It also explains why I practically never get into SO-50. The FT-817 manual is silent on the meaning of the bars on the SWR meter. Does anybody have an knowledge of the 817's SWR meter that they could pass along to me? Any assistance would be very gratefully received! Many thanks in advance, Ken VE3HLS _______________________________________________ Sent via [email protected] <mailto:[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 <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
If the red cap comes out of the end, it's easy to short it too.
Seems unlikely it would be a gamma match issue with both sides at the same time though.
73,
Paul, N8HM
On Fri, Mar 31, 2017 at 8:45 PM, John Brier [email protected] wrote:
I had high SWR on my Arrow one time and it was because the screw on the gamma match came loose. Tightening it fixed it.
73, John Brier KG4AKV
On Mar 31, 2017 8:41 PM, "Ken Alexander" [email protected] wrote:
Thanks Roger! Just reading up on how to adjust a gamma match in the field...sigh!
73,
Ken VE3HLS
On 2017-03-31 8:33 PM, Roger wrote:
If it's anything like my 857, one bar is about 1.5:1. Anything above two bars and I start looking for problems.
73, Roger W7TZ CN83ia
On Fri, Mar 31, 2017 at 5:24 PM, Ken Alexander <[email protected] mailto:[email protected]> wrote:
I just checked the SWR using my FT-817ND's built in meter. I connected directly from the 817 to the appropriate connector on the Arrow. At 435 MHz the SWR meter shows 5 bars, which doesn't sound good tome.
At 145 MHz I get a very brief indication of 6(?) bars and then the the bars immediately disappear. This sounds to me like a protection circuit engaging, and subsequent presses of the mic button produces no output. It also explains why I practically never get into SO-50. The FT-817 manual is silent on the meaning of the bars on the SWR meter. Does anybody have an knowledge of the 817's SWR meter that they could pass along to me? Any assistance would be very gratefully received! Many thanks in advance, Ken VE3HLS _______________________________________________ Sent via [email protected] <mailto:[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 <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
Problems I experienced in the past with my Arrow: - The 2m & 70cm cables were transposed at the XCVR. - The center pin on the 70cm feedline BNC at the antenna was pushed back and not contacting at the Gamma Match. - The Driven Element rod on the side opposite the Gamma side worked loose and was not contacting the boom. Simple problems, but quite vexing until identified & fixed Bob K8BL
From: Paul Stoetzer [email protected] To: John Brier [email protected] Cc: AMSAT BB [email protected] Sent: Friday, March 31, 2017 8:47 PM Subject: Re: [amsat-bb] Problems with my Arrow
If the red cap comes out of the end, it's easy to short it too.
Seems unlikely it would be a gamma match issue with both sides at the same time though.
73,
Paul, N8HM
On Fri, Mar 31, 2017 at 8:45 PM, John Brier [email protected] wrote:
I had high SWR on my Arrow one time and it was because the screw on the gamma match came loose. Tightening it fixed it.
73, John Brier KG4AKV
On Mar 31, 2017 8:41 PM, "Ken Alexander" [email protected] wrote:
Thanks Roger! Just reading up on how to adjust a gamma match in the field...sigh!
73,
Ken VE3HLS
On 2017-03-31 8:33 PM, Roger wrote:
If it's anything like my 857, one bar is about 1.5:1. Anything above two bars and I start looking for problems.
73, Roger W7TZ CN83ia
On Fri, Mar 31, 2017 at 5:24 PM, Ken Alexander <[email protected] mailto:[email protected]> wrote:
I just checked the SWR using my FT-817ND's built in meter. I connected directly from the 817 to the appropriate connector on the Arrow.
At 435 MHz the SWR meter shows 5 bars, which doesn't sound good to
me.
At 145 MHz I get a very brief indication of 6(?) bars and then the the bars immediately disappear. This sounds to me like a protection circuit engaging, and subsequent presses of the mic button produces no output. It also explains why I practically never get into SO-50.
The FT-817 manual is silent on the meaning of the bars on the SWR meter. Does anybody have an knowledge of the 817's SWR meter that they could pass along to me? Any assistance would be very gratefully received!
Many thanks in advance,
Ken VE3HLS
_______________________________________________ Sent via [email protected] mailto:[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 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
If you can borrow a vhf/uhf watt meter you could get a better reading of the swr. Anything over 2.5 to 1 will cause the protection circuits to roll back the power output. You could then compare that with the published specs for the antenna. That would verify if you have a problem or not
GL Rolf NR0T
On Mar 31, 2017 7:27 PM, "Ken Alexander" [email protected] wrote:
I just checked the SWR using my FT-817ND's built in meter. I connected directly from the 817 to the appropriate connector on the Arrow.
At 435 MHz the SWR meter shows 5 bars, which doesn't sound good to me.
At 145 MHz I get a very brief indication of 6(?) bars and then the the bars immediately disappear. This sounds to me like a protection circuit engaging, and subsequent presses of the mic button produces no output. It also explains why I practically never get into SO-50.
The FT-817 manual is silent on the meaning of the bars on the SWR meter. Does anybody have an knowledge of the 817's SWR meter that they could pass along to me? Any assistance would be very gratefully received!
Many thanks in advance,
Ken VE3HLS
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
participants (6)
-
John Brier -
Ken Alexander -
Paul Stoetzer -
R.T.Liddy -
Roger -
Rolf Krogstad