Re: [Elecraft] KAT500 Re-Tuning
If the band lines are used only, the ATU picks a mid band freq if there is no history since last ATU power up. On first tx after that, it performs a memory recall tune using the counted freq. Power up means DC power applied. A k3 can provide approx freq on RX thru the ACC cable, depending on a menu setting Dick, K6KR > On Nov 15, 2015, at 16:20, Cliff Frescura <c...@cfcorp.com> wrote: > > I went back and reviewed the KAT500 command set and it doesn't look like > this is possible because the serial protocol does not have a way to > communicate split status. I've been knee deep in the KPA500 serial protocol > (with great results thanks to Jack W6FB) and thought they may have some high > level similarities, but not really. > > Do you know how the KAT500 interprets frequency, if driving only the band > data lines (BAND0-3) via an external TTL device? Does it pick middle of the > band if there is no last used frequency? > > 73, > > Cliff K3LL > > -Original Message- > From: Cliff Frescura [mailto:c...@cfcorp.com] > Sent: Sunday, November 15, 2015 2:58 PM > To: 'Cady, Fred'; 'Elecraft@mailman.qth.net' > Subject: RE: [Elecraft] KAT500 Re-Tuning > > Apparently yes. However, I'm using the KAT500 serial port to communicate > frequency to the KAT500 via logging software (DXLabs), not auxBus, since the > radio is not a K3/S. > > 73, > > Cliff K3LL > > -Original Message- > From: Cady, Fred [mailto:fc...@montana.edu] > Sent: Sunday, November 15, 2015 2:28 PM > To: Cliff Frescura; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500 Re-Tuning > > Are you asking for the KAT500 to choose two different tuning solutions when > operating split? At present it chooses the VFO B frequency for its solution > according to: > > MCU 4.83 / DSP 2.82, 2-8-2014 > > * FSK-D (RTTY) POWER-CONTROL BUG FIX: Power output can now be increased > while in transmit mode when using FSK-D. > > * KAT500 ATU SUPPORT: Automatic retuning of KAT500 LC network as K3 VFO is > moved. VFO frequency messages are sent via the auxBus. Sends VFO A frequency > except in SPLIT mode, where VFO B frequency is sent. > > Cheers, > Fred KE7X > www.ke7x.com for all KE7X Elecraft books. > > From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Cliff > Frescura <c...@cfcorp.com> > Sent: Sunday, November 15, 2015 3:09 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500 Re-Tuning > > Antenna issues specific to the OP aside, there is a valid reason to have the > KAT500 recognize split and inhibit retuning/recall. > > The need for this functionality is very apparent when running split on 40m > SSB when the DX is below 7.1 MHz and listening up much higher than 5KHz for > anyone using a narrow bandwidth 40m antenna. Consider that the KAT500 > already tuned the antenna on your TX, so the "fix the antenna solution" > doesn't apply. Listening ~50KHz away should not require any retuning since > the tuner's settings at your TX should be good enough for RX. > > Here is how it would work: > > 1. When the KAT500 sees a *transition* from split off to split on... >a. The KAT500 would recall settings for TX Frequency or retune > (under the VSWR settings condition) when it sees RF for the first time after > this split transition 2. When split is on (Split mode) >b. The tuner should not change any settings regardless of > frequency/band - except under VSWR conditions based on settings. >c. Perhaps both the "Auto" and "Man" indicators would be on in order > to indicate this mode on the KAT front panel. > 3. When the KAT500 sees a transition from split on to split off then go into > "normal" (non Split) mode. > > The main reason I am using the tuner is because of a compromise antenna. If > the antenna was flat enough across the band I wouldn't even engage it. In > my specific situation there is also at KPA500 connected, so the way that the > KAT500 works today will result in the KAT inhibiting the KPA while it > retunes/recalls. Although fast, I suspect that the amp is not engaged > initially when I send (speak) my call sign in the pile. On very rare > occasions there is also a KPA VSWR Fault. While probably not an issue, the > amount of relay chatter in very short period of time between fast RX/TX/RX > transitions is a bit unsettling. > > 73, > > Cliff K3LL > > > -Original Message- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim > Brown > Sent: Sunday, November 15, 2015 10:04 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500
Re: [Elecraft] KAT500 Re-Tuning
Thanks -this is helpful information. If going the hardware route, I am inclined to implement the logic via an RS-232 wedge device vs implementing a BAND0-3 device (basically an antenna switch). 73, Cliff K3LL/6 -Original Message- From: Dick Dievendorff [mailto:d...@elecraft.com] Sent: Monday, November 16, 2015 9:36 PM To: Cliff Frescura Cc: Cady, Fred; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning If the band lines are used only, the ATU picks a mid band freq if there is no history since last ATU power up. On first tx after that, it performs a memory recall tune using the counted freq. Power up means DC power applied. A k3 can provide approx freq on RX thru the ACC cable, depending on a menu setting Dick, K6KR > On Nov 15, 2015, at 16:20, Cliff Frescura <c...@cfcorp.com> wrote: > > I went back and reviewed the KAT500 command set and it doesn't look > like this is possible because the serial protocol does not have a way > to communicate split status. I've been knee deep in the KPA500 serial > protocol (with great results thanks to Jack W6FB) and thought they may > have some high level similarities, but not really. > > Do you know how the KAT500 interprets frequency, if driving only the > band data lines (BAND0-3) via an external TTL device? Does it pick > middle of the band if there is no last used frequency? > > 73, > > Cliff K3LL > > -Original Message- > From: Cliff Frescura [mailto:c...@cfcorp.com] > Sent: Sunday, November 15, 2015 2:58 PM > To: 'Cady, Fred'; 'Elecraft@mailman.qth.net' > Subject: RE: [Elecraft] KAT500 Re-Tuning > > Apparently yes. However, I'm using the KAT500 serial port to > communicate frequency to the KAT500 via logging software (DXLabs), not > auxBus, since the radio is not a K3/S. > > 73, > > Cliff K3LL > > -Original Message- > From: Cady, Fred [mailto:fc...@montana.edu] > Sent: Sunday, November 15, 2015 2:28 PM > To: Cliff Frescura; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500 Re-Tuning > > Are you asking for the KAT500 to choose two different tuning solutions > when operating split? At present it chooses the VFO B frequency for > its solution according to: > > MCU 4.83 / DSP 2.82, 2-8-2014 > > * FSK-D (RTTY) POWER-CONTROL BUG FIX: Power output can now be > increased while in transmit mode when using FSK-D. > > * KAT500 ATU SUPPORT: Automatic retuning of KAT500 LC network as K3 > VFO is moved. VFO frequency messages are sent via the auxBus. Sends > VFO A frequency except in SPLIT mode, where VFO B frequency is sent. > > Cheers, > Fred KE7X > www.ke7x.com for all KE7X Elecraft books. > > From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Cliff > Frescura <c...@cfcorp.com> > Sent: Sunday, November 15, 2015 3:09 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KAT500 Re-Tuning > > Antenna issues specific to the OP aside, there is a valid reason to > have the > KAT500 recognize split and inhibit retuning/recall. > > The need for this functionality is very apparent when running split on > 40m SSB when the DX is below 7.1 MHz and listening up much higher than > 5KHz for anyone using a narrow bandwidth 40m antenna. Consider that > the KAT500 already tuned the antenna on your TX, so the "fix the antenna solution" > doesn't apply. Listening ~50KHz away should not require any retuning > since the tuner's settings at your TX should be good enough for RX. > > Here is how it would work: > > 1. When the KAT500 sees a *transition* from split off to split on... >a. The KAT500 would recall settings for TX Frequency or retune > (under the VSWR settings condition) when it sees RF for the first time > after this split transition 2. When split is on (Split mode) >b. The tuner should not change any settings regardless of > frequency/band - except under VSWR conditions based on settings. >c. Perhaps both the "Auto" and "Man" indicators would be on in > order to indicate this mode on the KAT front panel. > 3. When the KAT500 sees a transition from split on to split off then > go into "normal" (non Split) mode. > > The main reason I am using the tuner is because of a compromise > antenna. If the antenna was flat enough across the band I wouldn't > even engage it. In my specific situation there is also at KPA500 > connected, so the way that the > KAT500 works today will result in the KAT inhibiting the KPA while it > retunes/recalls. Although fast, I suspect that the amp is not engaged > initially when I send (speak) my call sign in the pile. On very rare > occasions
Re: [Elecraft] KAT500 Re-Tuning
Antenna issues specific to the OP aside, there is a valid reason to have the KAT500 recognize split and inhibit retuning/recall. The need for this functionality is very apparent when running split on 40m SSB when the DX is below 7.1 MHz and listening up much higher than 5KHz for anyone using a narrow bandwidth 40m antenna. Consider that the KAT500 already tuned the antenna on your TX, so the "fix the antenna solution" doesn't apply. Listening ~50KHz away should not require any retuning since the tuner's settings at your TX should be good enough for RX. Here is how it would work: 1. When the KAT500 sees a *transition* from split off to split on... a. The KAT500 would recall settings for TX Frequency or retune (under the VSWR settings condition) when it sees RF for the first time after this split transition 2. When split is on (Split mode) b. The tuner should not change any settings regardless of frequency/band - except under VSWR conditions based on settings. c. Perhaps both the "Auto" and "Man" indicators would be on in order to indicate this mode on the KAT front panel. 3. When the KAT500 sees a transition from split on to split off then go into "normal" (non Split) mode. The main reason I am using the tuner is because of a compromise antenna. If the antenna was flat enough across the band I wouldn't even engage it. In my specific situation there is also at KPA500 connected, so the way that the KAT500 works today will result in the KAT inhibiting the KPA while it retunes/recalls. Although fast, I suspect that the amp is not engaged initially when I send (speak) my call sign in the pile. On very rare occasions there is also a KPA VSWR Fault. While probably not an issue, the amount of relay chatter in very short period of time between fast RX/TX/RX transitions is a bit unsettling. 73, Cliff K3LL -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Sunday, November 15, 2015 10:04 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning On Sat,11/14/2015 8:37 PM, Byron Peebles wrote: > I will put the antenna analyzer on it tomorrow and make sure it's > still solid after all this wind. Other suggestions. First, put it on bypass and see what the SWR indication is. If it's reasonable, go to MAN mode, force a tuning (put K3 in TUN mode) and let it tune. Carefully check the entire coax path between K3 and the antenna. All connectors should be finger tight, then tighten with gas pliers. Any indication that the coax is wet? Moisture entering anywhere along the run will usually migrate all the way down to the lowest point. Open connectors to see if there's any moisture. A good way to test is to use a tissue or paper towel as a probe. If you have TDR capability, look at the feedline for any discontinuities. You should see connectors, the antenna, and any switching between the antenna and your test point. Most vector analyzers can do TDR. If you don't have one of them, ask around your ham neighbors to borrow one (and ask them to help you do the measurement). 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to c...@cfcorp.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAT500 Re-Tuning
Are you asking for the KAT500 to choose two different tuning solutions when operating split? At present it chooses the VFO B frequency for its solution according to: MCU 4.83 / DSP 2.82, 2-8-2014 * FSK-D (RTTY) POWER-CONTROL BUG FIX: Power output can now be increased while in transmit mode when using FSK-D. * KAT500 ATU SUPPORT: Automatic retuning of KAT500 LC network as K3 VFO is moved. VFO frequency messages are sent via the auxBus. Sends VFO A frequency except in SPLIT mode, where VFO B frequency is sent. Cheers, Fred KE7X www.ke7x.com for all KE7X Elecraft books. From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Cliff Frescura <c...@cfcorp.com> Sent: Sunday, November 15, 2015 3:09 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning Antenna issues specific to the OP aside, there is a valid reason to have the KAT500 recognize split and inhibit retuning/recall. The need for this functionality is very apparent when running split on 40m SSB when the DX is below 7.1 MHz and listening up much higher than 5KHz for anyone using a narrow bandwidth 40m antenna. Consider that the KAT500 already tuned the antenna on your TX, so the "fix the antenna solution" doesn't apply. Listening ~50KHz away should not require any retuning since the tuner's settings at your TX should be good enough for RX. Here is how it would work: 1. When the KAT500 sees a *transition* from split off to split on... a. The KAT500 would recall settings for TX Frequency or retune (under the VSWR settings condition) when it sees RF for the first time after this split transition 2. When split is on (Split mode) b. The tuner should not change any settings regardless of frequency/band - except under VSWR conditions based on settings. c. Perhaps both the "Auto" and "Man" indicators would be on in order to indicate this mode on the KAT front panel. 3. When the KAT500 sees a transition from split on to split off then go into "normal" (non Split) mode. The main reason I am using the tuner is because of a compromise antenna. If the antenna was flat enough across the band I wouldn't even engage it. In my specific situation there is also at KPA500 connected, so the way that the KAT500 works today will result in the KAT inhibiting the KPA while it retunes/recalls. Although fast, I suspect that the amp is not engaged initially when I send (speak) my call sign in the pile. On very rare occasions there is also a KPA VSWR Fault. While probably not an issue, the amount of relay chatter in very short period of time between fast RX/TX/RX transitions is a bit unsettling. 73, Cliff K3LL -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Sunday, November 15, 2015 10:04 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning On Sat,11/14/2015 8:37 PM, Byron Peebles wrote: > I will put the antenna analyzer on it tomorrow and make sure it's > still solid after all this wind. Other suggestions. First, put it on bypass and see what the SWR indication is. If it's reasonable, go to MAN mode, force a tuning (put K3 in TUN mode) and let it tune. Carefully check the entire coax path between K3 and the antenna. All connectors should be finger tight, then tighten with gas pliers. Any indication that the coax is wet? Moisture entering anywhere along the run will usually migrate all the way down to the lowest point. Open connectors to see if there's any moisture. A good way to test is to use a tissue or paper towel as a probe. If you have TDR capability, look at the feedline for any discontinuities. You should see connectors, the antenna, and any switching between the antenna and your test point. Most vector analyzers can do TDR. If you don't have one of them, ask around your ham neighbors to borrow one (and ask them to help you do the measurement). 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to c...@cfcorp.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to fc...@montana.edu __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted
Re: [Elecraft] KAT500 Re-Tuning
I went back and reviewed the KAT500 command set and it doesn't look like this is possible because the serial protocol does not have a way to communicate split status. I've been knee deep in the KPA500 serial protocol (with great results thanks to Jack W6FB) and thought they may have some high level similarities, but not really. Do you know how the KAT500 interprets frequency, if driving only the band data lines (BAND0-3) via an external TTL device? Does it pick middle of the band if there is no last used frequency? 73, Cliff K3LL -Original Message- From: Cliff Frescura [mailto:c...@cfcorp.com] Sent: Sunday, November 15, 2015 2:58 PM To: 'Cady, Fred'; 'Elecraft@mailman.qth.net' Subject: RE: [Elecraft] KAT500 Re-Tuning Apparently yes. However, I'm using the KAT500 serial port to communicate frequency to the KAT500 via logging software (DXLabs), not auxBus, since the radio is not a K3/S. 73, Cliff K3LL -Original Message- From: Cady, Fred [mailto:fc...@montana.edu] Sent: Sunday, November 15, 2015 2:28 PM To: Cliff Frescura; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning Are you asking for the KAT500 to choose two different tuning solutions when operating split? At present it chooses the VFO B frequency for its solution according to: MCU 4.83 / DSP 2.82, 2-8-2014 * FSK-D (RTTY) POWER-CONTROL BUG FIX: Power output can now be increased while in transmit mode when using FSK-D. * KAT500 ATU SUPPORT: Automatic retuning of KAT500 LC network as K3 VFO is moved. VFO frequency messages are sent via the auxBus. Sends VFO A frequency except in SPLIT mode, where VFO B frequency is sent. Cheers, Fred KE7X www.ke7x.com for all KE7X Elecraft books. From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Cliff Frescura <c...@cfcorp.com> Sent: Sunday, November 15, 2015 3:09 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning Antenna issues specific to the OP aside, there is a valid reason to have the KAT500 recognize split and inhibit retuning/recall. The need for this functionality is very apparent when running split on 40m SSB when the DX is below 7.1 MHz and listening up much higher than 5KHz for anyone using a narrow bandwidth 40m antenna. Consider that the KAT500 already tuned the antenna on your TX, so the "fix the antenna solution" doesn't apply. Listening ~50KHz away should not require any retuning since the tuner's settings at your TX should be good enough for RX. Here is how it would work: 1. When the KAT500 sees a *transition* from split off to split on... a. The KAT500 would recall settings for TX Frequency or retune (under the VSWR settings condition) when it sees RF for the first time after this split transition 2. When split is on (Split mode) b. The tuner should not change any settings regardless of frequency/band - except under VSWR conditions based on settings. c. Perhaps both the "Auto" and "Man" indicators would be on in order to indicate this mode on the KAT front panel. 3. When the KAT500 sees a transition from split on to split off then go into "normal" (non Split) mode. The main reason I am using the tuner is because of a compromise antenna. If the antenna was flat enough across the band I wouldn't even engage it. In my specific situation there is also at KPA500 connected, so the way that the KAT500 works today will result in the KAT inhibiting the KPA while it retunes/recalls. Although fast, I suspect that the amp is not engaged initially when I send (speak) my call sign in the pile. On very rare occasions there is also a KPA VSWR Fault. While probably not an issue, the amount of relay chatter in very short period of time between fast RX/TX/RX transitions is a bit unsettling. 73, Cliff K3LL -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Sunday, November 15, 2015 10:04 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning On Sat,11/14/2015 8:37 PM, Byron Peebles wrote: > I will put the antenna analyzer on it tomorrow and make sure it's > still solid after all this wind. Other suggestions. First, put it on bypass and see what the SWR indication is. If it's reasonable, go to MAN mode, force a tuning (put K3 in TUN mode) and let it tune. Carefully check the entire coax path between K3 and the antenna. All connectors should be finger tight, then tighten with gas pliers. Any indication that the coax is wet? Moisture entering anywhere along the run will usually migrate all the way down to the lowest point. Open connectors to see if there's any moisture. A good way to test is to use a tissue or paper towel as a probe. If you have TDR capability, look at the feedline for any discontinuities. You should see connectors, the antenna, and any switching between the antenna and your test point. Most vector analy
Re: [Elecraft] KAT500 Re-Tuning
Apparently yes. However, I'm using the KAT500 serial port to communicate frequency to the KAT500 via logging software (DXLabs), not auxBus, since the radio is not a K3/S. 73, Cliff K3LL -Original Message- From: Cady, Fred [mailto:fc...@montana.edu] Sent: Sunday, November 15, 2015 2:28 PM To: Cliff Frescura; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning Are you asking for the KAT500 to choose two different tuning solutions when operating split? At present it chooses the VFO B frequency for its solution according to: MCU 4.83 / DSP 2.82, 2-8-2014 * FSK-D (RTTY) POWER-CONTROL BUG FIX: Power output can now be increased while in transmit mode when using FSK-D. * KAT500 ATU SUPPORT: Automatic retuning of KAT500 LC network as K3 VFO is moved. VFO frequency messages are sent via the auxBus. Sends VFO A frequency except in SPLIT mode, where VFO B frequency is sent. Cheers, Fred KE7X www.ke7x.com for all KE7X Elecraft books. From: Elecraft <elecraft-boun...@mailman.qth.net> on behalf of Cliff Frescura <c...@cfcorp.com> Sent: Sunday, November 15, 2015 3:09 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning Antenna issues specific to the OP aside, there is a valid reason to have the KAT500 recognize split and inhibit retuning/recall. The need for this functionality is very apparent when running split on 40m SSB when the DX is below 7.1 MHz and listening up much higher than 5KHz for anyone using a narrow bandwidth 40m antenna. Consider that the KAT500 already tuned the antenna on your TX, so the "fix the antenna solution" doesn't apply. Listening ~50KHz away should not require any retuning since the tuner's settings at your TX should be good enough for RX. Here is how it would work: 1. When the KAT500 sees a *transition* from split off to split on... a. The KAT500 would recall settings for TX Frequency or retune (under the VSWR settings condition) when it sees RF for the first time after this split transition 2. When split is on (Split mode) b. The tuner should not change any settings regardless of frequency/band - except under VSWR conditions based on settings. c. Perhaps both the "Auto" and "Man" indicators would be on in order to indicate this mode on the KAT front panel. 3. When the KAT500 sees a transition from split on to split off then go into "normal" (non Split) mode. The main reason I am using the tuner is because of a compromise antenna. If the antenna was flat enough across the band I wouldn't even engage it. In my specific situation there is also at KPA500 connected, so the way that the KAT500 works today will result in the KAT inhibiting the KPA while it retunes/recalls. Although fast, I suspect that the amp is not engaged initially when I send (speak) my call sign in the pile. On very rare occasions there is also a KPA VSWR Fault. While probably not an issue, the amount of relay chatter in very short period of time between fast RX/TX/RX transitions is a bit unsettling. 73, Cliff K3LL -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Sunday, November 15, 2015 10:04 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KAT500 Re-Tuning On Sat,11/14/2015 8:37 PM, Byron Peebles wrote: > I will put the antenna analyzer on it tomorrow and make sure it's > still solid after all this wind. Other suggestions. First, put it on bypass and see what the SWR indication is. If it's reasonable, go to MAN mode, force a tuning (put K3 in TUN mode) and let it tune. Carefully check the entire coax path between K3 and the antenna. All connectors should be finger tight, then tighten with gas pliers. Any indication that the coax is wet? Moisture entering anywhere along the run will usually migrate all the way down to the lowest point. Open connectors to see if there's any moisture. A good way to test is to use a tissue or paper towel as a probe. If you have TDR capability, look at the feedline for any discontinuities. You should see connectors, the antenna, and any switching between the antenna and your test point. Most vector analyzers can do TDR. If you don't have one of them, ask around your ham neighbors to borrow one (and ask them to help you do the measurement). 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to c...@cfcorp.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net T
Re: [Elecraft] KAT500 Re-Tuning
On Sat,11/14/2015 8:37 PM, Byron Peebles wrote: I will put the antenna analyzer on it tomorrow and make sure it's still solid after all this wind. Other suggestions. First, put it on bypass and see what the SWR indication is. If it's reasonable, go to MAN mode, force a tuning (put K3 in TUN mode) and let it tune. Carefully check the entire coax path between K3 and the antenna. All connectors should be finger tight, then tighten with gas pliers. Any indication that the coax is wet? Moisture entering anywhere along the run will usually migrate all the way down to the lowest point. Open connectors to see if there's any moisture. A good way to test is to use a tissue or paper towel as a probe. If you have TDR capability, look at the feedline for any discontinuities. You should see connectors, the antenna, and any switching between the antenna and your test point. Most vector analyzers can do TDR. If you don't have one of them, ask around your ham neighbors to borrow one (and ask them to help you do the measurement). 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAT500 Re-Tuning
I will put the antenna analyzer on it tomorrow and make sure it's still solid after all this wind. On 11/14/2015 11:31 PM, Byron Peebles wrote: M2 Log Periodic flat from bottom to top. On 11/14/2015 05:34 PM, Jim Brown wrote: On Sat,11/14/2015 1:07 PM, Byron Peebles wrote: Once I tuned I was good for only about 2KHz. Any thoughts? Antenna has been fine everywhere else. What's the antenna? From the symptom, I suspect it's nowhere near resonance on 12m, and the KAT500 is jumping through hoops to get power into the feedline. And, if the antenna is a poor match to the feedline (which is why it would need a lot of tuning), the loss in the feedline is likely to be high. __ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAT500 Re-Tuning
M2 Log Periodic flat from bottom to top. On 11/14/2015 05:34 PM, Jim Brown wrote: On Sat,11/14/2015 1:07 PM, Byron Peebles wrote: Once I tuned I was good for only about 2KHz. Any thoughts? Antenna has been fine everywhere else. What's the antenna? From the symptom, I suspect it's nowhere near resonance on 12m, and the KAT500 is jumping through hoops to get power into the feedline. And, if the antenna is a poor match to the feedline (which is why it would need a lot of tuning), the loss in the feedline is likely to be high. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAT500 Re-Tuning
On Sat,11/14/2015 1:07 PM, Byron Peebles wrote: Once I tuned I was good for only about 2KHz. Any thoughts? Antenna has been fine everywhere else. What's the antenna? From the symptom, I suspect it's nowhere near resonance on 12m, and the KAT500 is jumping through hoops to get power into the feedline. And, if the antenna is a poor match to the feedline (which is why it would need a lot of tuning), the loss in the feedline is likely to be high. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAT500 Re-Tuning
Not to mention the losses in the tuner itself. My K3 can almost match on open antenna connection. If I were to transmit, guess where all the power would go. 73 Bill AE6JV On 11/14/15 at 2:34 PM, j...@audiosystemsgroup.com (Jim Brown) wrote: On Sat,11/14/2015 1:07 PM, Byron Peebles wrote: Once I tuned I was good for only about 2KHz. Any thoughts? Antenna has been fine everywhere else. What's the antenna? From the symptom, I suspect it's nowhere near resonance on 12m, and the KAT500 is jumping through hoops to get power into the feedline. And, if the antenna is a poor match to the feedline (which is why it would need a lot of tuning), the loss in the feedline is likely to be high. --- Bill Frantz| Concurrency is hard. 12 out | Periwinkle (408)356-8506 | 10 programmers get it wrong. | 16345 Englewood Ave www.pwpconsult.com |- Jeff Frantz | Los Gatos, CA 95032 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
