Re: [Elecraft] KAT500 Schematic?
On Mon, Jun 3, 2013 at 11:06 AM, Jim Miller j...@jtmiller.com wrote: Is there a KAT500 schematic posted anywhere? I'm interested in the connections on the KAT500 AUX connector which goes to the KAT500. Don't know about schematics, but the pinout for the DB15 Interface Cable is on page 9 of the manual (Interface Cable Wiring section). 73, ~iain / N6ML __ 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
Re: [Elecraft] [KAT500]schematic
Hi, How did you measure that? They are very different from my measurements. Here is what I did: Put radio TX in Test mode to protect the XG3. Connect XG3 to antenna 1 at -74dBm on 10m. Measure: port 1: -76dBm port 2: -107dBm (port connected to another antenna switch which presents a short circuit). port 3: -110dBm (port connected to dummy load from Ridge Electronics). The measurements are taken with LP-Pan/NaP3. That's a mere 34dB in the best case. BTW the numbers confirm what I can easily observe during normal operation. What are other people seeing? AB2TC - Knut Phil amp; Debbie Salas wrote “...I have noticed that the port-to-port isolation between the 3 antenna ports is rather poor...” I measured about 42dB isolation on 6M from port 1-2. And this stays pretty constant down to 15M and then gets better fast. I measured about 61dB isolation on 6M from port 1-3. This gets better very fast, going to 75dB on 10M. I use ports 1 and 3 for my two HF antennas (43ft vertical and 20/15/10M rotatable dipole), and put my 6M beam on port 2. Phil – AD5X snip -- View this message in context: http://elecraft.365791.n2.nabble.com/KAT500-schematic-tp7568007p7568054.html Sent from the Elecraft mailing list archive at Nabble.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
Re: [Elecraft] [KAT500]schematic
Knut, FWIW I found that the isolation between the ANT 1 and 2 ports of my KAT100 on 15m was only approx 40db. To increase the isolation between ports, not only did I have to add a relay to ground the port not in use, but I also had to replace the relay-to-port unshielded wiring with coax. Sounds as though you could have a similar problem with the KAT500. 73, Geoff LX2AO On January 01, 2013 at 6:53 PM, Knut AB2TC wrote: Hi, How did you measure that? They are very different from my measurements. Here is what I did: Put radio TX in Test mode to protect the XG3. Connect XG3 to antenna 1 at -74dBm on 10m. Measure: port 1: -76dBm port 2: -107dBm (port connected to another antenna switch which presents a short circuit). port 3: -110dBm (port connected to dummy load from Ridge Electronics). The measurements are taken with LP-Pan/NaP3. That's a mere 34dB in the best case. BTW the numbers confirm what I can easily observe during normal operation. What are other people seeing? AB2TC - Knut __ 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
Re: [Elecraft] [KAT500]schematic
“...How did you measure that? They are very different from my measurements. ..” I measured the isolation with my Array Solutions VNA2180. Phil – AD5X __ 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
Re: [Elecraft] [KAT500]schematic
Hi, Ah, so you measured loss directly from, say, port 1 to port 2 with a VNA (vector network analyzer). Those will be different numbers and not what I had in mind. What I am interested in is how much an unwanted signal on one antenna port is attenuated when another antenna port is selected. Or vice versa, when transmitting, how much power goes out the two ports not selected. This loss could be improved significantly if the unselected ports could be grounded, which is why I am interested in a schematic. AB2TC - Knut PS. We now have about 19F and my remote KAT500 is showing no signs of distress. Phil amp; Debbie Salas wrote “...How did you measure that? They are very different from my measurements. ..” I measured the isolation with my Array Solutions VNA2180. Phil – AD5X snip -- View this message in context: http://elecraft.365791.n2.nabble.com/KAT500-schematic-tp7568007p7568059.html Sent from the Elecraft mailing list archive at Nabble.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
Re: [Elecraft] [KAT500]schematic
..Ah, so you measured loss directly from, say, port 1 to port 2 with a VNA (vector network analyzer) I should have been clearer. I connected the VNA output to Port2, the VNA input to the radio port, and I selected Port 1. So isolation measured was Port2 to common when Port1 was selected. Then I did the same measurment, but connected the VNA output to Port3, and the VNA input to the common with Port1 selected so I could see isolationf from Port3 to common with Port1 selected. Email me and I can provide those scans if you'd like. Phil - AD5X __ 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
Re: [Elecraft] [KAT500]schematic
Hello again, Hmm, that should produce similar results to mine. One possibly important difference is that the VNA ports are perfectly matched 50ohm ports, but that shouldn't make that much of a difference. Have you ever tried to connect a dummy load to one of the ports (leaving the KAT500 in the normal shack wiring otherwise), select it and see how much stuff leaks through from the other two ports? I will send you an E-mail so you get my E-mail address. But I don't doubt your interpretation of the scans. AB2TC - Knut Phil amp; Debbie Salas wrote ..Ah, so you measured loss directly from, say, port 1 to port 2 with a VNA (vector network analyzer) I should have been clearer. I connected the VNA output to Port2, the VNA input to the radio port, and I selected Port 1. So isolation measured was Port2 to common when Port1 was selected. Then I did the same measurment, but connected the VNA output to Port3, and the VNA input to the common with Port1 selected so I could see isolationf from Port3 to common with Port1 selected. Email me and I can provide those scans if you'd like. Phil - AD5X snip -- View this message in context: http://elecraft.365791.n2.nabble.com/KAT500-schematic-tp7568007p7568063.html Sent from the Elecraft mailing list archive at Nabble.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
Re: [Elecraft] [KAT500]schematic
“...I have noticed that the port-to-port isolation between the 3 antenna ports is rather poor...” I measured about 42dB isolation on 6M from port 1-2. And this stays pretty constant down to 15M and then gets better fast. I measured about 61dB isolation on 6M from port 1-3. This gets better very fast, going to 75dB on 10M. I use ports 1 and 3 for my two HF antennas (43ft vertical and 20/15/10M rotatable dipole), and put my 6M beam on port 2. Phil – AD5X __ 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
