Re: [Elecraft] Al-572 and KXPA100
I second the request to add TX delay to KX3. Now that delay is < 5 mS. I found that by seeing hot switching with Expert 2k-fa equipped with vacuum relays. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/Al-572-and-KXPA100-tp7585615p7585620.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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] Al-572 and KXPA100
This isn't a problem with the KX3's SWR detection circuitry. If it is detecting a high SWR, it's because the KX3 is producing RF output before the t/r relay has closed and the relay is hot-switching. The SWR detection is doing its job and protecting the KX3 and the amplifier! The solution is either to speed up the amplifier's relay or add some more delay before the start of RF generation after the assertion of PTT by the KX3, as you say. On 3/18/2014 8:14 AM, bruce whitney wrote: Regarding keying another amplifier from the KX3/KXPA100: There is a problem currently being addressed beyond the (electrical specs of current and voltage) capacity of the PTT line to key another amplifier. Currently the KXPA100 cannot be used to key an amplifier with slow frame relay TR switching. The SWR detection cicuitry in the KXPA is too fast to allow the external amp (non-QSK) to go to transmit without tripping out on "ANT FAULT". If you want to drive an amplifier with non-QSK relaying you will have to use manual PTT to key the amplifier to transmsit before giving it any RF power. I understand our Heros at Elecraft are working on incorporating a menu adjustable timing delay to allow VOX keyng without the ANT FAULT problem. Bruce W8RA -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ __ 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
[Elecraft] Al-572 and KXPA100
Regarding keying another amplifier from the KX3/KXPA100: There is a problem currently being addressed beyond the (electrical specs of current and voltage) capacity of the PTT line to key another amplifier. Currently the KXPA100 cannot be used to key an amplifier with slow frame relay TR switching. The SWR detection cicuitry in the KXPA is too fast to allow the external amp (non-QSK) to go to transmit without tripping out on "ANT FAULT". If you want to drive an amplifier with non-QSK relaying you will have to use manual PTT to key the amplifier to transmsit before giving it any RF power. I understand our Heros at Elecraft are working on incorporating a menu adjustable timing delay to allow VOX keyng without the ANT FAULT problem. Bruce W8RA __ 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
[Elecraft] Al-572 and KXPA100
Hi, Does any have advice or experience driving an Ameritron AL-572 with as KX3/KXPA100? The KXPA100 manual reports that the keyline for KXPA1000 serial numbers 700 and up are protected to 30v at 100ma. The AL572 keys at 12v at 100ma, so should be good there. 73 Ron AF1Q __ 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
