[Elecraft] K3 with a Kenwood TL-922A

2011-09-02 Thread Chris Hembree
I am buying a Kenwood TL-922A Amp. Anything I need to know before I hook the K3 up to it. Thanks Chris W7CTH __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mai

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-02 Thread Joe Subich, W4TV
> Anything I need to know before I hook the K3 up to it. Don't do it! The TL-922 has a high voltage PTT line with *no* current limiting and no reverse EMF diode across the relay coils. The relay current is rather high and the "spike" when releasing PTT is quite high. You will need to add a H

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-02 Thread Paul Christensen
PM Subject: Re: [Elecraft] K3 with a Kenwood TL-922A > > > > Anything I need to know before I hook the K3 up to it. > > Don't do it! The TL-922 has a high voltage PTT line with *no* current > limiting and no reverse EMF diode across the relay coils. The relay > c

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-03 Thread Vic K2VCO
t; - Original Message ----- > From: "Joe Subich, W4TV" > To: > Sent: Friday, September 02, 2011 9:38 PM > Subject: Re: [Elecraft] K3 with a Kenwood TL-922A > > >> >> >>> Anything I need to know before I hook the K3 up to it. >> >> Don'

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-03 Thread Fred Townsend
Please see comments below. -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Vic K2VCO Sent: Saturday, September 03, 2011 11:51 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 with a Kenwood TL-922A Actually, I

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-03 Thread Joe Subich, W4TV
; -Original Message- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Vic K2VCO > Sent: Saturday, September 03, 2011 11:51 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3 with a Kenwood TL-922A > > Actually, I bel

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-03 Thread Vic K2VCO
gt; Sent: Saturday, September 03, 2011 11:51 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3 with a Kenwood TL-922A > > Actually, I believe that the K3's amp keying output could handle the +120v > key line of the > 922 with no trouble. My TL922 came with a diode ac

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-03 Thread Fred Townsend
AE6QL -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, W4TV Sent: Saturday, September 03, 2011 1:18 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 with a Kenwood TL-922A > Vic: Do you real

Re: [Elecraft] K3 with a Kenwood TL-922A

2011-09-03 Thread Paul Christensen
> In my opinion, the TL922 MUST be modified with a faster relay, or you must > use PTT, or you > must use a large-ish amount of TX Delay to prevent hot-switching. Another option to deal with sluggish amp T/R relays involves use of an external T/R switch like the Ameritron QSK-5, or Array Solutio