Re: [Elecraft] Elecraft: Amplifier for K1
Martin, could you tell me a bit more about how you interfaced the K1 to the TS520? I have an old Atlas 210 I would like to use as a power amp with my K1 as you are using the TS520. I start writing a "how to" question and realize I really don't have all the knowledge to even ask the questions. I guess the best thing I can say is - can anyone help me with this project of using the Atlas 210 as an Amp? What are the steps involved? I know there is more to it than just injecting the K1 signal into the Atlas just past the driver stage. I am not trying to save the Atlas for anything else. 73 de Ken K9FV K1 #1951 - Original Message - From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; Sent: Friday, January 14, 2005 3:13 AM Subject: Re: [Elecraft] Elecraft: Amplifier for K1 Thanks Bob, yes the resistors are metal film or something like that but definitely not wire wound. I spent a fair time on the air last night on 40/80 with the K1 and 100W from the TS520. It works like a charm. The K1 switches the TS520 T/R relays via a little 2 transistor switching circuit (looking at the K1 6R line) which grounds the TS520 PTT line. I built the circuit onto a small piece of vero board which plugs into the 3 pin socket on the filter board (like the official K2 mod) . A screened cable then connects the open collector to the PTT pin on the TS520 Mic socket. I've set the T-R delay to about 500ms so the relays don't switch too much. Do I need to worry about this? If I set it so that it switches say between each word will that wear out the relays too quickly, not sure how robust they are. When operating the K1 barefoot I use a T-R delay of 50ms. Thanks Martin M0KWV [EMAIL PROTECTED] on 13/01/2005 16:58:55 To:[EMAIL PROTECTED] cc: Subject: Re: [Elecraft] Elecraft: Amplifier for K1 Hi Martin, Got that fine. You have got the best of what is possible using the TS520 with the way you have done the mod. Just a point make sure you do not use 2 x100 ohm wire wound resistors for the dummy load. They must be carbon otherwise odd effects can occur due to inductance. You may be well aware of this effect, but I am pointing it out in any case as 2.5W is one of the standard dissapation values for wire wound resistors! Regards, Bob, G3VVT Why not take a look at our Web site? http://www.simoncarves.com * The information in this email and any attachments may contain privileged and/or confidential information intended solely for the use of the individual or entity to whom it is addressed. If the reader of this email is not the intended addressee, or the employee or agent responsible to deliver it to the addressee, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me by telephone or email and delete all copies immediately. * ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Elecraft: Amplifier for K1
Thanks Bob, yes the resistors are metal film or something like that but definitely not wire wound. I spent a fair time on the air last night on 40/80 with the K1 and 100W from the TS520. It works like a charm. The K1 switches the TS520 T/R relays via a little 2 transistor switching circuit (looking at the K1 6R line) which grounds the TS520 PTT line. I built the circuit onto a small piece of vero board which plugs into the 3 pin socket on the filter board (like the official K2 mod) . A screened cable then connects the open collector to the PTT pin on the TS520 Mic socket. I've set the T-R delay to about 500ms so the relays don't switch too much. Do I need to worry about this? If I set it so that it switches say between each word will that wear out the relays too quickly, not sure how robust they are. When operating the K1 barefoot I use a T-R delay of 50ms. Thanks Martin M0KWV [EMAIL PROTECTED] on 13/01/2005 16:58:55 To:[EMAIL PROTECTED] cc: Subject:Re: [Elecraft] Elecraft: Amplifier for K1 Hi Martin, Got that fine. You have got the best of what is possible using the TS520 with the way you have done the mod. Just a point make sure you do not use 2 x100 ohm wire wound resistors for the dummy load. They must be carbon otherwise odd effects can occur due to inductance. You may be well aware of this effect, but I am pointing it out in any case as 2.5W is one of the standard dissapation values for wire wound resistors! Regards, Bob, G3VVT Why not take a look at our Web site? http://www.simoncarves.com * The information in this email and any attachments may contain privileged and/or confidential information intended solely for the use of the individual or entity to whom it is addressed. If the reader of this email is not the intended addressee, or the employee or agent responsible to deliver it to the addressee, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me by telephone or email and delete all copies immediately. * ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
[Elecraft] Elecraft: Amplifier for K1
Hi folks, I have a TS520S. The low level circuitry is faulty but the PA and tank circuits are OK. My main rig is the K1 but it would be nice to be able to run QRO on occasions. So to get QRO on the cheap could I use the PA on the TS520 as an amp for the K1? My antennas are all resonant so matching to the TS520 is no probs. I guess I would loose QSK and would need a relay to bypass the 520 in rx mode. Not sure what sort of signal level would be required at the grid of the 1st 6146. One thought is to operate the K1 into a dummy load with a resistor divider tap off to feed the amp. Don't really want to modify the K1. Also is K1 OK being operated in close proximity to 100W tank circuits. There's plenty of metal around it. This is all off the top of my head and I have no experience of RF power amps. Am I flogging a dead horse here or should I just build a linear? Can't afford a K2 hi. Martin M0KWV K1 #1534 Why not take a look at our Web site? http://www.simoncarves.com * The information in this email and any attachments may contain privileged and/or confidential information intended solely for the use of the individual or entity to whom it is addressed. If the reader of this email is not the intended addressee, or the employee or agent responsible to deliver it to the addressee, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me by telephone or email and delete all copies immediately. * ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
