[Elecraft] XV-144 Overdrive protection
Hello Just starting Part VI-Filter Alignment, other tests prior worked no problem. Using a KX3 on 5 watts with XV-144 set to 5 watts input. With key line and coax from ant socket (kx3) to XV-144. Dummy load via power meter connected to output of XV-144. The XV-144 goes into overdrive protection whatever power I apply to the input all I get is the power led's flashing on the front panel. Any ideas where to look, am I missing something? Thanks Andrew GM0UDL -- View this message in context: http://elecraft.365791.n2.nabble.com/XV-144-Overdrive-protection-tp7584207.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] XV-144 Overdrive protection
Andrew, Some transverters suffer from false overload detection due to noise on the DC circuit to the microprocessor. The cure I have found effective is to remove the front panel metalwork and solder a 0.1 uF capacitor between the collector and emitter of Q7. If you do not have the two 0.1 uF capacitors on the 5 volt regulator and the 10 uF electrolytic across the 5 volt line (between pins 1 and 2 of the main board P1) they should be added as well. See http://www.elecraft.com/Apps/XV_Bypassing_Cap_Builder%27s_Alert_Rev_A.pdf 73, Don W3FPR On 2/13/2014 5:09 PM, Andrew wrote: Hello Just starting Part VI-Filter Alignment, other tests prior worked no problem. Using a KX3 on 5 watts with XV-144 set to 5 watts input. With key line and coax from ant socket (kx3) to XV-144. Dummy load via power meter connected to output of XV-144. The XV-144 goes into overdrive protection whatever power I apply to the input all I get is the power led's flashing on the front panel. Any ideas where to look, am I missing something? __ 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] XV-144 Overdrive protection
Don, Thanks for the reply. I have the capacitors on the reg and the electrolytic cap on pin 1 and 2. I am using a separate supply on the XV-144 compared to the KX3, will try using the 1 supply. Then I will fit a 0.1 uf on Q7. Thanks Andrew GM0UDL -- View this message in context: http://elecraft.365791.n2.nabble.com/XV-144-Overdrive-protection-tp7584207p7584210.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] XV-144 Overdrive protection
I have seen this before when the 2.5mm key line jack just needed pushed home. Rx without the key line causes the front LEDs to flash. -- View this message in context: http://elecraft.365791.n2.nabble.com/XV-144-Overdrive-protection-tp7584207p7584272.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] XV-144 Overdrive protection
GM0LEP, Thanks for that I have run out of time as I am due to go away to work for 6 weeks or so. I will check that the PTT line is working and may try another radio as a driver also. Will keep all posted later on here. thanks Andrew GM0UDL -- View this message in context: http://elecraft.365791.n2.nabble.com/XV-144-Overdrive-protection-tp7584207p7584309.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
