Re: [Flexradio] Henry 3K Classic & SDR-1000
Brian, How is the diode connected in the iso box? I've made the mistake of putting it across the key line when it really has to be across the coil of the relay to suppress the back EMF of the coil. Even the little 12 volt coils produce a wallop when the circuit is opened. If you have a 10X high impedance probe and a scope you can see the back voltage is a big number without the diode even with small coils. I'm familiar with RF loose in the shack. I burned out the input to my Tek 2712 spectrum analyzer a few years ago. Cost me $2200 to get it fixed as I need it for my broadcast measuring business. Has to have traceable calibration to be legal for the measurements so I had to pay the shot to Tek for the repairs. 73, Larry K2LT Brian Sherrod wrote: > On 5/20/06, Larry Taft <[EMAIL PROTECTED]> wrote: >> Brian, >> >> What is in the isolation box? I'm always looking for ways to do the >> control keying and changeover functions. > > Nothing more than a tiny 12v relay I was keying by grounding from pin > 7 & 15 with diode protection. > > >> As far as repair of the ULN2003A goes, I recommend sending the SDR back >> to Flex as it is all surface mount stuff on the board. They are >> skilled, reasonably priced and fast. Three out of three is good! Just >> had my SDR-1000 in for upgrades and repair. > > Okay Larry, thanks for that info! > > 73 Brian / w5ami > > ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Henry 3K Classic & SDR-1000
On 5/20/06, Larry Taft <[EMAIL PROTECTED]> wrote: > Brian, > > What is in the isolation box? I'm always looking for ways to do the > control keying and changeover functions. Nothing more than a tiny 12v relay I was keying by grounding from pin 7 & 15 with diode protection. > As far as repair of the ULN2003A goes, I recommend sending the SDR back > to Flex as it is all surface mount stuff on the board. They are > skilled, reasonably priced and fast. Three out of three is good! Just > had my SDR-1000 in for upgrades and repair. Okay Larry, thanks for that info! 73 Brian / w5ami ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Henry 3K Classic & SDR-1000
Brian, What is in the isolation box? I'm always looking for ways to do the control keying and changeover functions. As far as repair of the ULN2003A goes, I recommend sending the SDR back to Flex as it is all surface mount stuff on the board. They are skilled, reasonably priced and fast. Three out of three is good! Just had my SDR-1000 in for upgrades and repair. 73, Larry K2LT Brian Sherrod wrote: > Thanks for all the replies on this. Larry, thanks for making the > measurements on yours. That confirms that mine has apparently been > fried, as it measures about 25 ohms keyed or not, and I do have the X2 > sequencing checked in setup. I suspect RF must have gotten into my > isolation box, as I was not connected directly to the Henry key jack > from the SDR. Initially I had a boat load of RF in the shack until I > found the problem. By then it was too late, and it quit keying. ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Henry 3K Classic & SDR-1000
Thanks for all the replies on this. Larry, thanks for making the measurements on yours. That confirms that mine has apparently been fried, as it measures about 25 ohms keyed or not, and I do have the X2 sequencing checked in setup. I suspect RF must have gotten into my isolation box, as I was not connected directly to the Henry key jack from the SDR. Initially I had a boat load of RF in the shack until I found the problem. By then it was too late, and it quit keying. Oh well, in the meantime I will operate with a switch. Anyone know what I need to do to make the repair to the ULN2003A circuit? Thanks again for the help! Brian On 5/19/06, Larry Taft <[EMAIL PROTECTED]> wrote: > Brian, > > I just made some measurements on my SDR-1000 with the power OFF. > X2-pin7, reads infinite resistance using a digital multimeter. In the > Diode test position with plus to pin 7 and minus to ground it shows open > circuit. With the leads reversed minus to pin 7 the reading is 540 > millivolts. This is consistent with the ULN2003A circuit which has a > transistor open collector from pin 7 and the emitter to ground. Also > a diode cathode pin 7 with anode to ground. You should get the same > readings measuring pins 1 through 6 to ground as these are all the same > kind of circuit. > > Unfortunately pins 1 through 6 don't have the external amplifier > sequencing delay so tring to use one of these will result in "hot > switching" the amp relay. For now I'd use a foot switch on the amp to > turn it on just before you PTT the SDR. One man band sort of thing but > it will work as I have done it here with my Drake L-4 before I got the > FET isolated keying module from N0XAS. I put a back diode in my L-4 as > I use it with several other radios. > > I also looked in the manual for my Henry 2K and it shows there is NO > back diode for the changeover relay. There aren't any voltage values > for the relay so I'm guessing its a 24 volt coil that draws 50 mills or > so when operated. Measure the open circuit voltage of the Henry at the > RCA jack and then use the milliamp meter to check the coil current. > When the relay keing circuit is opened to turn the relay off you can get > over 400 volt spike on the control line. This can cause failure of the > X2-7 transistor. > > Haven't run the Henry in years. Its gained way too much weight just > sitting in my office. > > 73, Larry K2LT > > Brian Sherrod wrote: > > I just hooked up my SDR to my Henry 3K Classic. I used pin 7 and pin > > 15 (grnd) on the X2 connector to cause the relay to go to ground, > > however something is wrong. If I use my ohmmeter between 7 and 15 > > without being keyed, I am seeing about 40 ohms, and when I key the > > SDR, it does not change. > > > > I can transmit on the Henry, but the ant relay does not switch back so > > that I can receive without pressing the standby switch on the amp. > > > > The amp only requires grounding the center pin on the rca jack, which > > is what I thought a connection of pin 7 & 15 would do on keyup of the > > SDR. > > > > Any suggestions appreciated. > > > > Brian / w5ami > > ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Henry 3K Classic & SDR-1000
Brian, I just made some measurements on my SDR-1000 with the power OFF. X2-pin7, reads infinite resistance using a digital multimeter. In the Diode test position with plus to pin 7 and minus to ground it shows open circuit. With the leads reversed minus to pin 7 the reading is 540 millivolts. This is consistent with the ULN2003A circuit which has a transistor open collector from pin 7 and the emitter to ground. Also a diode cathode pin 7 with anode to ground. You should get the same readings measuring pins 1 through 6 to ground as these are all the same kind of circuit. Unfortunately pins 1 through 6 don't have the external amplifier sequencing delay so tring to use one of these will result in "hot switching" the amp relay. For now I'd use a foot switch on the amp to turn it on just before you PTT the SDR. One man band sort of thing but it will work as I have done it here with my Drake L-4 before I got the FET isolated keying module from N0XAS. I put a back diode in my L-4 as I use it with several other radios. I also looked in the manual for my Henry 2K and it shows there is NO back diode for the changeover relay. There aren't any voltage values for the relay so I'm guessing its a 24 volt coil that draws 50 mills or so when operated. Measure the open circuit voltage of the Henry at the RCA jack and then use the milliamp meter to check the coil current. When the relay keing circuit is opened to turn the relay off you can get over 400 volt spike on the control line. This can cause failure of the X2-7 transistor. Haven't run the Henry in years. Its gained way too much weight just sitting in my office. 73, Larry K2LT Brian Sherrod wrote: > I just hooked up my SDR to my Henry 3K Classic. I used pin 7 and pin > 15 (grnd) on the X2 connector to cause the relay to go to ground, > however something is wrong. If I use my ohmmeter between 7 and 15 > without being keyed, I am seeing about 40 ohms, and when I key the > SDR, it does not change. > > I can transmit on the Henry, but the ant relay does not switch back so > that I can receive without pressing the standby switch on the amp. > > The amp only requires grounding the center pin on the rca jack, which > is what I thought a connection of pin 7 & 15 would do on keyup of the > SDR. > > Any suggestions appreciated. > > Brian / w5ami > > ___ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ > FlexRadio Homepage: http://www.flex-radio.com > > > ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Henry 3K Classic & SDR-1000
Have you gone into "Setup" and enabled X2? Also I do use an isolation relay to key the amp. This insures protection of the X2 keying circuits. 73 de Joe K1RQG In a message dated 5/19/2006 6:40:50 P.M. Eastern Daylight Time, [EMAIL PROTECTED] writes: I just hooked up my SDR to my Henry 3K Classic. I used pin 7 and pin 15 (grnd) on the X2 connector to cause the relay to go to ground, however something is wrong. If I use my ohmmeter between 7 and 15 without being keyed, I am seeing about 40 ohms, and when I key the SDR, it does not change. I can transmit on the Henry, but the ant relay does not switch back so that I can receive without pressing the standby switch on the amp. The amp only requires grounding the center pin on the rca jack, which is what I thought a connection of pin 7 & 15 would do on keyup of the SDR. Any suggestions appreciated. Brian / w5ami ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com -- next part -- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20060519/a3e2bc39/attachment.html ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
[Flexradio] Henry 3K Classic & SDR-1000
I just hooked up my SDR to my Henry 3K Classic. I used pin 7 and pin 15 (grnd) on the X2 connector to cause the relay to go to ground, however something is wrong. If I use my ohmmeter between 7 and 15 without being keyed, I am seeing about 40 ohms, and when I key the SDR, it does not change. I can transmit on the Henry, but the ant relay does not switch back so that I can receive without pressing the standby switch on the amp. The amp only requires grounding the center pin on the rca jack, which is what I thought a connection of pin 7 & 15 would do on keyup of the SDR. Any suggestions appreciated. Brian / w5ami ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
