I think the Hamgadgets Universal Keying adapter provides the isolation we're looking for. I will ask. I think the small kits, that go together in about 25 minutes are about $16.
Greg AB7R -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of ecellison Sent: Sunday, November 20, 2005 6:17 AM To: 'Larry Loen'; 'Wallace Watson' Cc: FlexRadio@flex-radio.biz Subject: Re: [Flexradio] RFC - Poor Man's Universal Controller Board Wally Thanks for the input, and I would definitely like to persue this as a project. Iffn you got a pencil, how about a sketch or something since you have already jumped on it and have the parts details. A kit should be pretty simple to do. How are you at ExpressPCB? Larry, sorry we don't have something for you at the moment! They do make 5 volt relays I saw them from DigiKey. Onea dem and a diode should get you in business. Eric2 -----Original Message----- From: Larry Loen [mailto:[EMAIL PROTECTED] Sent: Sunday, November 20, 2005 4:12 AM To: Wallace Watson Cc: ecellison; FlexRadio@flex-radio.biz Subject: Re: [Flexradio] RFC - Poor Man's Universal Controller Board Wallace Watson wrote: >All, >I used Dale, N0XAS's, Univeral Keying Adapter for my Amp keying scheme. >This little board uses an optically isolated,MOSFET solid-state relay part ># G2-1A03 as the interface to the amplifier with the following specs; >1) Keys solid state, grid block or cathode keyed amplifiers or transmitters >up to 400V AC or DC >2) Optical isolation between rig and key input >3) Self contained and low voltage power requirement >4) Compact size ideal for integration into other equipment > >For our proposed use, the only other component required, besides the >optically isolated MOSFET chip, is a current limiting resistor in the range >of 270 - 500 ohms for use with the 5V DC power source available from the >SDR radio's X-2 connector pin 14. The optically isolated MOSFET chips >input is driven directly from X-2 pin 7. > >If we wished, we could include on the Poor Man's Universal controller board >(PMUCB) a group of these same optically isolated MOSFET chips for >protecting X-2 control lines, pins 1-6. If the isolators are not required >we could have pads or headers to bypass the optically isolated MOSFET chips >and terminate at a 6 or 10 pin Berg connector as suggested by Eric2. > >It would be my desire to utilize 1/8" phone jacks mounted on the PMUCB for >a foot switch or hand switch for keying the SDR via X-2 pin10 PTT input. > >I would like to thank Eric2 for making this proposal on the email >reflector. We had discussed this subject prior to the Belize DXpedition >trip on Teamspeak, and unfortunately he suffered an SDR radio component >failure as a result of trying to connect a relay in an amplifier directly >into the radio on x2-7 without any buffering. > >I believe now is the time for this supplemental SDR radio interface >kit. We are all pleased with the Delta-44 breakout box replacement that >Tony designed and had circuit boards manufactured for. And for which Eric2 >purchased all of the components and dry assembled the entire kit to make >available to all of us SDR-1000 radio owners. I don't know if it was ever >verbalized by the SDR Radio owners community but I wish to thank Eric2 and >Tony for a job extremely well done! > >Thanks, Wally - M0ZAZ. > >At 05:55 AM 11/20/2005 -0500, you wrote: > > I have this problem in real-time. I am, right now, trying to work out the details of keying a Harris Miltary Surplus Amplfier. It is a very interesting device, having apparently been used all over the government (military, especially) over the last 20 or 30 years. Not least of the problems is figuring out how to safely hook up a rig like the SDR 1000 to it. I'm going to have to do what I'm least good at -- a little homebrewing -- at the moment it would be most dangerous to our favorite transmitter. And, of course, I'd like to get it done before CQ WW this next weekend, so I don't have forever, at least not if I want the amp for the contest. The more obvious schemes, using readily available parts, would involve using twelve volts to trigger 110v AC relays. At least, the T/R HF switch I currently have is triggered off of 110, but obviously, I don't want to switch that directly. The most readily available scheme would be a 12v triggered AC relay which would then be hooked to the T/R antenna switch, itself switched off of 110v. But, ultimately, if I want to trigger this from the SDR itself, I'm going to need optical isolation or open collectors or something so I can translate the available voltages off the back of the SDR to the 12v that my current scheme, at least, will need. Maybe there are 5v triggered relays out there, but this is what I have for now. I'm going to get a hand from Terry, W0VB, who really understands this stuff 100 fold better than I do. But, at least at the present, this is what I'm expecting to do. A supplemental SDR interface board that made it easy to do these sorts of things, especially if it protected the rig against most errors and stupidity, would be a real boon to me, right now, today. Larry WO0Z _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
