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Title: relay to key apache Post by: NR5P on November 22, 2009, 11:46:34 AM I'm going to install a 4 pin plu for the apache to key it with the d104. Would it be fine to use the heater voltage from the transformer to key a relay for this application?
Title: Re: relay to key apache Post by: Ralph W3GL on November 22, 2009, 12:19:28 PM NO! You DO NOT want AC in that cable! Use a DC relay and convert the filament AC to well filtered DC. Title: Re: relay to key apache Post by: NR5P on November 22, 2009, 12:37:27 PM sorry should have clarified better. I was going to rectify it to dc to prevent any hum from happening. Thats just the only low voltage There is in the transmitter. I'll try to find a relay for that. I've got some 12volt dc relays, I guess I could use a voltage doubler circuit or maybe the 6.3volts would key it.
Title: Re: relay to key apache Post by: WQ9E on November 22, 2009, 12:59:22 PM If you have an old unused wall wart around you can use that for you relay supply voltage. There is plenty of room inside the Apache to hide one under chassis. Any of them rated between 9 to 12 volts should work fine for a 12 volt relay.
Rodger WQ9E Title: Re: relay to key apache Post by: NR5P on November 22, 2009, 01:33:14 PM I went through my junk boxes again and found out that the dc ones are 28v not 12v. I'll just get one from rat shack I guess. I wanted to keep it all american but I guess one chinese relay will be ok
Title: Re: relay to key apache Post by: Pete, WA2CWA on November 22, 2009, 01:34:10 PM Since I had solid-stated all the rectifiers, way back in the "good old days", the 5 volt filament winding was available for use. I built a voltage tripler on a perf board, changed the AC fan in the final compartment to DC, added a DC fan over the modulators, and changed the AC Dow key coil to 12 volts DC (I had one in the junk box). Always disliked having AC wires running all over the innards the transmitter.
Title: Re: relay to key apache Post by: N3DRB The Derb on November 23, 2009, 12:33:07 AM I'm with ralph. I dont want no steekin AC in my mic cord. you could do it, but it opens the door to other bad things that would never happen with dc an are much more likely to happen with ac. Since it's a matter of a few diodes and a filter cap or 2, why invite trouble up in your house?
Title: Re: relay to key apache Post by: N2DTS on November 23, 2009, 08:10:46 PM You can do a full wave bridge off the filiment supply and use a 12 volt automotive relay, they have some that are bulkhead mount (has tab with hole in it). AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
They are good for 30 amps at least. I ran out of 12 volt relays for the 4x813 amp, so tha is what I used. Stacons fit the relay terminals, or auto places sell sockets I think. Some rigs (32V3) use the bias voltage, but its not 12 volts. A dropping resistor might work on a 28 volt relay... Brett |