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Title: Adding changeover relay to HT-44 Post by: N4RMT on September 08, 2015, 09:28:57 AM Hey guys. Long time lurker, first time poster. Got my first tube type transmitter the other day. Hallicrafters HT-44 with matching PS-150. I'm installing a DPDT antenna changeover relay per the manual, but A couple of things have me stumped. First, in the parts list, it tells me I need a cinch-jones type 81A plug. Well, that's on the power cable. Why do I need another? Also, where it shows in the layout pins 2 and 3 of the control socket, it shows pin 3 connected to a ground tab. Is that something I need to do, or does that part already exist? I'm assuming I need to do it because currently, pin 3 is not grounded according to my Fluke. If I'm to do it, do I just lift the other end of the current connection and ground it, or add a ground to it as it is now? Also, while I'm here, anybody got an old style panel mount RCA jack with the rivet /screw ears?
Thanks guys Randy Title: Re: Adding changeover relay to HT-44 Post by: Pete, WA2CWA on September 08, 2015, 01:07:06 PM Hey guys. Long time lurker, first time poster. Got my first tube type transmitter the other day. Hallicrafters HT-44 with matching PS-150. I'm installing a DPDT antenna changeover relay per the manual, but A couple of things have me stumped. First, in the parts list, it tells me I need a cinch-jones type 81A plug. Well, that's on the power cable. Why do I need another? Also, where it shows in the layout pins 2 and 3 of the control socket, it shows pin 3 connected to a ground tab. Is that something I need to do, or does that part already exist? I'm assuming I need to do it because currently, pin 3 is not grounded according to my Fluke. If I'm to do it, do I just lift the other end of the current connection and ground it, or add a ground to it as it is now? Also, while I'm here, anybody got an old style panel mount RCA jack with the rivet /screw ears? Thanks guys Randy No clue what a 81A plug is. Out of the box HT-44, pins 2, 3, and 4 on the Control socket are connected to the make/break terminals of an internal relay. Wire it as shown to pins 2 and 3. When you key the transmitter, the internal relay closes grounding pin 2 completing the circuit for power to activate your new antenna relay. The HT-44 out of the box used the phono jack (labeled antenna) for RF output. They also provided a punched hole for a standard UHF connector (SO-239). If you don't have the SO-239 installed, I would install one in the hole provided. Move the wire connected to the phono jack (labeled antenna) and connect it to the SO-239 (now the new antenna connection). Now you have a free phono jack to connect the wire coming from the new internal antenna relay to your receiver. Title: Re: Adding changeover relay to HT-44 Post by: N4RMT on September 08, 2015, 01:38:31 PM Boy do I feel dumb on the RCA jack deal... I installed an SO-239, but wired it in parallel to the RCA jack... Geez... So that's handled. Thanks. So to wire in the relay, I don't need to make any changes to the stock wiring of the control socket? Just connect pin 2 to the relay coil? Or add that ground straight from pin 3 that is shown?
Randy Title: Re: Adding changeover relay to HT-44 Post by: Pete, WA2CWA on September 08, 2015, 03:06:09 PM So to wire in the relay, I don't need to make any changes to the stock wiring of the control socket? Just connect pin 2 to the relay coil? Or add that ground straight from pin 3 that is shown? Randy NOT "OR" ----"AND" Title: Re: Adding changeover relay to HT-44 Post by: N4RMT on September 08, 2015, 03:27:21 PM OK. Thanks Pete. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Randy |