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Title: Low power homebrew rig Post by: WA2IXP on November 22, 2012, 09:46:30 PM Have been working on low pwr rig project. Some may recognize the frame used to house it. I have all the panels and covers done however the pictures were from an earlier date. Covers 160-80-40 AM and cw. About 40 watts output. Bands are switched with relays. Started as a simple thing and grew in complexity as most things do. A companion hb reciever sits on top. Vfo and buffer multiplier with 5 miniature tubes followed by a 6146. Mod transformer is from a collins aircraft trans. Have gotten good reports with it on AM. The most difficult thing to get halfway right was the 2" scope. Can view trapizoid or envelope pattern. Have been busy with house and work but hope to finish up and get some use out of it soon.
Jay- Title: Re: Low power homebrew rig Post by: W4EWH on November 22, 2012, 11:15:28 PM Started as a simple thing and grew in complexity as most things do. In the software arena, we call that "Feeping Creaturism"! Bill, W1AC Title: Re: Low power homebrew rig Post by: W7TFO on November 22, 2012, 11:53:45 PM Nice technique, especially the welded framework.
73DG Title: Re: Low power homebrew rig Post by: N0WEK on November 23, 2012, 01:40:09 AM Nice job!
I love the rack/case. A picture of the front would be great. Title: Re: Low power homebrew rig Post by: AJ1G on November 23, 2012, 04:44:14 AM Some may recognize the frame used to house it. BC-375/BC-191 transmitter frame. Title: Re: Low power homebrew rig Post by: N4zed on November 23, 2012, 05:41:39 AM Ya know guys, I've been reading this forum for a few months and looking at some of your "artwork" and knowledge of circuit design makes me feel really ignorant. :-[
I need to start a project...that's the only way to learn...Hell I'm in my middle 50's hope there is still time. Nice work Title: Re: Low power homebrew rig Post by: KL7OF on November 23, 2012, 06:30:31 AM I like it.....Nice work
Title: Re: Low power homebrew rig Post by: W3GMS on November 23, 2012, 07:19:39 AM Have been working on low pwr rig project. Some may recognize the frame used to house it. I have all the panels and covers done however the pictures were from an earlier date. Covers 160-80-40 AM and cw. About 40 watts output. Bands are switched with relays. Started as a simple thing and grew in complexity as most things do. A companion hb reciever sits on top. Vfo and buffer multiplier with 5 miniature tubes followed by a 6146. Mod transformer is from a collins aircraft trans. Have gotten good reports with it on AM. The most difficult thing to get halfway right was the 2" scope. Can view trapizoid or envelope pattern. Have been busy with house and work but hope to finish up and get some use out of it soon. Jay- Fantastic job Jay! Can't wait to work you on the air with it. Beautiful construction job and I am sure it will work as good as it looks. Joe, W3GMS Title: Re: Low power homebrew rig Post by: WA2IXP on November 23, 2012, 07:50:40 AM I can't take any credit for the frame as AJ1G pointed out. Thin steel tube brazed together. I did weld a bracket or two on myself. I'll post some updated pictures soon. Started as a repackage of a 5-10 watt breadboard rig which several of us built years ago. W1VZR, K1JJ, WB2EYE, and others from the "cake pan" days come to mind. Uses a cathode coupled vfo which was extremely stable and keyed well until it was installed and now works like most others without ceramic coil forms and temperature compensation - marginally exceptable. I included an swr bridge and the scope to eliminate some of the clutter if it ever gets to my office desk in the house. A digital vfo kit may take the place of the first two stages if all goes well. Cheap and stable as well as digital readout. Programable offset would work well with my relays and steering diodes. There goes the Feeping creaturism again, Jay-
Title: Re: Low power homebrew rig Post by: Opcom on November 23, 2012, 11:21:39 AM It's well done. I hope we can see the front side at some point with a pattern on the tube.
Title: Re: Low power homebrew rig Post by: WBear2GCR on November 23, 2012, 01:58:40 PM Front view? :D She looks good from the side and walking away... Title: Re: Low power homebrew rig Post by: Opcom on November 24, 2012, 11:53:49 AM Yes, but I'm a handwheel and CRT man..
Title: Re: Low power homebrew rig Post by: WA2IXP on November 24, 2012, 01:57:17 PM Here's a couple of not so good pix's but you can see the whole thing. HB reciever on top. Tried to get scope pix but not too good with camera. Had an enjoyable qso last night on 160 with WB2AHK chet and Vortex Joe N3IBX. Reciever is 160 and 80 with a converter for 40 to 80 mtrs mounted on the end opposite the speaker. Also a 50 watt dummy load behind the speaker operated by toggle switch.
Jay- Title: Re: Low power homebrew rig Post by: WA2IXP on November 24, 2012, 02:03:37 PM Forgot to attach pictures.
Title: Re: Low power homebrew rig Post by: KM1H on November 24, 2012, 04:34:30 PM It looks like a nicely done modern interpetation of a TBS-50D minus a few bands ;)
Carl Title: Re: Low power homebrew rig Post by: N5RLR on November 25, 2012, 12:24:13 AM Ya know guys, I've been reading this forum for a few months and looking at some of your "artwork" and knowledge of circuit design makes me feel really ignorant. :-[ I need to start a project...that's the only way to learn...Hell I'm in my middle 50's hope there is still time. It's never too late to learn. ;) Title: Re: Low power homebrew rig Post by: W1RKW on November 25, 2012, 07:00:42 AM not only is the rig cool, so is your shack.
Title: Re: Low power homebrew rig Post by: W3GMS on November 25, 2012, 11:05:11 AM not only is the rig cool, so is your shack. I certainly agree. What a great mix of gear in your Hamshack! Looks great Jay. Joe, W3GMS Title: Re: Low power homebrew rig Post by: WA1LGQ on November 25, 2012, 03:15:13 PM Wow, that looks great. I was going to say BC-375 too, Chris beat me to it. Thats a real hamshack. I'd like to see the workshop.
Larry Title: Re: Low power homebrew rig Post by: W1RKW on November 27, 2012, 04:27:58 PM Larry, Heard you on the air on Sunday. You sounded pretty good down here on the Yaesu. By the time I got setup and tweaked to go on the air you were gone.
Title: Re: Low power homebrew rig Post by: WA1LGQ on November 29, 2012, 12:21:37 PM Hi Bob, sorry I missed you. I was not around there for too long. Wanted to try some cw on the Yaesu for the first time since I had it. Hopefully we can qso sometime, been spending more time in the shack lately. Maybe even hear this neat IXP rig on the air.
Title: Re: Low power homebrew rig Post by: WU2D on December 01, 2012, 01:11:29 PM It is never too early to get a shock by playing with radios and TVs that you get from your nice uncle who owns a radio shop or from the dump so doing it late in life is a win. You have already beaten the odds and survived to your 50's. So I suggest the aluminum chassis like a Hammond 1444-24 which is 8 x 12" x 3" with a front tacked on approach. Start with someting simple with no more than 4 tubes like a 6AG7 or 6J5 driving a 6L6 final modulated by a 6L6 and 12SL7 speech amp. Something like this Stancor 10P.
Mike WU2D Title: Re: Low power homebrew rig Post by: w1vtp on December 01, 2012, 08:26:13 PM Now THAT is art! :)
Title: Re: Low power homebrew rig Post by: Opcom on December 01, 2012, 11:37:56 PM You have built one of the most interesting looking sets I've seen in a long time! Great on the placement of -everything-!
Title: Re: Low power homebrew rig Post by: Tom WA3KLR on December 02, 2012, 07:52:08 PM Jay,
What a colorful rig! I hope to work you soon on 160 meters. Title: Re: Low power homebrew rig Post by: N0WEK on December 03, 2012, 12:47:46 AM It is never too early to get a shock by playing with radios and TVs that you get from your nice uncle who owns a radio shop or from the dump so doing it late in life is a win. You have already beaten the odds and survived to your 50's. So I suggest the aluminum chassis like a Hammond 1444-24 which is 8 x 12" x 3" with a front tacked on approach. Start with someting simple with no more than 4 tubes like a 6AG7 or 6J5 driving a 6L6 final modulated by a 6L6 and 12SL7 speech amp. Something like this Stancor 10P. Mike WU2D Nice little transmitter, I like how the carbon mic voltage is tapped off the cathode circuit. http://www.k7jrl.com/pub/manuals/stancor/10p/10P%20Instructions.pdf Title: Re: Low power homebrew rig Post by: KB5MD on December 03, 2012, 12:09:25 PM Very nice indeed! AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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