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 Post subject: Lindsay's TRF Regenerative Receiver
PostPosted: Sep Wed 10, 2008 1:25 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 620
Location: Lyons, Kansas
I've built three regenerative receivers, not counting my version of Dave Schmarder's signal generator regen. I'm beginning my fourth receiver and it will be the most challanging for me. http://i30.photobucket.com/albums/c324/ ... fregen.jpg

It is a four tube (2 6C5's and 2 6SK7's) TRF regenerative receiver by Lindsay Publications. Has anyone here built one of these?

The picture is the parts that I have accumulated for the project. They are lying on a steel sheet that I'll cut for the chassis. The steel came from a Phone Card Machine that I used to sell phone cards from until I couldn't keep up with the new $$ bills that kept coming out. I found a better use for it anyway. :D

As I build it, I'll post my progress. The first step is cutting out the chassis and painting it - Black.

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 Post subject:
PostPosted: Sep Wed 10, 2008 6:34 pm 
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Joined: Aug Wed 30, 2006 4:46 pm
Posts: 288
Location: Milwaukee, WI
mradiolab,

I haven't built Linday's TRF, but I've built his superhet ..

It's at:

http://bignick.net/Morgan_Radio/Radio_19.htm

And it looks like this ..

Image

--Big Nick


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 Post subject:
PostPosted: Sep Wed 10, 2008 7:49 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 620
Location: Lyons, Kansas
That's nice, Nick. If my TRF is a success I might try one, but coils are my downfall right now. How is it's performance?

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 Post subject:
PostPosted: Sep Thu 11, 2008 7:22 pm 
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Joined: Aug Wed 30, 2006 4:46 pm
Posts: 288
Location: Milwaukee, WI
mradiolab,

I'm always surprised at the performance of these home-brewed
superhets with home made I.F. transformers.

It's not as if it had an umpteen pole digital filter, and a digital
synthesis tuner, but it is completely usable and satisfactory.

I was able to listen to 80m SSB transmissions with no problem.

I really don't have the equipment to quantify its performance
data-wise.

Another aspect of utilizing equipment such as this design, is
that the more familiar you become with operating it and the better
knowledge that one gains as to what you're specifically trying to
receive, the better the performance that you can achieve ..

I hope that makes sense? :D

--Big Nick KC9KEP


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 Post subject:
PostPosted: Sep Thu 11, 2008 8:46 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 620
Location: Lyons, Kansas
Sure, that makes sense. I notice the same thing with my home brews. The more you work with a set the more you are able to recognize a signal and bring it in. As to bands, I'm just concentrating on the broadcast band first. When I can wind that coil I'll move on, instead of the hit-and-miss coils I've wound so far.

I've almost got my chassis cut out - by hand with a hacksaw. Next, I think I will cut out the tube socket holes with my greenlee punch and drill holes for the dials before I bend the sheet into a chassis.

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 Post subject:
PostPosted: Sep Wed 24, 2008 2:57 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 620
Location: Lyons, Kansas
Well, this thing is taking shape. I've never used greenlee punches before. My punches came from the young, silent key KE0GN, that gsparks and I often mention here. He would have definately have been a member, had he survived.

The size of punch to use for octal tubes is 1 1/8", if any one is contemplating getting some. Image They are easy to use. The plug cuts easily and drops right out of the hole.

Image

Image

Image

Bending sheet metal is something new for me also. I think my ball-peen hammer will help correct my mistakes.

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 Post subject:
PostPosted: Sep Wed 24, 2008 4:30 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 504
Location: Kalamazoo, MI USA
Steve,

Keep us posted on this one. It would be nice to hear how it comes out.

I was hoping to build Lindsay's TRF once I finished my Hiker's, which I just did. I'll order the book this week and get the schematic.

"Rob"


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 Post subject:
PostPosted: Dec Thu 04, 2008 5:07 am 
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Joined: Jun Fri 27, 2008 3:10 am
Posts: 97
Location: Killingworth Connecticut 06419
I have restored several AK 55s and have two semi parts units.
Really don't need another AK55 but I have considered removing some turns from the coils and turning it into a 160 mtr TRF.

Rather then the $$$$ 45 PP audio I am thinking of going to a 6L6 SE adding a 6 v filiment xfrmr.

Its on the "to do" list which could mean years.

73

Carl
WA1KPD


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