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 Post subject: Non-Tube Homebrew
PostPosted: Mar Fri 09, 2012 6:38 pm 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 6011
Location: Santa Rosa, CA
OK... no tubes, but it's all analog... not a single digital function and you need a logging chart to keep track of dial settings.

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This little superhet is built in a Christmas cookie tin and uses the old MK484/ZN414 as the IF amp and detector. Covers 40 M ham and 31 M shortwave. BFO allows good SSB and CW reception.

Rich


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 Post subject: Re: Non-Tube Homebrew
PostPosted: Mar Fri 09, 2012 8:54 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6165
Location: Burbank CA
Let's see under the hood.


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 Post subject: Re: Non-Tube Homebrew
PostPosted: Mar Fri 09, 2012 9:18 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9562
Location: Chesapeake VA
Mike Toon wrote:
Let's see under the hood.


Was thinkin' same, surely has some impressive grille work though...


Tom


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 Post subject: Re: Non-Tube Homebrew
PostPosted: Mar Fri 09, 2012 11:06 pm 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 6011
Location: Santa Rosa, CA
I am still re-assembling the "engine."

Had to take the whole thing apart to do the painting. I sure hope it works after I get all the boards back in. I found it easier to make an RF board and a separate audio board. My audio board is kind of a standard building block that I use with regens and ZN414 radios... just an LM741 driving an LM386. The BFO is a Ten-Tec "kit" board.

Hope to get some pix on the weekend, but have to go to the Silicon Valley ham swap at 5 AM tomorrow. 210 miles round trip but always a lot of fun.

Rich

PS: This was the "Mark I" version. The new set has a different RF board.

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