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Another 813 Build




 
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April 04, 2020, 02:13:54 AM *
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N4LTA
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« Reply #200 on: January 06, 2020, 02:06:13 PM »

I agree that he is a FB engineer.  I always go there first. I was going to add that to my transmitter, but I think I'll pass also.

BTW - You were loud and clear last night into SC. I had my 4SQRP Nouveau am rig on and  listening with it  - but a 5 watt reply was not likely to be heard.

Pat
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w9jsw
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« Reply #201 on: March 22, 2020, 06:08:12 PM »

Thundering along like a herd of turtles...  Roll Eyes

I don't know why it has all of those scratches on the inside. Came that way from Hammond. Annoying.


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w8khk
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This ham got his ticket the old fashioned way.


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« Reply #202 on: March 22, 2020, 08:05:32 PM »

Very nice work, John....

Except for a hint of green printed circuit board, and a couple new toroid transformers, it looks retro enough to be a photograph from one of the 50's handbooks.

i like the use of gear and universal drives to make a very functional layout without detracting from optimal control locations on the front panel.  I am especially enamored of using the barrier strips for wires with lugs on the back.  This makes experimentation, customization, and measurements very easy.

Don't worry about the scratches on the underside, it is masked by the fine workmanship and planning you have invested so much time with.  It will be great to see the entire rig in a photo essay real soon!
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Rick / W8KHK  ex WB2HKX, WB4GNR
K1JJ
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"Let's go sailing, Tommy!" - Yaz


« Reply #203 on: March 22, 2020, 09:51:47 PM »

John,

I see you made the front panel layout symmetrical, ala K1KW-style.   That took some planning.

Now keep all the RF connection short and fat - and you've arrived!

T
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Use an "AM Courtesy Filter" to limit transmit audio bandwidth  +-4.5 KHz,  +-6.0 KHz or  +-8.0 KHz when needed. 

"You know my name"  https://youtu.be/noGjJyEDm5s?t=135

There's nothing like an old dog... a puppy... a dog in its prime... or ANY dog!
w9jsw
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« Reply #204 on: March 23, 2020, 07:08:49 AM »

Let's talk about hookup wire.

For the tank, I plan on copper strips from the blocking cap through to the safety choke, then RG213 from there down to the antenna relay. The big tank inductor is already tapped about right with copper strips.

For the input side, RG213 from the connector to the cap that feeds C16. Between c16-L11-c17-c29 use strap, stranded hookup, solid? GA?

For the filaments, using #12 copper. That is the gauge of the wires coming out of the fil trans.

General connections I thought auto hookup wire (I have a bunch) that is an mix of 16 and 14 ga stranded in multiple colors. Any RF reason I should be using solid wire?

Up close on the sockets, most connections will be asap (as short as possible). For ground lugs, will put it directly to chassis.
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n4joy
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« Reply #205 on: March 23, 2020, 10:10:19 AM »

Excellent progress!  I am also building an 813 amp and will hopefully have it up and running this week.  Thanks for sharing the details of your project!

P.S.  The last Hammond chassis I ordered also arrived with deep interior scratches.  No big deal but my OCD side would have preferred their abscence. 
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