[drakelist] L4B voltage board

[el34guy]

Does anyone know if the boards are still available for the L4B from the Heathkit guy? Anyone have an extra for sale if they arent available anymore? Thanks
 
Mark
W0NCL

Re: [drakelist] L4B voltage board

[Mark Gilger]

The best thing to do is contact him. He has just he boards
or a full kit for $100.  
http://www.theheathkitshop.com/index.html
Mark
At 02:51 PM 4/03/06, [EMAIL PROTECTED] wrote:
Does anyone know if the boards are
still available for the L4B from the Heathkit guy? Anyone have an extra
for sale if they arent available anymore? Thanks
 
Mark
W0NCL

[drakelist] 2B part question

[Ken Kaplan]

Ken Kaplan <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
I need some assistance in identifying a disc capacitor on my 2B.

Mounted on the passband selector switch, is a small disc capacitor,
connected to the two end connections on the terminal board. It has some 
violet (paint) marking on it.


The schematic I have is very 'blurry' at the point I need to see.

I'll do a digital pix, if no-one can identify it.

thanks
73
Ken WB2ART
Sayville, NY
www.wb2art.com
www.unpcbs.com

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Re: [drakelist] 2B part question

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Ken -

The disc ceramic caps with paint on them are selected caps, typically 
1-2%.   I don't think I've ever seen one of those go bad.   Are you 
certain that is your problem??


The 2-B schematic doesn't have any component values for the PB tuner, 
which is what all those caps are.   The 2-A schematic has values, and I 
have a schematic of the R-4B PB tuner on my CD.   All the PB tuners are 
the same, essentially, from the 2-A to the 4-B, just added selectivity 
positions from 2 in the "A", 3 in the "B" and 4 in the "R-4/A/B"


Can you ID the capacitor you suspect on the 2-B schematic, even if you 
can't read the value?   My 2-A and 2-B schematics are clear, but there 
are no values on the 2-B version.  The 'purple' caps on the R-4B PB 
tuner board are the coupling capacitors on either side of the center PB 
tuner section.


73, Garey - K4OAH
Atlanta

Drake B & C-Line Service CDs




Ken Kaplan wrote:


Ken Kaplan <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
I need some assistance in identifying a disc capacitor on my 2B.

Mounted on the passband selector switch, is a small disc capacitor,
connected to the two end connections on the terminal board. It has 
some violet (paint) marking on it.


The schematic I have is very 'blurry' at the point I need to see.

I'll do a digital pix, if no-one can identify it.

thanks
73
Ken WB2ART
Sayville, NY
www.wb2art.com
www.unpcbs.com


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Re: [drakelist] 2B part question

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Ken -

Just remembered I have a 2-B open on the bench.   I assume you mean the 
cap that is stretched across the "top" (bottom?) edge of the board.  
That is the coupling capacitor between the two middle inductors, C34 on 
the 2-A schematic.  In the 2-A it's 27 pF, and in the R-4 series the 
same cap is 5 pF.   The difference in value is because the coupling 
capacitor is varied by the bandwidth switching system.   Without 
analyzing the filter in the 2-A and trying to extrapolate the values to 
a 3 b/w filter, I'd start with something around 15-20 pF and  see if the 
filter has a reasonable passband shape.   The filters were swept at 
Drake and that cap and the two on either side were picked as a part of 
that alignment.


All that aside, it's probably going to take some fiddling to get the 
right value.   You might take a look at the Elecraft website and 
"borrow" their filter alignment method.   Basically it feeds a broadband 
noise source into the front end of the receiver and looks at the audio 
output spectrum with a computer sound card using a software package 
called Spectrogram.  Spectrogram is a shareware product and I think 
there is a link on the Elecraft site to download it.


Let me know how you make out

73, Garey - K4OAH
Atlanta

Drake B & C-Line Service CDs




Ken Kaplan wrote:


Ken Kaplan <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
I need some assistance in identifying a disc capacitor on my 2B.

Mounted on the passband selector switch, is a small disc capacitor,
connected to the two end connections on the terminal board. It has 
some violet (paint) marking on it.


The schematic I have is very 'blurry' at the point I need to see.

I'll do a digital pix, if no-one can identify it.

thanks
73
Ken WB2ART
Sayville, NY
www.wb2art.com
www.unpcbs.com

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Re: [drakelist] 2B part question

[Ken Kaplan]

Ken Kaplan <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Thanks Garey.

The cap is actually broken. There is a large chip of the material off 
it, and you can see the inner 'metal'.


I guess, I may be able to measure the value, if I can seal the
material, but I won't put it back into the 2B.

I only have the schematic from BAMA. Guess I better find a good manual

I have 2 Elecraft K2's, #769 and #5048, and the noise generator.
That's a very good idea to use their method, would never have thought of it.

I'm currently pairing the 2B with an Eico 723, which is getting a 
complete rebuild, including re-copper plating te chassis.

I wish I could do that with the 2B!!!

Thanks again for the info.

73
Ken WB2ART
Sayville, NY
www.wb2art.com
www.unpcbs.com




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