Subject: GLOWBUGS digest 364

From: [email-masked]
Date: Tue, 26 Nov 1996 10:22:23 -0600 (CST)

GLOWBUGS Digest 364

Topics covered in this issue include:

  1) 811A Hartley
	by [email-masked]
  2) Re: Visio schematics in Word files
	by "R. Eric Sluder" <[email-masked]>
  3) Re: 811A Hartley
	by [email-masked]
  4) Tubes for sale/trade
	by [email-masked] (John Levreault)
  5) Re: Visio schematics in Word files
	by Dan Kerl <[email-masked]>
  6) Re: surplus crystal question
	by Conard Murray <[email-masked]>
  7) Re: Help with PI tank...
	by [email-masked]
  8) Regen Project in Magazine
	by [email-masked] (Joseph Cooper)
  9) HELP HELP HELP
	by Jeffrey Herman <[email-masked]>
 10) Need National NCX-500 schematic
	by "KASTIGAR, MATTHEW (M" <[email-masked]>

----------------------------------------------------------------------

Date: Mon, 25 Nov 1996 12:28:18 -0500
From: [email-masked]
To: [email-masked]
Subject: 811A Hartley
Message-ID: <[email-masked]>

Hi all,
Has anyone tried using an 811A in the basic Hartley circuit?  I got the
impression that it isn't a great choice, however it seems to fire up ok in my
test circuit. I only had about 450V on the plate and was a bit skeptical as
to whether it would percolate at all. It just happened to be the only big
triode I have on hand.

Eric  KA1YRV

------------------------------

Date: Mon, 25 Nov 1996 12:35:23 -0800
From: "R. Eric Sluder" <[email-masked]>
To: [email-masked]
Subject: Re: Visio schematics in Word files
Message-ID: <[email-masked]>

Jeff,

I have a copy of VisioHome also.  That was how I read your schematic for
the 6AG7/6L6 transmitter.  It read your tube symbols and all that
stuff.  So, I'd guess that it should work.  I do remember though, that
it would only read version 3 of your visio techinical file which
(thankfully) you included.

Just some thoughts,

Eric Sluder
KB9BGS
Carmel, IN

> I haven't heard of VisioHome but I assume it's a "defeatured" version of
> Visio.  My guess is that it can take any standard Visio stencil file.  So
> here's what we'll try: I'll make up a file of Visio goodies and post it on
> my FTP site, and then message the list to let you all know it's there.
> 
> Good luck with it and let us know how it works.
> 
> --73--
> 
> --Jeff Duntemann KG7JF
>   Scottsdale, Arizona

------------------------------

Date: Mon, 25 Nov 1996 14:12:36 -0500 (EST)
From: [email-masked]
To: [email-masked]
Cc: [email-masked] (), [email-masked]
Subject: Re: 811A Hartley
Message-ID: <[email-masked]>

> 
> Hi all,
> Has anyone tried using an 811A in the basic Hartley circuit?  I got the
> impression that it isn't a great choice, however it seems to fire up ok in my
> test circuit. I only had about 450V on the plate and was a bit skeptical as
> to whether it would percolate at all. It just happened to be the only big
> triode I have on hand.
> 
> Eric  KA1YRV
> 

I am the one who has not had good luckwith the 811A in triode Hartley
oscillator service.  I would be curious to know the details of your circuit.

1.  coil size, number of turns, and placement of tap.

2.  grid bias capacitor and grid blocking condenser values.

3.  circuit type, HI-C, LO-C (value of lumped tank tuning capacitance).

4.  coupling coil size and inches of coupling.

5.  power input and power output.

6.  relative stability with keying and with key down (short/long term).

Maybe my 811A's are too down to oscillate well.  I only have a pair that
were junkbox pulls, so that could be part of the problem.  My tanks are
very HI-C, and normally have about 8-10 turns on 80M, max.  Every other
tube I have tried, seems to percolate well, but that crazy pair of 811A's
of mine.......hmm......(:+\\.....

I would appreciate any other's Hartley experiences with the 811A, too.

73/ZUT DE NA4G/Bob UP

------------------------------

Date: Mon, 25 Nov 1996 14:24:17 -0500 (EST)
From: [email-masked] (John Levreault)
To: [email-masked]
Subject: Tubes for sale/trade
Message-ID: <[email-masked]>

I bought out a retired ham's stash of RF tubes this weekend. I was "forced"
to take even the stuff I didn't want. I'd like to give youse guys a chance
at these before I go commercial. I have:

-a single Penta 3-500Z, NIB (unopened, dated 1989);
-several 100TH's, test good and look new;
-several 250TH's, test good and look new;
-a bunch of 807's, 6146's, and some metal 6L6's (I have more than I could
ever use);
-lots of rectifiers like 866's, 5Z3's, some 836's;
-lots of other stuff, if you have some "wants".

Anything anyone's interested in?

73 de NB1I
John Levreault
[email-masked]

------------------------------

Date: Mon, 25 Nov 1996 15:00:25 -0600
From: Dan Kerl <[email-masked]>
To: [email-masked]
Subject: Re: Visio schematics in Word files
Message-ID: <[email-masked]>

Jeff Duntemann wrote:
> 
> At 09:14 AM 11/23/96 PST, you wrote:
> >It works beautifully.  How do you get it into Word?
> >How much does Visio cost?
> >Thanks  Gary
> 
> >From Word I selected Insert|Object and then selected the Create from File
> tab, then entered the name of the Visio file.  That's all it takes!
> 
> Visio comes in several different "sizes."  The one I use is Visio Technical
> 4.1, which can be had "on the street" (typical mail order shop) for about
> $279.
<snip>
> 
> BTW, if anyone here ever decides to use Visio, I have a custom stencil of my
> own tube symbols that I will be happy to give anyone.  It contains about
> twice the number of different types as the one Visio created for the 4.1
> release, and I add new ones all the time.  (I just added a 5U4-style
> rectifier symbol, for example.)

I currently use Visio 2.0, which is irritating because the Visio
folks decided to completely forsake backwards compatibility.  I'm 
thinking about the 4.5 upgrade when it's available next year,
since their upgrade pricing is a little more reasonable.  I'd
appreciate a copy of your stencil if it's not too inconvenient.
Will it work with Visio Technical 4.0?

My version of Netscape Navigator (3.0) was able to view your Word
file directly, using Inso's free Netscape plugin. Check out

http://www.inso.com/

for more details. I bet Bill hates these folks...

						Thanks,
						Dan Kerl
						[email-masked]

------------------------------

Date: Mon, 25 Nov 1996 17:17:43 -0600
From: Conard Murray <[email-masked]>
To: Roy Morgan <[email-masked]>
Cc: [email-masked]
Subject: Re: surplus crystal question
Message-ID: <[email-masked]>

Hi Roy,
Here is the scoop on the FT-241 rocks.
This is from the CQ Surplus Conversion Handbook Page 97. It looks like they
lifted the print from somewhere else. 

For units marked for channels 0 thru 79 (20-27.9 MHz):
Fcrystal = Fmarked/54 
for example Channel 0 or 20 MHz is on 370.370 KHz 
            Channel 20 or 22 MHz is on 407.407 KHz
            Channel 46 or 24.6 MHz is on 455.555 KHz 
            Channel 79 or 27.9 MHz is on 516.666 KHz
For units marked for channels 270 through 389 (27-38.9 MHz):
Fcrystal = Fmarked/72
for example Channel 27 is on 375 KHz
            Channel 328 is on 455.555 KHz
            Channel 389 is on 540.288 KHz

These were popular for building homebrew SSB/CW filters. I have used them as
single xtal filters in simple HB receivers.

I hope this helps.
73 de Conard, ws4s  
Conard Murray  WS4S  NNN0UTN   Glowbugs Listowner  
217 Dyer Avenue                BA/GB net 1802.5/3579.5/7050 KHz
Cookeville, Tn  38501          [email-masked]
615-526-4093                   Wise men still seek Him

          - LICENSED ONLY TO EXTENT INDICATED ON CARTON -

------------------------------

Date: Mon, 25 Nov 1996 19:07:39 -0500
From: [email-masked]
To: [email-masked]
Subject: Re: Help with PI tank...
Message-ID: <[email-masked]>

In a message dated 96-11-25 11:32:37 EST, you write:

<< is working fairly well, and seems chirp free in my receiver across the
room.  
 However, I cannot seem to get the PI tank to resonate worth a dang.  I 
 am using a 700pf antenna-side variable, a 300pf plate variable, and a 
 coil of 38 turns #18, 1.25 inches in diameter, airwound stock  >>

Dave a couple of thoughts:

1.  Are you sure that you are getting drive to the 6L6?  Do you have a means
available to measure the grid current, if so how much?  How is the 6L6
biased, are you using the usual grid leak bias?

2.  What is the length of your tank coil? knowing that I can calculate the
inductance to see if it is in the ballpark.  It seems ok as I visualize it,
but there's no substitute for calculation.  

3.  With the loading capacitor (700 pf) fully meshed, you should see a
pronounced dip.  Make sure that the voltage (including filament) to the 6L6
is off and that the tank circuit is not loaded when looking for a dip with
the gd meter.  That should give you a good dip if it is resonant where you
expect.  Try sweeping the grid dip around in frequency in case the dip is
higher or lower than where you expect it.  Make sure you have close coupling
to the between gd and coil.

4.  I assume that you are using the usual shunt fed circuit with an rf choke
and blocking capacitor, make sure they are all good.  Maybe try dipping the
tank with this stuff disconnected from it.

hope you find it.

73 Bob [email-masked]

------------------------------

Date: Mon, 25 Nov 96 23:42 EST
From: [email-masked] (Joseph Cooper)
To: [email-masked]
Subject: Regen Project in Magazine
Message-ID: <[email-masked]>

The current edition of Electronic Handbook (Volume 14) has a very nice bread
board
one-tube (3A4) regen radio. It is primarily for BCB use, but it is a good
starting
point for a simple first project using easy to get parts. You can also use
substitute tubes if needed.

===================================================================
* Joseph Cooper-VE3FMQ  QTH-East York-near Toronto Ontario Canada *
* Interests are:-Lowfer/VLF/BCB Radio-Woodworking-Steam Railroads *
* Blacksmithing-Antique Radios-Crystal Radios-Travel-Burmese Cats *
* Answering Machine(416)423-7333  FAX(416)423-7782 by arrangement *
===================================================================

------------------------------

Date: 	Mon, 25 Nov 1996 20:15:50 -1000
From: Jeffrey Herman <[email-masked]>
To: [email-masked]
Subject: HELP HELP HELP
Message-ID: <96Nov25.201555hwt.188174(2)@uhunix3.its.Hawaii.Edu>

Can any of you folks help the following OM? It would be real nice to
get him back on the air. Please write directly to him at [email-masked].
Jeff KH2PZ

------------------------------Begin Leon's Request------------------------
A am a partially disabled senior citizen.
Looking to get back into ham radio.
Need any old tube type electronic
equip you have for parts to 
build rec. & trans.  Am located in 
Sebring fl. which is near Tampa.
Will come and pu if within driving dist
 or pay shipping.costs.  Call me
collect and we can talk if you can help.
tel 941 471 3739 
email [email-masked]	

------------------------------

Date: 26 Nov 1996 08:27:08 CST
From: "KASTIGAR, MATTHEW (M" <[email-masked]>
To: [email-masked]
Subject: Need National NCX-500 schematic
Message-ID: <[email-masked]>

Microsoft Mail v3.0 IPM.Microsoft Mail.Note
From: KASTIGAR, MATTHEW (MM)
To:  'internet@swgate1'
Subject:  Need National NCX-500 schematic
Date: 1996-11-26 08:29
Priority:
Message ID: 865D7283
Conversation ID: 865D7283

------------------------------------------------------------------------------

internet: [email-masked]

Wanted: Schematic for National NCX-500 xcvr.  Will pay copy cost. THX. Matt,
N0XEU [email-masked]

------------------------------

End of GLOWBUGS Digest 364
**************************