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1994-11-13
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Date: Tue, 12 Jul 94 04:30:30 PDT
From: Ham-Homebrew Mailing List and Newsgroup <ham-homebrew@ucsd.edu>
Errors-To: Ham-Homebrew-Errors@UCSD.Edu
Reply-To: Ham-Homebrew@UCSD.Edu
Precedence: Bulk
Subject: Ham-Homebrew Digest V94 #191
To: Ham-Homebrew
Ham-Homebrew Digest Tue, 12 Jul 94 Volume 94 : Issue 191
Today's Topics:
Air system sockets better?
CW Timings
FSK VCXO Circuits
International Instruments/Sigma instruments
Old Parts
PMP
Poor Man's Packet?
QST DDS article
RDF kit order lost
RF & IF tank alignment hints
RSGB BOOK (2 msgs)
Single 813 amp?
SUMMARY DSP algorithms
Wanted: Popular Electronics article from May 94 issue
Send Replies or notes for publication to: <Ham-Homebrew@UCSD.Edu>
Send subscription requests to: <Ham-Homebrew-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Homebrew Digest are available
(by FTP only) from UCSD.Edu in directory "mailarchives/ham-homebrew".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
----------------------------------------------------------------------
Date: 11 Jul 94 18:57:07 GMT
From: news-mail-gateway@ucsd.edu
Subject: Air system sockets better?
To: ham-homebrew@ucsd.edu
Anyone out there have any experience with air system sockets for the
3-500 or 4-400 line of tubes?
I am considering replacing the ceramic sockets in my homebrew amp,
with air system type sockets. The reason being that I find the noise
generated by the air passing thru the pressurized chassis, thru those
tiny holes in the cermic sockets, and out thru the tube base to be
too loud. I've mounted a squirrel cage blower in the adjoing room
and pipe the air in via large 4" hose. The blower is rated at
95 cfm @ 0" / 70 cfm @ 2" H2O. I have a variac on the blower and have
two settings, one for casual use and another for full-tilt contesting.
But, even at the lower voltage setting I find the noise objectionable.
I think the air system type of socket would present less resistance to
the air yielding lower back pressure. Hence, I could move more air with
less pressure. BUT, I don't know this for certain, and was hoping someone
reading this forum could give me another oppinion before I perform surgery
on the amp.
Thanx & 73 de Walt - K2WK waltk@pica.army.mil
------------------------------
Date: 11 Jul 94 13:42:22 GMT
From: news-mail-gateway@ucsd.edu
Subject: CW Timings
To: ham-homebrew@ucsd.edu
Thanks to all who responded to my posting...
73, Marco
--
Marco Fassiotto, i1iiy/aa1iu
Internet : fax@sparc4.ico.olivetti.com
AX25 : aa1iu@n0ary.#nocal.ca.usa.na
------------------------------
Date: Mon, 11 Jul 1994 17:13:03 GMT
From: psinntp!cooper!mark@uunet.uu.net
Subject: FSK VCXO Circuits
To: ham-homebrew@ucsd.edu
Hello all,
Could someone steer me in the direction of where I can find a voltage
controlled oscillator circuit that would be suitable for, say, a 16
step FSK input? My desire is to transmit 4 bit bauds via FSK, hopefully
over only 1-2KHz bandwidth in the 27MHz region. Thanks!
BTW, does the ARRL have a WWW server?
Mark
; Mark Balch The Future is MPP!
; The Cooper Union mark@alf.cooper.edu [slow but reliable]
; (212) 353-4350 mark@magnum.cooper.edu [fast but chancy]
------------------------------
Date: 11 Jul 1994 16:31:02 GMT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!gatech!newsxfer.itd.umich.edu!zip.eecs.umich.edu!umn.edu!newsdist.tc.umn.edu!dawn.mmm.com!tcdsp1!tahir@network.ucsd.edu
Subject: International Instruments/Sigma instruments
To: ham-homebrew@ucsd.edu
Let me see if I can explain this:
I am looking for a triple purpose panel meter made by International instruments a
division of sigma instruments inc. The meter shows tuning on the left side
battery strength in the middle and output on the right. It is about 3 1/2" X
2 1/2". The box says Range 001 MA Model 1122HL. The company used to be at
88 Marsh Hill Road, Orange, Conn.
Thanks for any info.
--
******************************************************************
* The opinions expressed are mine and do not reflect the views of*
* Twinix Systems Inc. or 3M. *
******************************************************************
------------------------------
Date: Mon, 11 Jul 94 19:50:52 GMT
From: sequent!muncher.sequent.com!edw@uunet.uu.net
Subject: Old Parts
To: ham-homebrew@ucsd.edu
Newark Electronics SF and other cities
Arlington RElectronic Wholesaler Arlington VA
Probably radio shack
In article <2vha47$cf5@dawn.mmm.com>,
Tahir Kayani <tahir@tcdsp1.mmm.com> wrote:
>I am looking for the following parts:
>
>Lamp GE1819
>transistor 2N5490
>Voltage Regulator (12v) 7812 (NC7812C or NC7812K)
>
>Please email directly. Thanks for any help.
>--
>******************************************************************
>* The opinions expressed are mine and do not reflect the views of*
>* Twinix Systems Inc. or 3M. *
>******************************************************************
--
I think I've got the hang of it now .... :w :q :wq :wq! ^d X exit ^X^C ~.
^[x X Q :quitbye CtrlAltDel ~~q :~q logout save/quit :!QUIT ^[zz ^[ZZ
ZZZZ ^H ^@ ^L ^[c $q ^# ^E ^X ^I ^T ? help helpquit ^D ^d ^C ^c help
^]q exit ?Quit ?q \qy \xyy F.M.H.! YMHAOS edw@sequent.COM KA9AHQ 28.340
------------------------------
Date: Mon, 11 Jul 1994 23:45:37 GMT
From: ihnp4.ucsd.edu!sdd.hp.com!hp-pcd!news!steves@network.ucsd.edu
Subject: PMP
To: ham-homebrew@ucsd.edu
I think I still have that info somewhere. I built
the modem/interface and it seemed to work pretty
well -- except the Ramsey 2M I think has some problems.
If I can find the stuff I'll copy it and send it to
you if you'll email your address.
Steve Schoeneman
KA7HHB
------------------------------
Date: Mon, 11 Jul 1994 17:41:35 GMT
From: ihnp4.ucsd.edu!news.cerf.net!biivax.dp.beckman.com!mail.beckman.com!eamurashie@network.ucsd.edu
Subject: Poor Man's Packet?
To: ham-homebrew@ucsd.edu
I can't find any local libraries that have the back issue of
73 Amateur Radio Magazine for Aug 1991. That issue has the
schematic for the poor man's packet interface. Does anyone
have a postscript file, pcx file, ascii art file of the
schematic?
Unfortunately I read a nice posting from someone who had just
received Dove for the first time. Unfortunate, because I spent
all weekend tuning in listening to Dove for the first time. That
got me hooked on learning about packet radio, which used up my
entire weekend. Boy, did my girlfriend get mad!
Thanks,
Ed Murashie KE6FJU
------------------
Ed Murashie US Mail : Beckman Instruments Inc.
phone: (714) 993-8895 Diagnostic System Group
fax: (714) 961-3759 200 S. Kraemer Blvd W-361
Internet: eamurashie@ccgate.dp.beckman.com Brea, Ca 92621
------------------------------
Date: Mon, 11 Jul 1994 14:26:14 GMT
From: sinetnews!news.u-tokyo.ac.jp!wnoc-tyo-news!aist-nara!oskgate0.mei!chorus.mei!ced.mei!panasonic.com!atvl6!wiseman@rsch.wisc.edu
Subject: QST DDS article
To: ham-homebrew@ucsd.edu
There was a thread a few weeks ago about a recent QST (June ?) article on
using a DDS with a limiter/PLL on the output. Is there someone out there
who could fax me a copy? Please respond via e-mail, and I will provide a
fax number...
John
KA5WTO
------------------------------
Date: Mon, 11 Jul 1994 16:22:51 GMT
From: ihnp4.ucsd.edu!usc!elroy.jpl.nasa.gov!lll-winken.llnl.gov!fnnews.fnal.gov!gw1!nntpa!not-for-mail@network.ucsd.edu
Subject: RDF kit order lost
To: ham-homebrew@ucsd.edu
At the Dayton Hamfest there was a fellow selling RDF kits
based on the May 93 article in QST on the "Handi-Finder."
I bought a kit and it works fine.
I then followed up with an order for 25 kits for our
local ham radio club and RACES group.
Well 6 weeks later and one followup note later, still no kits.
The name of the fellow is "Stephan A. Douglas"
His mailing address is a PO box (same as on the order sheet)
and he has an unlisted number.
Has any one ordered any kits from him and received them?
The only money we are out is the cost of a money order
since the kits are to come COD, but if I knew he
wasn't going to deliver I would do something different.
My next step is to complain to the Post office.
I am also trying to buy the PC boards and make my own
kits for the club.
FAR Circuits sells boards and I have had good luck with them
in the past.
Joe Wilkes
------------------------------
Date: Mon, 11 Jul 1994 14:27:17 GMT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!gatech!news-feed-1.peachnet.edu!news.duke.edu!godot.cc.duq.edu!nntp.club.cc.cmu.edu!cantaloupe.srv.cs.cmu.edu!dolphin!ed@network.ucsd.edu
Subject: RF & IF tank alignment hints
To: ham-homebrew@ucsd.edu
I am preparing to align an older hf rig, Tempo One,
and wonder if there are any good tips on aligning the rx & tx circuits.
I have a pseudo RF generator, "a modified dip meter oscillator" in an old
heathkit RF generator box. Its not accurate freq wise, I dont want to
screw up and Peak the IF off center. I thought of just using the antenna input
and peaking from the bottom up.
Comments?
Tips?
Ideas?
Things not to do?
Ed N3SDO
Ed@fore.com
------------------------------
Date: Mon, 11 Jul 1994 14:08:48 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!darwin.sura.net!fconvx.ncifcrf.gov!mack@network.ucsd.edu
Subject: RSGB BOOK
To: ham-homebrew@ucsd.edu
In article <9407110930.aa16788@argos.ee.surrey.ac.uk> M.Willis@ee.SUrrey.ac.UK writes:
>You want the VHF Handbook, but beware, it is going to be replaced very
>soon with a new edition. The DX book is also very good but not for the USA
>as we have different bands and power limits in Europe. A lot still applies
>but a lot does not.
>
>73 Mike
You can't get the VHF/UHF DX book in the US at the moment. The ARRL has
been back ordered for months and non of the other suppliers have it.
I thought it was very good and was trying to get another copy for a friend.
Does anyone know a source in the US for this book (or how much is
it via the RSGB and how do I get it from the US?)
Joe Mack
mack@ncifcrf.gov
------------------------------
Date: Mon, 11 Jul 1994 22:01:03 GMT
From: netcomsv!netcom.com!netcom13!faunt@decwrl.dec.com
Subject: RSGB BOOK
To: ham-homebrew@ucsd.edu
I have the June RadCom in front of me, and it lists the VHF/UHF DX
Book at #18.00 for non-members of the RSGB. They ask for #1.75 for
overseas surface mail. Voice phone is 707-659015 and fax number is
707-645105 (prefix by 011 44 from the US). The easiest way to pay is by
Visa or Mastercard. The mailing address is RSGB Sales (CWO), Lambda
House, Cranbourne Road, Potters Bar, Herts EN6 3JE.
73, doug
------------------------------
Date: 11 Jul 1994 16:35:34 GMT
From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!spool.mu.edu!darwin.sura.net!news.lsu.edu!rouge.phys.lsu.edu!pulley@network.ucsd.edu
Subject: Single 813 amp?
To: ham-homebrew@ucsd.edu
Hello,
I recently came across a large part if not complete linear
amplifier which uses one 813 tube. I was hoping someone knew of
some old magazine article(maybe QST or something) which
describes such a beast. I can probably figure out what is and
is not missing, but I was hoping to make my life easier by
looking at an at least similar circuit diagram. Any help will
be appreciated.
reply to
pulley@rouge.phys.lsu.edu
or to this group.
Thanks,
------------------------------
Date: 11 Jul 1994 16:27:42 GMT
From: ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!noc.near.net!sunfish.hi.com!brainiac.hi.com!user@network.ucsd.edu
Subject: SUMMARY DSP algorithms
To: ham-homebrew@ucsd.edu
Here's what I've heard so far regarding the denoising algorithms in the
popular digital audio filters. None of this is confirmed, so take it with a
grain of salt.
The Timewave unit uses the LMS/short-time correlation algorithm, but with a
16-bit converter.
The JPS NIR-10 uses an FFT/threshold/inverse-FFT algorithm, where FFT
frequency bins that are below a threshold are set to zero. Some say that
this produces more audible artifacts than the LMS/short-time correlation
algorithm. I can't say for sure; I've only heard the NIR-10 and no others,
but it seems like a reasonable claim.
The JPS units that advertise "pink noise reduction" appear to use the
LMS/short-time correlation algorithm, like W9GR's.
Regards,
-Steve
Steve Byan internet: steve@hi.com
Hitachi Computer Products (America), Inc.
1601 Trapelo Road phone: (617) 890-0444
Waltham, MA 02154 FAX: (617) 890-4998
------------------------------
Date: 11 Jul 1994 18:44:29 GMT
From: ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!folson@network.ucsd.edu
Subject: Wanted: Popular Electronics article from May 94 issue
To: ham-homebrew@ucsd.edu
I am looking for a an article in the May issue of 1994 about
an NBS crystal radio article. If anyone could send me a copy of
the article I'd appreciate it. I will refund your stamp!! Thanks
Fran (WB9ULS). I am unable to get it from the local library or
book stores.
--
Fran Olson (WB9ULS) email:folson@prairienet.org
P.O. Box 1122
Champaign, IL. 61824-1122
U.S.A.
------------------------------
Date: 11 Jul 1994 19:52:02 GMT
From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!howland.reston.ans.net!gatech!news-feed-1.peachnet.edu!paperboy.wellfleet.com!noc.near.net!sunfish.hi.com!brainiac.hi.com!user@network.ucsd.edu
To: ham-homebrew@ucsd.edu
References <steve-080794120732@brainiac.hi.com>, <jdow.773702146@BIX.com>, <mzenierCssFwE.J0M@netcom.com>
Subject : Re: Frequency conversion - non-linear mode
> Dr. Ulrich Rohde has had several article in QEX on modeling receiver
> front ends and other RF circuits.
>
[...]
>
> It's all above me, but it looks like he can get noise figure and
> dynamic range out of a software package called Microwave Harmonica.
I dunno about Microwave Harmonica, but it seems to me that a good part of
Rohde's articles deal with calculating the system 3rd-order intercept given
the 3rd-order intercept of the pieces. This is well and good, but it leaves
me wondering how to predict the 3rd-order intercept of the pieces. I
suppose one measures it in the lab. (Lab? What's that? :-) Since I'm
lab-equipment-poor, I'm interested in good models that predict 3rd-order
intercept reasonably well.
Steve Byan internet: steve@hi.com
Hitachi Computer Products (America), Inc.
1601 Trapelo Road phone: (617) 890-0444
Waltham, MA 02154 FAX: (617) 890-4998
------------------------------
Date: Mon, 11 Jul 1994 18:12:12 GMT
From: ihnp4.ucsd.edu!usc!nic-nac.CSU.net!charnel.ecst.csuchico.edu!csusac.ecs.csus.edu!csus.edu!netcom.com!mzenier@network.ucsd.edu
To: ham-homebrew@ucsd.edu
References <jdow.773628861@BIX.com>, <steve-080794120732@brainiac.hi.com>, <jdow.773702146@BIX.com>.com
Subject : Re: Frequency conversion - non-linear mode
jdow on BIX (jdow@BIX.com) wrote:
: steve@hi.com (Steve Byan) writes:
: >Are the spice transistor models good enough to predict intermodulation
: >distortion?
: Re spice models vis a vis IMD: I dunno - I built my own small signal circuit
: analysis proggy long ago and did large signal analysis almost purely from
: "first principles" and data sheets.
Dr. Ulrich Rohde has had several article in QEX on modeling receiver
front ends and other RF circuits.
"Differences between Tube-Based and Solid State Based Receiver Systems
and Their Evaluation Using CAD" QEX, ARRL Experimenters Exchange,
April 1993.
This is a summary of a presentation "Overview of State of the Art of
Modeling the Dynamic Range of VHF, Microwave and Millimeter Receiver
Systems using Computer Aided Design" VHF Conference, Sept 19-20 1992,
Weinheim, Germany.
It's all above me, but it looks like he can get noise figure and
dynamic range out of a software package called Microwave Harmonica.
Mark Zenier mzenier@netcom.com mzenier@eskimo.com
------------------------------
End of Ham-Homebrew Digest V94 #191
******************************