QRZ! Ham Radio 5/QRZ Ham Radio Callsign Database - Volume 5.iso/digests/homebrew/940135.txt

Internet Message Format | 1994-11-13 | 15KB

Date: Fri, 20 May 94 04:30:50 PDT
From: Ham-Homebrew Mailing List and Newsgroup <[e-mail]>
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Subject: Ham-Homebrew Digest V94 #135
To: Ham-Homebrew


Ham-Homebrew Digest         Fri, 20 May 94       Volume 94 : Issue  135

Today's Topics:
          40m Transmitter or VFO project??- any suggestions?
                          Cobra CB Radio MOD
      HELP! Need 'advice' on transmitter construction. (3 msgs)
                   Man named Loomis invented radio?
                    Repeater linking, what radios?
                 What I need..and I am looking for..
          Where can I obtain Millen high voltage connectors?

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Archives of past issues of the Ham-Homebrew Digest are available
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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.
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Date: 20 May 94 05:50:27 GMT
From: dog.ee.lbl.gov!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!ruger-13.slip.uiuc.edu![e-mail]
Subject: 40m Transmitter or VFO project??- any suggestions?
To: [e-mail]

Hello all,

I recently purchased an old boat anchor which is an upgrade from an older
boat anchor, but most importantly, it was cheap and it works well.  I am
planning on upgrading to general this summer and am looking for a nice 40m
project (or if you really really prefer another band, I'll take suggestions
about bands also).  I was thinking along the lines of a QRP cw transmitter
that would allow me to make a little set-up for myself.  I have a small
transmitter (only transistor and such) already in mind that was origionally
x-tal stuck, and I figure I could pop in a vfo instead of the x-tal in the
project if I wanted, so I'll take suggestions on vfo projects also.  I
recently did a small 2m kit, and I will be much happier in the lower freq's
 :)  (lead length and such).

In anycase, I'm in your hands, mold me and shape me into something nice!!!

TNX A TON (that's about what this thing weighs ;)
Allen Hall    [e-mail]

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Date: 19 May 94 17:30:57 GMT
From: dog.ee.lbl.gov!agate!howland.reston.ans.net!EU.net!news.eunet.fi![e-mail]
Subject: Cobra CB Radio MOD
To: [e-mail]

I understand that there are a number of modifications that can be performed o
the Cobra model 148GTL CB radio, and am interested in obtaining them. I
tried looking at oak.oakland.edu under the /pub/hamradio/mods section but
have not found anything yet.

Thanks for any help!


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Date: 19 May 94 19:07:11 GMT
From: agate!overload.lbl.gov!dancer.ca.sandia.gov!cronkite.nersc.gov!fastrac.llnl.gov!lll-winken.llnl.gov!zeus.ieee.org!europa.eng.gtefsd.com!howland.reston.ans.net!EU.net!uknet!bcc.ac.uk!@
Subject: HELP! Need 'advice' on transmitter construction.
To: [e-mail]

[e-mail] (Pleasure Death) writes:

>Hi,

>i just built a 2-transistor, .2 Watt transistor.
>I can get pretty good range with it (approx 250 metres) with a 'bad'
>set-up ,ie not covered, poor antenna.

>I'm looking to build a bigger, more powerful model, and also make
>an efficient antenna.

>Can anyone give me any information on doing this?
>Also can anyone reccomend any TEXTS are transmittor construction,
>esp one with circuit diagrams.....


What frequency?

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

Date: 19 May 94 22:13:43 GMT
From: dog.ee.lbl.gov!agate!howland.reston.ans.net!wupost!slacc.com![e-mail]
Subject: HELP! Need 'advice' on transmitter construction.
To: [e-mail]

I recommend that you get a copy of the ARRL (American Radio Relay League)
handbook (published annually). There are similar publications put out by
the amateur radio organizations in other countries as well.

Noel Moss
[e-mail]

           SLACC STACK BBS - St. Louis, Missouri
The bulletin board service of the St. Louis Area Computer Club

                   +1 314.367.1903

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

Date: Thu, 19 May 1994 13:15:00 GMT
From: ihnp4.ucsd.edu!news.acns.nwu.edu!math.ohio-state.edu!howland.reston.ans.net!EU.net!ieunet!tcdcs!news.tcd.ie!unix1.tcd.ie![e-mail]
Subject: HELP! Need 'advice' on transmitter construction.
To: [e-mail]

Hi,

i just built a 2-transistor, .2 Watt transistor.
I can get pretty good range with it (approx 250 metres) with a 'bad'
set-up ,ie not covered, poor antenna.

I'm looking to build a bigger, more powerful model, and also make
an efficient antenna.

Can anyone give me any information on doing this?
Also can anyone reccomend any TEXTS are transmittor construction,
esp one with circuit diagrams.....


Thanks.

Si.

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

Date: Thu, 19 May 1994 14:29:00 GMT
From: newsflash.concordia.ca!pavo.concordia.ca![e-mail]
Subject: Man named Loomis invented radio?
To: [e-mail]

>
>Loomis took advantage of the roughly 300 volts/meter potential in the
>atmosphere to activate his transmitter. The current flow is small, except
>during thunderstorms, but it was sufficient to generate a detectable signal
>at a distance in the days before widespread use of electricity.
>
>Nathan B. Stubblefield's work was much further advanced. He sent *voice*
>signals over distances greater than 30 miles before Marconi et al sent
>spark signals. His system was powered by batteries and apparently worked
>on the principle of sheet conductance. (He was very secretive about the
>exact details.) He conducted a demonstration for Congress where he
>communicated by voice with a ship in the Potomac from the shore. His was
>the first "underground" radio station.
>
>And of course there was Tesla. He had radio controlled boats operating
>in the lake of Central Park in one demonstration well before Marconi
>generated his first sparks. Tesla was fasinated by resonance phenomina.
Message-ID: <[e-mail]>
References: <2r8f28$[e-mail]> <[e-mail]> <[e-mail]>
Organization: Concordia University
News-Software: VAX/VMS VNEWS 1.41

Reginald Aubrey Fessenden, a Canadian, actually sent the first voice message
without the help of wires on December 23, 1900 from Cobb Island in the Potomac
river. He also improved Marconi's wireless system, made the first radio
broadcast, and invented sonar. An article appeared in Equinox magazine several
years ago that detailed Fessenden's achievements.
-Mark Hillier        Internet: [e-mail]
            Amateur:  VE2HVW
            PACKET:   VE2HVW@VE2FKB
" I hear, I forget. I see, I remember. I do, I understand"

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

Date: Wed, 18 May 1994 20:34:49 GMT
From: ihnp4.ucsd.edu!ucsnews!newshub.sdsu.edu!nic-nac.CSU.net!usc!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!howland.reston.ans.net!spool.mu.edu!torn!news.cs.uwindsor.ca!lambton!david@network.
Subject: Repeater linking, what radios?
To: [e-mail]

We are are thinking of upgrading our 2m repeater to include some
remote recievers, linked back on 70cm and selected through a
Doug Hall Electronics voter.

What is the general wisom as to sources of link recievers/transmitters
what to use for remote (cross band) repeaters, expected ranges,
power level, etc?

I think that a Kenwood 732 would make a cheap remote site, if it
was set to low power it could probably handle the duty cycle.
A small brick could boost the power.

We still need recomendations on recievers that have fixed audio
and COS outputs, and are rugged enough for this use.  Synthisized (sp?)
would be nice.

Has any one tryed this?  Ideas?

73 de Dave
--------------------------------------------------------------------
David Grant                VE3DGR             [e-mail]
Lambton College, Sarnia, ON CANADA            [phone] x348

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

Date: 18 May 94 03:59:54 GMT
From: agate!howland.reston.ans.net!cs.utexas.edu!oakhill!val!afarm![e-mail]
Subject: What I need..and I am looking for..
To: [e-mail]

Ben,

I will need to acquire a portable VHF data radio and packet connector before I
can do anything.  If you know of anyone that is selling either of these, please
tell them to send me a message of what they are selling and how much it is
selling for.  I will try to buy from people that Joe Thiel would be willing to
buy from.

I am a programmer for the Health Department.  I probably will not have any
problems connecting the equipment together, and to my computer.  I have already
assembled (built it) and configured (setup CMOS, etc.) my IBM 386DX.  I think
the only problem that I will encounter will be in configuring software between
each piece so that I can connect to the internet.  I will be able to get all of
the assistance I need from Joe.  If I need any more assistance, I will send you
a message. I have an account on internet via the Health department. Do you mind
if people access A. Farm via the internet?  Can I access A. Farm Via the
internet?--I can ask Joe, but since I am writing this message, I will just ask
you.

Do you want scanned color images placed on your BBS?  These images do take up
room, even in the compressed and 16color format.  I have a scanner, and I can
scan in a image for you.  As for programs etc for uploading, What are you
interested in. I might have something you would want, or can generate something
that does the same thing.  I will be restricted by my work demands and I cannot
give you anything that would look like it could have come from my work (even if
I created the code).

Well, I must get some work done.  I also need to study for the Amateur Radio
Exam.
Cynthia

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

Date: 18 May 1994 19:01:46 GMT
From: ihnp4.ucsd.edu!swrinde!gatech!udel!news.udel.edu!diusys![e-mail]
Subject: Where can I obtain Millen high voltage connectors?
To: [e-mail]

David Feldman ([e-mail]) wrote:
: I'm trying to find a source for Millen-type (or real Millen) high voltage
: connectors - they're a single conductor plastic body connector used on ends of
: the cable between a high power tube amplifier & it's power supply.
: Name and/or telephone number of vendor(s) greatly appreciated.

: 73 Dave WB0GAZ [e-mail]

Radio Kit used to carry these, I think.

PO Box 973
Pelham, NH  03076

[phone]

Might be worth a try.  Good Luck,   Dave  WA3U

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

Date: 19 May 94 21:22:57 GMT
From: agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news.cerf.net!mvb.saic.com!MathWorks.Com!europa.eng.gtefsd.com!howland.reston.ans.net!vixen.cso.uiuc.edu!ux4.cso.uiuc.edu![e-mail].
To: [e-mail]

References <[e-mail]>, <2rev9o$[e-mail]>, <2rg9rq$[e-mail]>u
Subject : Re: Philips "Dream Machine" 8XC750 design contest

[e-mail] (Chuck McManis) writes:

]Christopher J Burian ([e-mail]) wrote:
]: 'Tis true.  Perhaps Philips should follow Dallas' lead and reduce the number
]: of clock cycles per machine cycle, instead of just pushing the clock and
]: internals to the limit.  (Maybe that's why they made it run up to 40MHz,
]: to make it competitive.)

]A very good idea that I hope Phillips picks up on, I have the impression
]though that they got this core loaded up into their ASIC library and now
]they are whipping out chips right and left. Its much lower risk to stick
]with a working core.

Dallas seems to be the company into unique packaging variations.  They say
they're soon going to put onboard memory on their hi-speed 80c320, I suspect
it'll be NVRAM.  Maybe they'll forfeit some leads and stick a version in a
skinny dip package.  2K of program memory, a UART & serial programming, and
18-24 pins would be nice.

Chris Burian

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

Date: 19 May 1994 18:06:50 GMT
From: news.cerf.net!mvb.saic.com!MathWorks.Com!yeshua.marcam.com!charnel.ecst.csuchico.edu!olivea!koriel!news2me.EBay.Sun.COM!rampart.EBay.Sun.COM!handler.Eng.Sun.COM!pepper!@@ihnp4.ucsd.edu
To: [e-mail]

References <2rdmra$[e-mail]>, <[e-mail]>, <2rev9o$[e-mail]>ew
Subject : Re: Philips "Dream Machine" 8XC750 design contest

First, I didn't mean to "compare" Mhz. I agree with everyone that they aren't
comparable. However I stick by my original statement that the Microchip "PIC"
and the 8xC750 are in the same "class". (This is a tautology since I also get
to define the term "class" :-)

Christopher J Burian ([e-mail]) wrote:
: 'Tis true.  Perhaps Philips should follow Dallas' lead and reduce the number
: of clock cycles per machine cycle, instead of just pushing the clock and
: internals to the limit.  (Maybe that's why they made it run up to 40MHz,
: to make it competitive.)

A very good idea that I hope Phillips picks up on, I have the impression
though that they got this core loaded up into their ASIC library and now
they are whipping out chips right and left. Its much lower risk to stick
with a working core.

: Nevertheless, I'm glad I've got a skinny-dip 8031-core chip to play with.
: I'm just miffed that it doesn't have a UART, since just about everything I
: build talks to my PC via RS-232, and so I'm stuck with low speed and
: complicated, program space-hogging comm routines.

Someone else just posted the serial I/O routines for the 8031 and they were
pretty small. (Dave Dunfield I believe). I don't mind doing bit-banger
routines, but I do mind (on the PIC at least) that I really have to
use clever programming to get asynchronous I/O.

--
--Chuck McManis                 All opinions in this message/article are
FirstPerson Inc.                     those of the author, who may or may not
Internet: [e-mail]   be who you think it is.

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End of Ham-Homebrew Digest V94 #135
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