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Subject: Info-Hams Digest V92 #1309


Info-Hams Digest            Mon, 14 Dec 92       Volume 92 : Issue 1309

Today's Topics:
                           2m rig in Europe
            Halogen Lamp/Dimmer causes interference Help!
                    Highest frequency modem chips
                       IRF 511 as RF Power Amp
                 Need docs on Butternut trap vertical
            WANTED: Morse training software for Macintosh

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

Date: 14 Dec 92 10:20:15 GMT
From: news-mail-gateway@ucsd.edu
Subject: 2m rig in Europe
To: info-hams@ucsd.edu

Depending on rig Frequencies may be a problem. Remeber UK is on 25Khz
US on 15. Also Kevin Purcell says no one uses CTSS in Europe. Well
that is changing. Some UK 70cms repeaters now have sub-audio CTSS
fitted which changes the way they operate. I guess 2m ones may soon
aquire this. Dave G4UGM

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

Date: 14 Dec 92 11:45:37 GMT
From: news-mail-gateway@ucsd.edu
Subject: Halogen Lamp/Dimmer causes interference Help!
To: info-hams@ucsd.edu

In Info-Hams Digest V92 #1308 Jerry S. Weiss writes: 

>You just switch between cycles to keep the noise low.  The more cycles that
>conduct (averaged over time) cause the bulbs to burn brighter.  Just adjust
>the duty cycle to vary the amount of light.  There are probably some glue
>chips around designed to implement this cheaply.  You get more discrete
>changes this way, but the noise reduction is worth the additional circuity.

This'll work, but the resultant flicker is quite unpleasant.
Think about it: suppose you wanted to cut a bulb down to half-
brightness using this method. Then you'd want to remove every
second cycle completely to cut the power to the bulb. You can
actually try this by sticking a diode in the live feed to the
bulb. As you'll see, the bulb flickers noticeably. Given that the
US electricity supply is 60 Hz, as against 50 Hz here in Ireland,
the flicker will be much less noticeable down to half power, but
once the number of on-cycles falls to less than 24 per second,
you'll no longer have a smooth dimming effect.
   Cheers,
   Simon Woodworth.

=================================================================
Simon Woodworth.                |  woods@glas.rtsg.mot.com
Motorola (Ireland) Ltd.,        |  Don't blame my employers
Cork, Ireland.                  |  for anything I say! :-)
-----------------------------------------------------------------
"No matter where you go, there you are!"
- USS Excelsior bridge dedication plaque.
=================================================================

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

Date: Mon, 14 Dec 1992 08:52:47 GMT
From: gumby!destroyer!cs.ubc.ca!fs1.ee.ubc.ca!johni@yale.arpa
Subject: Highest frequency modem chips
To: info-hams@ucsd.edu

Hi, I am a control guy but I like to built some neat communication gadgets. 
Would anyone tell a fellow techie (albeit from the other side of the
engineering world) this vital piece of info?

  What are the highest frequency (either carrier or bit) modem chips that 
  you know of?

Please send replies to me.  I will summarize to the net if there are enough 
responses.  Thanks in advance.

John Ip

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

Date: 14 Dec 1992 10:14:37 -0000
From: pipex!warwick!warwick!not-for-mail@uunet.uu.net
Subject: IRF 511 as RF Power Amp
To: info-hams@ucsd.edu

If you do have problems driving the FETs, it might be worth considering an
emitter-follower type driver. In particular, the complimentary em-foll.
pair seems like an effective driver for capacitive loads. It's perhaps
easiest to think in terms of operating the FET as a switch, and driving it
between being fully off and saturated. Due to the large capacitance at the
input you will want a low impedance driver to ensure adequate switching speed,
which is where the follower circuit comes in. Although I have no experience
with the IRF511, I have used this technique with an RF FET at 50 MHz, and it's
worked fine. If you have access to it, Motorola Applications Note AR-141,
found in the RF data book, gives useful info on this idea.
The above of course only applies to non-linear amps., as I'm assuming
you'll be using it for CW.

Good luck,

Simon G0GWA.

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

Date: 13 Dec 92 06:41:03 GMT
From: dog.ee.lbl.gov!overload.lbl.gov!agate!spool.mu.edu!olivea!charnel!rat!mimbres.cs.unm.edu!constellation!osuunx.ucc.okstate.edu!olesun!gcouger@network.UCSD.EDU
Subject: Need docs on Butternut trap vertical
To: info-hams@ucsd.edu

I picked up a Butternut trap vertical at a ham fest with
no documetation. I will be glad to pay cost of copying and
postage.
Thanks
Gordon
Gordon Couger
AB5Dg   Agriculture Engineering Oklahoma State University
gcouger@olesun.agen.okstate.edu 405-744-6514 day 744-2794 evenings   

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

Date: Mon, 14 Dec 1992 07:58:48 GMT
From: mcsun!news.funet.fi!hydra!klaava!stickler@uunet.uu.net
Subject: WANTED: Morse training software for Macintosh
To: info-hams@ucsd.edu

Does anyone know of a Morse Code training program for the
Macintosh that can be used for increasing speed, etc.?

I learned Morse using a program called SuperMorse for the PC,
which is a fantastic program -- however I no longer have
convenient access to a PC to use it, and would like to use
some form of software to increase my speed.


Any help will be greatly appreciated.



/////////////////////////////////////////////////////////////////////////
  Patrick M. Stickler  KC4YYY, OH2LUV    The comments contained herein
  WSOY - Information Systems Division    do not necessarily reflect the
  Helsinki, FINLAND    (psti@wsoy.fi)    official views of my employer.
/////////////////////////////////////////////////////////////////////////

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

End of Info-Hams Digest V92 #1309
******************************
Newsgroups: rec.radio.amateur.misc