MFJ-432 Voice Keyer

Tue Oct 8 14:09:05 EDT 1996

silver>Dear friends,
silver>
silver>I intend to purchase a voice memory keyer for the upcoming contests and I am thinking about the MFJ-432 Voice Me
mory Keyer, the reason is: I can use it with my TS850 or my FT757GXII, either one. 
silver>
silver>However I concern about the product's quality. I'd like to receive some notes about this MFJ product.
silver>
silver>73's,
silver>
silver>and cu on the CQWW (SSB and CW)
silver>
silver>Carlos - PY1CAS
silver>E-mail: silver at ax.apc.org
silver>
silver>

hi silver

I report about MFJ-432.
First, it is practical sufficiently in the very much natural timbre.
The body has a connector for the message.
I made small remote box using it.
It is the switch of the repeat, a volume in the repeat interval in addition to the button of the message to it.
, Then, it put the volume of the input level.
It is possible for the dry battery of 9v to work the body in addition to 12v$B!<(Bdc.
However, as for it, only the 24-hour degree comes by the running.
The microphone connector can choose yaesu, icom, kenwood by the janper setting inside.
The problem is in the repeat switch.
It stops after a message is once transmitted already when cutting a repeat switch during transmission of the message.
There is a way of putting a short-blank message in this and making this kill-switch, too, but it doesn't practicality w
hitch  need  2-action, which lets out a short-circuiting blank which cuts a switch of the repeat of reception's breakin
g off among very short time.
It thinks that the fundamental reorganization around the timer IC is necessary.
Doesn't it know a concrete improvement plan about whom it is about this?

Please to direct me if there is an other question

73-dx

Kaz JG4CLV   /JA3ZOH        <<<jg4clv at hiroken.or.jp>>>

>From broz at csn.net (John Brosnahan)  Tue Oct  8 14:20:07 1996
From: broz at csn.net (John Brosnahan) (John Brosnahan)
Date: Tue, 8 Oct 1996 07:20:07 -0600
Subject: SUMMARY:  Computer Cabinets
Message-ID: <199610081320.HAA25298 at lynx.csn.net>

I received a number of good suggestions for quieting down the
RFI from my newly upgraded contest computer, and many
requests for the information that I gathered so there are clearly
a number of people in the same boat.

Power supply noise is the biggest single problem.  Much more of a 
problem than digital noise from the microcomputer.  Many of the
power supply vendors have eliminated the RFI filter that reduces the
switching noise from conducting out over the AC mains by designing
new boards without filters or by just leaving off the components and
adding jumpers as appropriate (or inappropriate, I guess).

Two of my systems have supplies that only have small disk ceramic
caps to reduce the noise going out over the AC mains.  Another
supply has the usual LC filter but the monitor outlet is on the wrong side
of the filter--so that the RFI is sent down the monitor power cord, making
for a nice antenna.

It appears that there is room to add a typical Corcomm brand RFI filter
AC connector in place of the regular connector and I will see what that
does in the way of improvement.  I will also change the monitor connector
to the AC mains side of the filter rather than leave it on the RFI generating
side of the filter.

Digital noise will probably need to be reduced as well, once I get the
power supply noise knocked down far enough to find the digital stuff.
Most of the cheap cabinets do not mask the paint from areas where
the cover fits the chassis so there is not even much accidental 
grounding--just the grounding from the screws on the back.  I'll
probably scrape the paint off along the seams and may try to
add some finger stock as well.  Not much you can do to the "holes"
in the case for drives, etc.  And I may need to add some additional
ferrite to the cables.  It was also suggested that the monitor or keyboard
may be the noisy culprit but that doesn't appear to be the case with
more modern monitors and keyboards--but I do recall big problems
will early monitors.

The easiest solution might be to just buy new cases and power supplies.

Enlight (aka Enlite) has been suggested as a good solution.  Their
cabinets use the heavier sheet metal and don't have the typical
sharp edges of the really cheap ones.  Their power supplies are also
well designed and quiet.  One of their vendors has a web page with
pictures of the cabinets and be can be reached at:
http://www.rcsystems.com/frameindex.html
And you can find ads for their cases in Computer Shopper

Also mentioned a number of times is the company PC Power & Cooling
(www.pcpowercooling.com) OR:
5995 Avenida Encinas, Carlsbad, CA 92008
\(619)931-5700 (800)722-6555 Fax (619)931-6988

They make some very high quality cabinets, made in the USA of all 
steel construction and they claim to have power supplies that are very
quiet both electrically as well as acoustically.  The cases look somewhat
plain since it is not as easy to give the sculptured look to an all steel
case as it is with an injection molded plastic front panel.  But even
the plastic cases have a steel sub panel and both the plastic and
steel cases have cutouts for drives.  So the all steel part may not be 
all that important--just look for cases that make an attempt to ground
the cover around all of the edges.

Nobody said building a contest station would be easy!

Thanks to:  (in no particular order)
N4YOS
KB9NMU
N1PBT
KC2X
W9ZRX
WT2G
KB5UL
N0DH
KL7Y
W9WU

73  John

John Brosnahan  W0UN
24115 WCR 40
La Salle, CO 80645

"Radio Contesting IS a Contact Sport"

>From hatched3 at boat.bt.com (Hatcher, Darren, HATCHED3)  Tue Oct  8 15:02:00 1996
From: hatched3 at boat.bt.com (Hatcher, Darren, HATCHED3) (Hatcher, Darren, HATCHED3)
Date: Tue, 08 Oct 96 14:02:00 BST
Subject: Magentic loops in a contest
Message-ID: <325A50B3 at msmsmtp1.comnet.bt.co.uk>

Hi All,

I've been thinking about using a large [ARRL] Magnetic Loop as a receive 
antenna to complement a 402CD on 40m for Contest use. Has anyone had 
experience of mixing Magnetic Loops into a contest station? I'd like to use 
it in CQWW at the end of the month, but only if it will make a difference 
and won't cause problems.

See you out there!

Darren Hatcher - G0WCW
hatched3 at boat.bt.com
http://www.btwebworld.com/olsen/mrs.htm

P.S. M6T will be multi-multi this year for CQWW SSB - email for info.