home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
QRZ! Ham Radio 8
/
QRZ Ham Radio Callsign Database - Volume 8.iso
/
mac
/
files
/
q_review
/
mxm.kit
< prev
next >
Wrap
Internet Message Format
|
1996-06-25
|
7KB
Date: Thu, 29 Apr 93 15:56:21 -0500
From: adams@chuck.dallas.sgi.com (Charles Adams)
Message-Id: <9304292056.AA21634@chuck.dallas.sgi.com>
To: qrp@Think.COM
Subject: MXM Rig
Gang,
Jeff, AC4HF, i think i have the call right. asked about the new
MXM rig, so in order to save time i'll give you a quick update and
then a final review when i get it assembled.
first: it's a transceiver, single band
second: board is 4 1/2" x 3 5/8" (11.2cm x 9.2cm)
third: uses the superRX receiver and transmitter from WA6IVC (Bruce)
nice board with silkscreen. it's not green, but it goes inside a
case anyway. ;-)
the kit is not out yet, but will be shortly. i'll let you know.
Bruce will be showing the rig at the Hamcom fest in June here in dallas
area.
the rig is vfo controlled, thus eliminating the previous problem of
being crystal controlled. will work the whole band. can be set up for
80, 40, 30, and 20 meters. don't know if other bands are gonna be
available for any time soon.
kit doesn't come with cabinet and additional hardware (key jacks,
power plug, etc.). this may be a turnoff for some people but not
for the real hackers. :-)
i'll shoot for getting it built this weekend or middle of next week.
output transistor is 2SC799 and should be capable of 5 watts out.
may run hot, but hey, silicon doesn't melt until the temp gets real
high......
72 de k5fo chuck dit dit
p.s. rig to sell for $99.50 or so. definitely the hotest receiver around.
500 Hz bandwith with possibility of going down to 200 Hz bandwidth,
but you'll probably get some 'ringing' at 200 to 100 Hz. uses Cohn
filter in the IF.
more details to follow.
ciao,
chuck
======================================================================
Date: Mon, 21 Jun 93 17:58:48 -0500
From: adams@chuck.dallas.sgi.com (Charles Adams)
Message-Id: <9306212258.AA12553@chuck.dallas.sgi.com>
To: qrp@Think.COM
Subject: MXM Transceiver
Gang,
Jeff Gold(AC4HF), famous QST author and member of this group, periodically
pings me about the new MXM simple transceiver. i've gotten mine in
a case and going finally. too many trips and not enough room for
equipment on the road to finish sooner. missed qso with the famous
Jim Kearman. one of these days.
i'll post final dimensions of the board, as i don't have them here
at the office.
the receiver section is the SuperRX plus an addition IF stage in
the front end with Cohn crystal filter for 10Mhz IF followed by
455 Khz IF, thus a dual conversion receiver. bandwidth is about 500
cycles with the filter.
i was on 40 meters early yesterday morning. i heard VE3s until about
10 am CDT. band was very long and signals pretty strong for this time
i year, INMHO. lots of W1s and W2s on.
i had mxm rcvr and icom 725, yaesu ft-707, and ohr spirit rcvrs on 40
meters. the mxm was the most sensitive. it heard signals the others
did not. qrn was present as tropical depression was to the east of
texas yesterday morning and some rain showers in northern part of state.
the mxm receiver has more noise than the ohr spirit and about the same
as the icom 725, which i consider a noisy receiver with respect to
background noise levels. the yaesu ft-707 quieter but lacks some
in sensitivity relative to the mxm. the yaesu ft-707 is a much
better receiver than the icom 725.
pluses for mxm rcvr -
o good sensitivity
o good stability
o cheap
o good selectivity
minuses -
o more difficult to align for the general builder, but not impossible
just requires a little more time and effort on the part of the
builder. i used the scope, frequency counter, and great care to
align. but i do this with everything anyway.
o a little more background noise internally
o no RIT, but not a severe handicap to me
transmitter is vfo controlled with osc for receiver and another
mixer (NE602 mixer). i've got mine tuned to 500mW out into dummy
load. with 2SC799 final PA, should be able to get 3 or more out.
qsk without relay. a real plus to me.
parts complement;
6 ics - 4 NE602s, MC3340, and LM380
6 transistors - 4 2N2222s, 2N3906, and 2SC799.
7 IF transformers
i'd say the board is about 3.5 x 4.5. i'll just have to go back
and measure it.
more details to follow.
ciao,
"This is UNIX(tm)! I know this." - Lex in Jurassic Park in front of
SGI workstation.
Chuck Adams, K5FO - CW spoken here....70+ wpm
adams@sgi.com
======================================================================
Date: Sat, 9 Oct 93 21:52:03 -0500
From: adams@chuck.dallas.sgi.com (Charles Adams)
Message-Id: <9310100252.AA14256@chuck.dallas.sgi.com>
To: qrp@Think.COM
Subject: new MXM es R&R revies
...
Here is the latest ad that came out today from MXM Industries,
Rt 1 Box 156C, Smithville, TX 78957 (512) 237-3906 and I quote
from the flyer that I picked from Bruce Williams, WA6IVC, owner
and designer. I am not paid by or financially connected to MXM
Industries, just a satisfied customer.
-------------------------------------------------------------
Hi-Performance CW Transceiver Kit 80-40-30-20 Meters
+----------------------------------+
| |
| SIMPLE TRANSCEIVER |
| |
+----------------------------------+
Double Conversion Excellent Dynamic Range
Super-Het Receiver Speaker Volume Audio
Dual IF Filters True RF Monitoring
Pass Band Tuning 3-4 Watts Power Output
Double Balanced Mixers QSK Full Break-In
The SIMPLE TRANSCEIVER is not a re-hash of an old design. It is
new, inovative and outstanding. The receiver performance is the
best of any kit we have tested. It rivals the sensitivity and
selectivity of many of the expensive commercial transceivers. The
QSK is smooth and you monitor your transmitted signal not some silly
side tone. The pass band tuning feature will allow you to vary the
effective filter width and the pitch of the received signal. The
transmitter features a solid 3 to 4 watts output power with no
chirps or clicks. It is also SWR protected just like the big radios.
You kit will include: PRINTED CIRCUIT BOARD, ALL BOARD MOUNTED
COMPONENTS, 7:1 VERNIER DRIVE TUNING CAP, ALUMINUM CABINET. You
will need to pick up a few minor parts, such as connectors of
your choice, from your local supplier or Radio Shack.
$129.95 and $5 S&H Limited Time Only
----------------------------------------------------------------