home *** CD-ROM | disk | FTP | other *** search
- 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
-
- ----------------------------------------------------------------
-