Got in the first 10 Midland XTR memory expansion wafers. 6m groopannouncment. Conversion article project.

Glenn Baumgartner gbaumgartner2 at
Thu Dec 27 20:37:28 CST 2007

Ok gents we are well on our way to having numerous 6 m radios with voice 
capability lots of power and a ground wave range in the tens of miles at a 
minimum most of the time.  Work I have read about in the past indicates that 
purpose built meteor networks (SnowTel and Alascom)  got out to 100-150 
miles all the time just on ground wave and forward scatter, meteors only 
came in to play after about 400 miles and out to about 1200 miles as I 
remember, but FAST was always the key to keeping up a link and making a 
system profitable.   Personally I think the digital operation of our radios 
is the way to go.  Voice of course should not be prevented or eliminated but 
Meteor Scatter I would bet is the way to plan going if some new USEFUL 6 
meter technique or service is to evolve.  Anyone want to hazard a guess the 
"BEST" (read, cheapest, easiest, most universal, quickest)  way to do it? 
1200 baud packet?  AFSK?    HSCW...(high speed CW) which with an FM radio 
might really only be Audio keying of the radio driven by a sound card I 
suppose.  True CW would be a bit difficult with an FM radio but not 
impossible if you really wanted to nearly rebuild the radios.  For the 
moment it seems that the traditional  "2 meter" style FM 1200 baud packet 
looks best to me.  Any one want to argue? (or propose a better way)  We need 
an approach to try experimenting with for starters and have a next effort 
plan if the first doesn't work out so well in the foreseeable future.   I've 
little to no experience with packet at the moment and I have some doubts 
about the protocol and whether it can handle small and or many fragmented 
packets.  Seems to me if the packets were quite small that if anything got 
thru on a given meteor trail then a whole (small) packet would.  Comments?? 
Multiple small packets sooner or later make a message no matter the time to 
assemble them.  What does anyone think about "fast" PSK 31, ie MT 63?   or 
faster?  Just a little chum for AMRAD's sharks to feed on for now.  GAME ON 
guys!  Lets start thinking, building, experimenting we've been a bit dull as 
a radio club for some time now. 73 ..KA0ESA.

----- Original Message ----- 
From: "Tom Azlin, N4ZPT" <n4zpt at>
To: "Michael Chisena" <ka2zev at>
Cc: "tacos AMRAD" <tacos at>; "Evan Alford" <ear_ltd_ at>
Sent: Wednesday, December 26, 2007 8:58 PM
Subject: Re: Got in the first 10 Midland XTR memory expansion wafers. 6m 
groopannouncment. Conversion article project.

> Hi Mike,
> Not sure about others but I will not be able to make a Tuesday night
> net.  That is the Fairfax ARES meeting night, the VWS board meeting
> night and the Vienna Wireless HF digital net night. the previous
> activity night was on Wednesdays at 7PM or so.
> I am interested in the upgrade to the 6m radio.
> 73, Tom n4zpt
> Michael Chisena wrote:
>> All, Got the first ten units of the plug in module that expands the
>> Midland 70-0375C (and similar xtr) from 22 to 99 channels.   I hope to
>> get a little time to edit my 99 channel list, and print up some copies.
>>   Here is what I'm thinking.   If you have one of these radios, bring it
>> to Taco's Saturday.  I can drop the wafer in during lunch. Four screws,
>> one snap on housing, that's the mechanical side.   If I bring a gell
>> cell battery, cable and control head, I might be able to re flash the
>> new program at the table, if not, then in the car.
>> ..................... !   Give this a look at.
>> Feel free to join in and make
>> comments.   Looking to start the 6m net on Tuesday nights around 20:00.
>> The first few are Tuesday Jan 8Th, 15Th The third Tuesday is the 22ND,
>> that's the dinner meeting at Old Dominion Brewing in Ashburn.
>> .................................................. Been casually working
>> on an article on how to convert these radios. This is some of what I
>> have so far. Comments welcome.     Ive been reprogramming the TVI filter
>> aka Low Pass on the XTR edition of that radio 70-0375C and have been
>> getting flat 110 watts from 50 to 53MHz.   Also look at my flickr page
>>   it
>> is by no means complete so treat this like a work in progress.   Keep it
>> safe Mike
>> "You are, what you do, when it counts"
>> The Masso
>> "Gravity, the quickest way down"
>> Mayor John Almafi
>> "You ever drop an egg, and on the floor you see it break?
>> You go and get a mop so you can clean up your mistake.
>> But did you ever stop to ponder why we know it's true?
>> If you drop a broken egg you will not get an egg that's new?"
>> MC Hawking
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