[Motorola] Astro Spectra VHF Range 2 to Range 1

[w0web]

Navy/Marines MARS here in the San Francisco Bay Area
----- Original Message ----- 
From: <w7trh at comcast.net>
To: "Discussion of equipment manufactured by Motorola" 
<motorola at mailman.qth.net>
Sent: Monday, November 16, 2009 16:20
Subject: Re: [Motorola] Astro Spectra VHF Range 2 to Range 1


>
>
> The radio may say 136 - 174 mHz, but in most cases there are several 
> "Ranges" within that fx. spread, unless the unit is really broadband!(Like 
> the Bendix-King PRC-127 HT).
>
> To which branch or MARS are you applying? I have been in AFMARS for 23 
> yrs., and am a member of the McChord AFB Base Support Team. (I do not 
> think MARS will be going to narrow band!!)
>
>
>
> Best Regards,
>
>
>
> Tim Hardy
>
> W7TRH / AFA0TP Wa.
>
>
>
>
>
> ----- Original Message ----- 
> From: "w0web" <w0web at comcast.net>
> To: "Discussion of equipment manufactured by Motorola" 
> <motorola at mailman.qth.net>
> Sent: Monday, November 16, 2009 4:10:55 PM GMT -08:00 US/Canada Pacific
> Subject: Re: [Motorola] Astro Spectra VHF Range 2 to Range 1
>
> Will my CDM-1250 VHF(136-174) work on MARS??? I'm thinking about applying
> ----- Original Message ----- 
> From: <w7trh at comcast.net>
> To: "Discussion of equipment manufactured by Motorola"
> <motorola at mailman.qth.net>
> Sent: Monday, November 16, 2009 16:06
> Subject: Re: [Motorola] Astro Spectra VHF Range 2 to Range 1
>
>
>>
>>
>> John,
>>
>>
>>
>> So .........Did you ever change a range 1 to a range 2 by fooling RSS? I
>> have a chance to transfer a quantity of ASTRO Spectras to our McChord AFB
>> BST., if this can be accomplished! The range 2 will do "us" no good for
>> AFMARS use! I heard NAVY MARS is NOT going narrow band, so I can see ARMY
>> or AF going there either, as that would interfere with 
>> "Interoperability"!
>> Too bad these radios are federal property! I know they will be "Crushed"
>> when turned in to DRMO! Too bad! The radios I have are the 2.5 kHz and 1
>> meg. Now I have to find the RSS version as high or higher than the radios
>> were programmed with! I have not "Read" the radio yet, with the RSS I 
>> have
>> on hand. I may check with McChord "LMR", but I'll bet they don't know how
>> to hex edit to change the range from (2) to (1)!!
>>
>>
>>
>> Did you actually have 1-3 microvolts sens, or did you mean 0.1 to 0.3
>> microvolts sens?
>>
>>
>>
>> Thanks for your input John!
>>
>>
>>
>> Tim Hardy W7TRH / AFA0TP Wa.
>>
>>
>> ----- Original Message ----- 
>> From: Johnjewkes at aol.com
>> To: motorola at mailman.qth.net
>> Sent: Monday, November 16, 2009 3:39:34 PM GMT -08:00 US/Canada Pacific
>> Subject: Re: [Motorola] Astro Spectra VHF Range 2 to Range 1
>>
>> Hi Tim,
>> I use Spectra and Astro Spectra for Army MARS Freqs 143 & 150
>> with no problems. I have the RSS available via local National Guard unit
>> (Comm unit).
>> Changing the codes in the RSS fixes the band correctly (Hi or low split)
>> No noticeable variance in reception ( still 1-3 microvolts). JUST one
>> thing
>> though:
>> the heads are very easy to damage when changing out. Also, bad caps in 
>> the
>> unit
>> can cause a 'squish-squish-squish' noise in the background of
>> transmissions. Check
>> all the caps for proper values. Yes, some heads include scan function,
>> horn
>> alert on
>> receive or so forth... (One button simplex or repeat -They call simplex
>> 'Talkaround').
>>
>> You have to select on/off for these functions inside the RSS. Then you
>> save the file and
>> feed it in via the RIB into the midi-port (called a codeplug on the
>> radio). So long as the
>> unit is intact, it will read and write to the radio.
>>
>> 73 de John Jewkes, US ARMY MARS, Oregon/W6HNC
>>
>>
>> In a message dated 11/16/2009 1:03:11 P.M. Pacific Standard Time,
>> w7trh at comcast.net writes:
>>
>>
>>
>> Hello Folks,
>>
>>
>>
>> I am wondering how much hex editing is involved in moving a Astro Spectra
>> [VHF Hi Range 2] to [VHF Low Range 1]. If this can be accomplished, how
>> much does it affect rec. sens.? (This radio will be used on USAF MARS
>> 142-143
>> mHz)
>>
>>
>>
>> I have never done any hex editing......so if it is possible to lower 
>> range
>> of the Spectra [100 w trunk mount], I may ask for assistance with my
>> "Project".
>>
>>
>>
>> Also, I thought I read that if you change control head (ex. A9 to A5), 
>> you
>> had to do something in software. I realize that cables are the same.
>>
>>
>>
>> Thanks for any help you can provide!
>>
>>
>>
>> Tim Hardy
>>
>> W7TRH / AFA0TP
>>
>> Vashon Is. Wa.
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