[Motorola] HT1250 / HT1550

[Eric Lemmon]

Compression and expansion may be used on a 2.5 kHz system to improve
fidelity, but never on a 5 kHz system.  The default pre- and de-emphasis is
always used, except in certain engineered systems where flat audio is needed
for linking.  Pre-emphasis is necessary for noise reduction, and its
companion de-emphasis must be used to return the audio to normal response.

73, Eric Lemmon WB6FLY
 

-----Original Message-----
From: motorola-bounces at mailman.qth.net
[mailto:motorola-bounces at mailman.qth.net] On Behalf Of K0DAN
Sent: Sunday, April 19, 2009 3:11 PM
To: Discussion of equipment manufactured by Motorola
Subject: Re: [Motorola] HT1250 / HT1550

Thanks for the tips, Eric, I will read the radios and see what we have.

Under what cases would compression/expansion be changed? Ditto for 
pre/de-emphasis?

73
Dan
K0DAN
----- Original Message ----- 
From: "Eric Lemmon" <wb6fly at verizon.net>
To: "'Discussion of equipment manufactured by Motorola'" 
<motorola at mailman.qth.net>
Sent: Sunday, April 19, 2009 4:41 PM
Subject: Re: [Motorola] HT1250 / HT1550


> Dan,
>
> Here are some default settings for a VHF HT1250.  Except as noted, all are
> the same for UHF.
>
> On the Microphone tab of the Radio Configuration menu, set microphone gain
> to 25.5 dB and accessory mike gain to 28.5 dB.
>
> For each personality, on the Basic tab, set channel bandwidth to 25 kHz 
> (20
> kHz for UHF)
>
> On the Advanced tab, set compression type and expansion type to disabled.
> For emphasis selection, select "de-emphasis & pre-emphasis"
> RX and TX Reference Frequency should be set at default.
>
> 73, Eric Lemmon WB6FLY
>
>
> -----Original Message-----
> From: motorola-bounces at mailman.qth.net
> [mailto:motorola-bounces at mailman.qth.net] On Behalf Of K0DAN
> Sent: Sunday, April 19, 2009 9:49 AM
> To: Discussion of equipment manufactured by Motorola
> Cc: wb6fly at verizon.net
> Subject: Re: [Motorola] HT1250 / HT1550
>
> Eric:
>
> Do you know if there's a standard procedure for setting (or defaults) the
> various audio compression menus? Trial & error seems risky. I assume all
> these variables are there to compensate for add-on audio accessories,
> ambient noise, etc. I have several 1250's, and their audio menu settings 
> are
>
> all over the place, and never changed by me. It'd be nice to standardize
> these, if practical. I think I have manuals on this model but don't recall
> seeing and guidelines for audio defaults/tweaking.
>
> Thanks & regards,
>
> Dan
> K0DAN
>
> ----- Original Message ----- 
> From: "Eric Lemmon" <wb6fly at verizon.net>
> To: "'Discussion of equipment manufactured by Motorola'"
> <motorola at mailman.qth.net>
> Sent: Saturday, April 18, 2009 7:17 PM
> Subject: Re: [Motorola] HT1250 / HT1550
>
>
>>
>> One very common cause of distorted audio is an incorrect setting of the
>> bandwidth.  If one radio transmits a 5 kHz signal, any radio set for 2.5
>> kHz
>> bandwidth will hear a very distorted  audio.  Check to ensure that all
>> radios in your system are programmed for the same bandwidth and audio
>> compression.  Also, check to ensure that the radios are programmed to the
>> correct frequencies.  If the programming is correct, it is possible that
>> the
>> speaker has been damaged.
>>
>> 73, Eric Lemmon WB6FLY
>>
>>
>> -----Original Message-----
>> From: israel1718 at aol.com [mailto:israel1718 at aol.com]
>> Sent: Saturday, April 18, 2009 4:55 PM
>> To: Eric Lemmon
>> Subject: Re: [Motorola] HT1250 / HT1550
>>
>> Maybe something else is wrong with mine, audio sounds very distorted
>> ------Original Message------
>> From: Eric Lemmon
>> To: israel1718 at aol.com
>> To: 'Discussion of equipment manufactured by Motorola'
>> Subject: RE: [Motorola] HT1250 / HT1550
>> Sent: Apr 18, 2009 19:28
>>
>> The HT1250 and HT1550 radios do not require tuning.  Both radios are
>> designed to operate over the entire band without adjustment.
>>
>> 73, Eric Lemmon WB6FLY
>>
>>
>> -----Original Message-----
>> From: motorola-bounces at mailman.qth.net
>> [mailto:motorola-bounces at mailman.qth.net] On Behalf Of israel1718 at aol.com
>> Sent: Saturday, April 18, 2009 4:06 PM
>> To: Motorola at mailman.qth.net
>> Subject: [Motorola] HT1250 / HT1550
>>
>> Anyone has any information or step by step instructions on what needs to
>> be
>> done to properly tune a ht1250 and ht1550 radio ?
>> What values need to be looked at and how.
>> Thanks
>> Sent from my BlackBerryR smartphone with SprintSpeed
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>>
>> Sent from my BlackBerryR smartphone with SprintSpeed
>
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