[Motorola] HT440 questions

[ersmar at comcast.net]

Eric:

     Thanks for the info on the charger model.  Now I know what to search for on that www thing.

     Regarding a stiff power supply for testing, I did in fact have a pretty good 12 V, 12 AH gelcell connected right at the battery contacts in the back of the chassis.  I had originally thought that the sound was low DC, but as I said, it disappeared when I disconnected the speaker/mike and listened to the unsquelched noise of the rx.  

     I just sent in payment for a shop manual for this radio from that www place.  I'll see if this type of symptom is mentioned in there.

     Thanks again for the hints.

73 de
Gene Smar  AD3F


 -------------- Original message ----------------------
From: "Eric Lemmon" <wb6fly at arrl.net>
> Gene,
> 
> The standard 3-hour desktop charger for the HT440 and its nearly identical
> twin HT90 is the NLN7646A.  The H34LCU radio uses a 12.5 VDC battery.
> 
> Regarding the motorboating, try connecting your power supply right at the
> battery contact springs, and ensure that the power supply has enough
> capacity to run the radio.  The symptom is not normal with a stiff power
> supply or a battery.
> 
> 73, Eric Lemmon WB6FLY
> 
> 
> -----Original Message-----
> From: motorola-bounces at mailman.qth.net
> [mailto:motorola-bounces at mailman.qth.net] On Behalf Of ersmar at comcast.net
> Sent: Thursday, September 21, 2006 12:23 PM
> To: motorola at mailman.qth.net
> Subject: [Motorola] HT440 questions
> 
> Gents:
> 
>      I just acquired a ^^ HT440 with speaker/mike and battery, all in 
> apparent good condition.  Two questions for you:
> 
> 1.     What is the proper charger I need for this rig's batt?  (Full model 
> number is H34LCU6124A.)
> 
> 2.    When I powered the unit from an external 12 VDC source via clip leads 
> to the chassis, I heard a motoboating sort of sound from the speaker/mike. 
> The sound disappeared when I removed the mike.  What might be the cause or 
> is this normal?
> 
>      Thanks for any help.
> 
> 73 de
> Gene Smar  AD3F
> 
> 
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