[TheList] T500 TX issue

Sat Mar 20 15:58:51 AEDT 2010

Hey Neill thanks for the reply,

Yeah mate, was pretty surprised myself haha.  Was more a spur of the 
moment purchase than anything in all honesty...

I have set the pot for 4.25V, its extremely touchy so thats probably as 
close as I might get.  Unfortunately I don't know how to 'peak'  a 
receiver,  sounds technical haha.

Also, that VHF t500 is going extremely well, since you looked at it.  
Hasn't missed a beat since!!

  Richard

On 20/03/2010 5:00 p.m., Neill Ellis wrote:
> LOL, Vote or scan mode in a T500 :o)
>
> A brand new T500? That's sad, that unit is 20+ year old technology now 
> and the stopped production well over 10 years ago.
>
> the T550 or T555 UHF versions can only do 12.5 kHz steps, so they 
> can't receive new narrow simplex channels and can't transmit on new 
> narrow repeater input frequencies.
>
> You not only need to clip the diodes, it will also need alignment. 
> There are three vertical pins between the die cast VCO can on the PCB 
> and the diode matrix PCB. Measure the voltage on the center pin 
> relative to ground. You need to adjust the VCO for 4 volts on a single 
> channel. On Multi channels try to keep the voltage close to 4 volts 
> but not outside the 1 and 7.5V range if it varies a lot. Of course 
> you'll then need to peak the receiver too.
>
> Regards,
>
> Neill.
>
>
> Shane V wrote:
>> You may be seeing one of the LO's ramping if the unit is in vote or scan
>> mode...
>>
>> -----Original Message-----
>> From: thelist-bounces at radiowiki.org.nz
>> [mailto:thelist-bounces at radiowiki.org.nz] On Behalf Of Z-master
>> Sent: Saturday, 20 March 2010 3:02 p.m.
>> To: thelist at radiowiki.org.nz
>> Subject: Re: [TheList] T500 TX issue
>>
>> Sorry team,  stand down.  Seems the units giving out interference 
>> that I was picking up, it wasn't TXing at all (thankfully)
>>
>> Unit still won't RX frequencies so might take it in and get it checked.
>>
>> But to answer your other question, it shouldn't be TXing at all as 
>> i've only snipped the RX1 and 2 diodes.
>>
>> Cheers
>>
>>
>>
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