Frequency Steps 5/10kHz as opposed to 12.5/25kHz
Neil Hosker
>How do I change my FT23R to tune in 5kHz/10kHz steps as opposed to
>12.5kHz/25kHz ?
>
>I asked Yaesu and they replied:
>> On the FT-23 there were 5 versions .Ver A,D and E have the 5 and 10 kHz
>> steps .The ver B and C have the 12.5 and 25 kHz steps. The steps are most
>> of the time able to be changed with jumper settings. I don't know what the
>> jumper setting are for either the USA ver or EUR ver.I don't have a radio
>> in house to open up to take a look at.
>
>I opened up my unit and the following pad configuration was noted:
>3 Open
>5 Open
>6 Open
>7 Open
>8 Open
>9 Closed
>10 Open
>
>Pads 7, 8, 9 change the frequency range and whether the radio operates in
>commercial (readout in channels) or amateur mode (readout in MHz). I have
>searched the Internet and found hundreds of frequency *range* mods but could
>not find any frequency *step* modifications.
>
>Can anyone provide the jumper setting or other information (perhaps someone
>with a 5/10kHz ft23r could look into their unit and report their jumper
>settings)?
>
>
I believe you need to change a reference crystal as well as fiddle with
the jumpers.....
--
Neil Hosker
* Reply to ne...@radioamateur.org.uk *
mike
working on it
reply soon
mike
"Neil Hosker" <ne...@radioamateur.org.uk> wrote in message
news:tHM5omOKhtj$Ew...@morgan2.demon.co.uk...
mike
my jpg file was rather small!
go here for the service manual ftp://80.164.5.88/yaesu-service/
then see image47 in the ft23r service manual file.
i have had one for almost 20yrs now, magic 'bullet proof' radio.
though i warn u...the mod needs the VCO unit removing!!
NOT easy.
mike
P.S sri agn to Nick.
"mike" <mike-...@nospam.co.uk> wrote in message
news:DGCjb.4194$mM1....@newsfep4-winn.server.ntli.net...
noone
> 1stly sorry Nick!!!...it is an xtal change as well!.
> my jpg file was rather small!
> go here for the service manual ftp://80.164.5.88/yaesu-service/
> then see image47 in the ft23r service manual file.
> i have had one for almost 20yrs now, magic 'bullet proof' radio.
> though i warn u...the mod needs the VCO unit removing!!
> NOT easy.
I looked at the .jpg file, it wasnt all that clear (resolution).
The crystal needs to be replaced from 12.8MHz to 10.24MHz? (guess - can you
verify?).
-> Guess based on following idea that the crystal will be pulled by the
trimmer capacitor hanging
-> at the end of it and squinting at the side comments on the service
manual:
-> 12.8MHz in ratio to 12.5MHz
-> 10.24MHz in ratio to 10MHz
Looks like I have to remove a lot to get to the main board (i.e. free it
from the case)
and then unsolder the PLL board (which is a right angles to it) before I can
unsolder/solder the bridges and perform the crystal replacement.
The ensure that the frequency is correct - by altering the trimmer and using
a frequency counter.
It does look a bit difficult.
Regards,
GW7ABW
Neil Hosker
<mike-...@nospam.co.uk> writes
>no u don't it is a jumper change
>working on it
>reply soon
>mike
>
I am curious to see what the outcome is. I have had a couple of the PMR
versions of those sets (basically the same as the FT23) and you can make
the display read in 5/10khz or 12.5/25khz steps by changing a jumper
(not sure which now) but to actually change its RF operation from one to
the other a reference crystal change was required.........
Regards
Neil