I had one and did the mod.
And that modification works.
While it limits you to 170 Hz shift on all modes, it does make a difference.
73 de Mike, WB9B
On 04/29/2011 1:51 PM, Joe Subich, W4TV wrote:
> AMTOR or not, the PK-232 was designed primarily for HF Packet and
> uses 200 Hz shift for both transmit and receive on HF. The modem is
> a typical 1980's filter/slicer for receive (multiple stages of op-
> amp based filters) and a PLL for transmit. "Nominal" HF tones are
> 2110/2310 Hz.
>
> There is a modification for the PK-232 that will convert it to
> 170 Hz (http://www.qsl.net/k0bx/align.htm). The modification
> involves replacing four resistors (in the receive filter) and
> aligning the AFSK generator for 170 Hz (to 2125/2295).
>
> 73,
>
> ... Joe, W4TV
>
>
> On 4/28/2011 11:29 PM, Kok Chen wrote:
>> On Apr 28, 2011, at 4:05 PM, Kok Chen wrote:
>>
>>> (the dreaded Amtor shift).
>> Whoops, sorry to disparage Amtor. I just remember that Amtor shift
>> isalso 170 Hz. It is HF Packet that uses 200 Hz shift.
>>
>> 73
>> Chen, W7AY
>>
>>
>>
>>
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