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Re: [RTTY] SPOT:SV2ASP/A 18.107.6 RTTY

To: rtty@contesting.com
Subject: Re: [RTTY] SPOT:SV2ASP/A 18.107.6 RTTY
From: Mike Fatchett W0MU <w0mu@w0mu.com>
Date: Fri, 29 Apr 2011 18:13:05 -0600
List-post: <rtty@contesting.com">mailto:rtty@contesting.com>
Sounds like one of the DX Associations should be sending out a care 
package to Monk Apollo.

On 4/29/2011 6:01 PM, Michael Haack wrote:
> 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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