[UK-CONTEST] interface problem

[David G3YYD]

We all have our views.

Using FSK is historic. AFSK is a much better proposition as it allows 
the TX frequency offset to be changed at any time to whatever frequency 
is required. It also when filtered by the generating software has a much 
narrower bandwidth occupancy compared to most FSK implementations. I 
often suffer from key clicks from those using FSK.

As for a TS2000 a design from at least  20 odd years ago and not very 
well designed for that matter.  I cannot understand why a designer would 
go to all that trouble and cost to put in narrow IF filters and not 
allow them to be used on SSB.

  I have used Drake C twins, FT1000MP and now K3. All of them allow 
narrow filter use on SSB. The best by far is the K3 with its dual 
passband filtering and specific AFSK configuration coupled with 
extraordinary receive performance. So beware fellow data contesters not 
a good idea to buy a TS2000 or for that matter any other rig that does 
not allow narrow filter use on SSB/AFSK mode.

David G3YYD

On 24/01/2011 12:28, Tom GM4FDM wrote:
> I concur
> use FSK when at all possible.
>
> Tom
> GM4FDM
>
> On 24/01/2011 09:34, Andy Swiffin wrote:
>>>>> On 22/01/2011 at 10:01, in message<4D3AAB07.2090700 at btinternet.com>, David
>> G3YYD<g3yyd at btinternet.com>   wrote:
>>> Roger
>>>
>>> Do you really need to use FSK?
>> Absolutely you do!!
>>
>>> It is better to use AFSK as this gives
>>> more operational flexibility and avoids the FSK problem.
>> Why more operational flexibility?    On my TS2000 I have some really nice filtering own to 250hz which I can use with FSK, whereas the SSB filtering is not that good up there (but fine for ssb)
>>
>> Why on earth use FSK with all its intermod and distortion problems when you can use a pair of pure carriers generated for the job.
>>
>>> However I know
>>> some rigs do not allow the narrow filters to be used with AFSK/SSB.
>>> (Please identify the rig to users if this is the case and they will know
>>> not to buy such a limited rig)
>> Not a limited rig,  just designed for people to use the correct method of generating each mode.    Does your rig do 1.8 MHz to 432 MHz tx?  Mine does,  really handy for flicking between 50 and 144 during auroras and sporadic E.
>>
>>> FSK/N1MM/MMTTY needs to use a dedicated serial port for the FSK shift.
>>> It cannot share the port with anything else. SK.
>> Not true.
>>
>> My g4zlp interface uses one USB to generate the port and the generated virtual port is shared between FSK CW  PTT.    EXTFSK expects you to be using the same port for ptt and fsk.
>>
>> I've already replied to Roger directly as it didn't seem worthwhile to send it here.   But I'll precis:  the pro+ works great using a single usb to generate all  the usual stuff, plus direct FSK.   You need the EXTFSK dll which comes with the mmtty distribution and when you pick the appropriate setting in mmtty this is automatically fired up.
>>
>> Sorry,  but I think saying to people to use AFSK when they have FSK easily available is really bad advice!!    I expect AFSK was responsible for some of the horrendous signals I heard around the bands  over last weekends contest.    You don't need to set it up badly, but many do!
>>
>>
>> Regards
>> Andy
>> gm8oeg
>>
>>
>>
>>
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