Watching a bandscope (I actually use CWSkimmer as it has good resolution) during
Rtty contests, proves Joe's comments. There are plenty of overdriven (multiple
harmonics of the audio tones, not just the low tones, but both tones at double
or
even triple shift, or even a 2.4khz wide wall of noise) signals on. Some have
so many
products it's hard to even find where they actually are transmitting. These
seem more
(to me) annoying than the wider than need be FSK guy parked next to me (at
least I know
where he is).
I keep hoping someone comes up with an easy to use occupied BW measurement
for RTTY signals like the IMD measure used for PSK31.
Mark. N2QT
> On Apr 1, 2015, at 10:18 AM, Joe Subich, W4TV <lists@subich.com> wrote:
>
>
>> I agree if you do all those things wrong. But intelligent people (and
>> Radio Amateurs must be intelligent to pass the exams) will avoid
>> those pitfalls.
>
> Even intelligent people can make mistakes or get sloppy. Witness the
> terrible AFSK signal from W1AW on 40 meters a couple years ago. They
> were doing everything right - AFSK to the modulator input of the Icom
> 756Pro, voltage divider, etc. - but the signal return lead broke and
> nobody noticed. That left extreme overdrive plus hum/buzz over 3+ KHz
> instead of 1 KHz like the "clicks" of the FT-1000 line.
>
> Given the number of "plug and pray" users out there with hardware that
> does not pay proper attention to power supply bypassing or regulating
> the CODEC/op amp reference voltages, those who do not take necessary
> care with common mode RFI issues, those who believe in "all knobs to
> the right," those who never got the memo about disabling any audio
> processing, etc., those who don't know to disable Windows Sounds or
> stop listening to their streaming media whilst operating, the number
> (chances) of really gross AFSK issues far exceeds the number of
> "clicky" signals from the FT-1000 family of rigs.
>
> If you're primarily a RTTY contest operator you may not hear those
> other signals and the FT-1000 family is still very popular with
> contesters so you will hear a higher percentage of FSK from that
> source. However, if you spend significant time with PSK and JT modes
> or listen to the pile-up of bigger DXpeditions, you will hear more
> really gross AFSK signals than wider than necessary FSK signals.
>
> Although I do not appreciate a "clicky" FT-1000MP 800 Hz away from me,
> it is far less objectionable than the overdriven IC-706mkIIG with
> processor cranked to the max, phase noise and carrier leakage.
>
> 73,
>
> ... Joe, W4TV
>
>
>> On 2015-04-01 5:17 AM, David G3YYD wrote:
>> Joe
>>
>> I agree if you do all those things wrong. But intelligent people (and Radio
>> Amateurs must be intelligent to pass the exams) will avoid those pitfalls.
>> Using AFSK takes up a lot less of the band than using Yaesu FSK, which is
>> like the Yaesu CW bandwidth very wide.
>>
>> I remember hearing about an FCC rule which says something along the lines
>> of: the transmission must occupy no more bandwidth than necessary for the
>> modulation type used and FT1000MP FSK for sure does not comply with that
>> rule.
>>
>> 73 David G3YYD
>>
>> -----Original Message-----
>> From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of Joe Subich,
>> W4TV
>> Sent: 31 March 2015 20:37
>> To: rtty@contesting.com
>> Subject: Re: [RTTY] Help for FT-1000-MP Mark V
>>
>>
>> > Or just use SSB with a resistive attenuator from the sound card to the >
>> microphone socket pin.
>>
>> Which does horrible things if you run the sound card level too high in the
>> PC or forget to turn off the compressor in the rig. The big benefit of PKT
>> in the Yaesu rigs is that it makes sure the compressor is off and the mic
>> preamp is bypassed so you do not cause clipping *before* the
>> mic gain control. It also avoids external switching that can fail and
>> introduce hum/distortion.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>>> On 2015-03-31 4:29 PM, David G3YYD wrote:
>>> Or just use SSB with a resistive attenuator from the sound card to the
>>> microphone socket pin. Did that for years on my old FT1KMP. Used a
>>> changeover switch to switch between microphone and attenuate audio
>>> from the PC.PTT was done by using VOX.
>>> 73 David G3YYD
>>>
>>> -----Original Message-----
>>> From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of Joe
>>> Subich, W4TV
>>> Sent: 31 March 2015 20:04
>>> To: rtty@contesting.com
>>> Subject: Re: [RTTY] Help for FT-1000-MP Mark V
>>>
>>>
>>>
>>>> My problem is understanding how you tell if her radio is set to AFSK
>>>> or FSK?
>>>
>>> RTTY-L and RTTY-U are FSK. To operate AFSK with any of the Yaesu
>>> transceivers one selects PKT mode. Prior to the FT-9000/FT-2000 PKT
>>> was restricted to LSB mode which makes in difficult to use in some
>>> digital modes (QPSK##, JT-65, JT9, MFSK#, etc.) but correct for AFSK
>>> RTTY and usable (with a display difference) for BPSK##.
>>>
>>> 73,
>>>
>>> ... Joe, W4TV
>>>
>>>
>>>> On 2015-03-30 11:44 PM, Gary AL9A wrote:
>>>> Looking for some insight into RTTY settings for the Mark V. I am
>>>> trying to help Corliss AL1G upgrade her RTTY setup, but am unfamiliar
>>>> with her radio. She is in Anchorage and I am about 45 road miles away
>>>> from her QTH so we are doing this via email and phone calls.
>>>>
>>>> She currently has a Rig Expert Standard as her interface, but is
>>>> going to upgrade to a microHAM MKII. She has MMTTY stand alone
>>>> running and we are trying to get her new upgraded version of WriteLog
>>>> to use either the MMTTY plug in or the XMMT.ocx. She has been
>>>> following the tips on AA5AU's web site, but she still is having
>>>> problems getting the radio to key up in WriteLog. At this point I am
>>>> unsure if she is transmitting AFSK or FSK.
>>>>
>>>> I downloaded the manual for the Mark V and scanned through it looking
>>>> for subjects that included RTTY, AFSK and FSK. I've discovered that
>>>> the Mark V has two jacks on the back of the radio related to RTTY. A
>>>> 5 pin DIN labeled PACKET is for AFSK, PSK and other digital modes. A
>>>> 4 pin DIN is for FSK. My problem is understanding how you tell if her
>>>> radio is set to AFSK or FSK? The manual says to push the RTTY button
>>>> on the radio to select either RTTY LSB or RTTY USB. That's it. So
>>>> is this AFSK or FSK? Because of the LSB/USB choices it sounds like
>>>> the radio is going to transmit AFSK with either of these settings
>>>> through
>>> the PACKET jack.
>>>> I can't find anything in the manual that specifically says how to set
>>>> it to do FSK. Is there a menu item buried somewhere that has to be
>>>> tweaked in order to get it to transmit FSK? Any guidance appreciated.
>>>>
>>>> 73,
>>>> Gary AL9A
>>>> _______________________________________________
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