Is that a learning moment that says: Don't buy an ICOM?
73 David G3YYD
-----Original Message-----
From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of Jim W7RY
Sent: 27 October 2017 13:13
To: rtty@contesting.com; Joe Subich, W4TV
Subject: Re: [RTTY] Intel NUC, anyone?
Agreed Joe!
The Icom IC7300 is like this. I wish radio manufactures would allow AFSK
when in RTTY mode with a simple menu change.
There are ways to clean up an AFSK signal...
But then again.... You're selling interfaces!
73
Jim W7RY
-----Original Message-----
From: Joe Subich, W4TV
Sent: Thursday, October 26, 2017 5:59 PM
To: rtty@contesting.com
Subject: Re: [RTTY] Intel NUC, anyone?
> Another is that some rigs have transmit filters that are only usable
> in FSK mode
Actually, that is receive filters. Nearly all of the older Kenwood, Icom
and Yaesu rigs limited the narrow filter to "RTTY" (FSK) mode only. Icom
still limits its "twin peak" filter to RTTY only.
While many rigs are not as clean on FSK as they can be on AFSK, FSK is a
whole lot cleaner than many AFSK signals (particularly those with "Windows
noises", hum, clipping products from over driving the mic preamp, RFI due to
uncorrected common mode RF on the antenna leads, open ground connections,
audio from open microphones, etc. With FSK it is easier to generate a
"passable" signal for those who either do not care or don't know how to
generate a clean AFSK signal.
73,
... Joe, W4TV
On 10/26/2017 6:21 PM, iain macdonnell - N6ML wrote:
> On Thu, Oct 26, 2017 at 12:56 PM, Peter Laws <plaws0@gmail.com> wrote:
>> On Thu, Oct 26, 2017 at 2:14 PM, David G3YYD <g3yyd@btinternet.com>
wrote:
>>
>>> from FTDI. But why spend money on a box when you can just use AFSK
>>> for a very small sum in making your own sound card to rig lead.
>>
>>
>> Why do some hams use a straight key for CW? A there are any number
>> of keyers and interfaces that can produce perfectly timed CW using a
>> keyboard for input.
>
> That's kindof a weak argument. Sending CW with a straight-key is a
> skill (some would say an art). There's no special (operating) skill
> involved in FSK vs. AFSK.
>
> The usual argument for FSK is that you don't have to worry about
> getting the audio level right, and keeping the audio clean. Another is
> that some rigs have transmit filters that are only usable in FSK mode
> (IIUC).
>
> 73,
>
> ~iain / N6ML
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