Does the Corsair II have an internal keyer?
Joe wrote:
>I agree Paul, if 2 or 3 bucks is important to you, then the Twin-T is the
>way to go. I agree, it is a more complex solution. The hardware might be
>slightly more complex, but I would venture a guess that the DDS solution has
>fewer parts once the keying and interface components are added to the
>Twin-T. The firmware is complex, but is available at not cost. If you want
>to hear the artifact of the Corsair II's QSK, just disable the sidetone and
>hit the key. You will hear the thump. It is not related to any sidetone
>implementation.
>
>I think the DDS solution is better. While the Twin-T gives a nice sine wave,
>my observation of both on the oscilloscope shows less distortion in the DDS
>sine wave. It also has more output. The waveform is much better with the
>DDS. Why? 1) When keyed, the DDS always begins and ends at zero phase where
>as the Twin-T begins and ends at random phase. That makes for better keying
>waveform. 2) The audio envelope shape is much better also because amplitude
>weighting of the leading and trailing edges is accomplished in firmware by
>starting at -18 dB (relative to the max amplitude) on the leading edge and
>increased in 3db steps, each increase being applied at zero phase. The
>trailing edge is shaped in like manner.
>
>I have the DDS circuit in my Corsair II and I am very pleased with it. I was
>not pleased with the Twin-T, but it was much better than the original. I
>also have the DDS circuit in a code practice oscillator. It is the best
>sounding one that I have ever heard.
>
>Joe, N4YG
>----- Original Message -----
>From: "Paul Christensen" <w9ac@arrl.net>
>To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>Sent: Saturday, October 15, 2011 5:04 PM
>Subject: Re: [TenTec] Corsair II sidetone mod
>
>
>
>
>>Darn, for a small fraction of the circuit complexity and cost, the Twin-T
>>oscillator can be used. I noticed that Joe, N4YG tried the Twin-T on his
>>Corsair II but stated that he "...could never get smooth keying..."
>>
>>Ten years ago, N4LQ suggested that I try a frequency-variable Twin-T,
>>stolen
>>direct from the Omni V schematic diagram.
>>
>>http://www.qsl.net/tentec/mods/sidetone.pdf
>>
>>N4LQ applied it to one of his Omni D transceivers and I used it in a
>>Triton
>>IV. Neither of us heard the slightest trace of a QSK artifact. Anyway, I
>>would first try the Twin-T as implemented by Ten Tec in the Omni V, then
>>explore the more complex alternative option if not satisfied.
>>
>>Paul, W9AC
>>
>>----- Original Message -----
>>From: "Steve Hunt" <steve@karinya.net>
>>To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>>Sent: Saturday, October 15, 2011 5:45 PM
>>Subject: Re: [TenTec] Corsair II sidetone mod
>>
>>
>>
>>
>>>Jerry,
>>>
>>>You would certainly get two of those boards within ExpressPCB's
>>>MiniBoardPro outline - maybe more. That option gives you 3 boards - and
>>>therefore at least 6 sidetone boards - for $75 plus delivery.
>>>
>>>73,
>>>Steve G3TXQ
>>>
>>>On 15/10/2011 22:23, Jerry Haigwood wrote:
>>>
>>>
>>>>Glenn,
>>>> I guess it would depend on how many people were interested. To
>>>>keep
>>>>board prices down, you need to sell 50 or so PCBs. The board would be
>>>>small
>>>>- maybe 1.5 inch x 1.5 inch and the cost of the parts should be low
>>>>also.
>>>>Just depends on how many people would want a board or kit.
>>>>Jerry W5JH
>>>>
>>>>-----Original Message-----
>>>>From: tentec-bounces@contesting.com
>>>>[mailto:tentec-bounces@contesting.com]
>>>>On Behalf Of Glenn
>>>>Sent: Saturday, October 15, 2011 3:34 PM
>>>>To: tentec@contesting.com
>>>>Subject: Re: [TenTec] Corsair II sidetone mod
>>>>
>>>>Wonder if Jerry would be interested in building some boards..Just a
>>>>thought.
>>>>
>>>>
>>>>Glenn WA4AOS
>>>>DSM Labs
>>>>
>>>>
>>>>
>>>>-----Original Message-----
>>>>From: Barry N1EU<barry.n1eu@gmail.com>
>>>>To: Discussion of Ten-Tec Equipment<tentec@contesting.com>
>>>>Sent: Sat, Oct 15, 2011 11:54 am
>>>>Subject: [TenTec] Corsair II sidetone mod
>>>>
>>>>
>>>>N4YG developed a nifty and elegant sine wave sidetone mod for the
>>>>Corsair II. I posted all the info with Joe's approval at:
>>>>http://corsair.wikidot.com/corsair-sidetone
>>>>
>>>>Joe is on this reflector, so any comments/questions can probably be
>>>>directed here.
>>>>
>>>>73,
>>>>Barry N1EU
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>>>>
>>>>
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>
>
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