On 9/4/2017 11:12 PM, Jim Brown wrote:
> http://k9yc.com/USB_Interfaces.pdf
Since you specifically cite me: the output of a sound card is typically
1 Volt RMS or more.
A transceiver designed for use with a dynamic mic (Kenwood, TenTec,
Kenwood, etc.) typically expects 5 mV (or less) on the mic input. The
attenuation needed to reduce 1 V to 50 mV is 46 dB (20log(.005/1)).
Transceivers using electret mics (e.g., Icom), have a typical mic input
around 0.05 V RMS which implies the need for a 26 dB attenuator.
Note, the mic preamp stage of transceivers designed for an electret mic
typically has lower gain (~20 dB less) than those with dynamic mics are
are thus far less likely to be driven into clipping.
73,
... Joe, W4TV
On 9/4/2017 11:12 PM, Jim Brown wrote:
On 9/4/2017 5:05 PM, Barry wrote:
with digital modes for 2 reasons, they are inexpensive and they can
key your transmitter directly.
The only good reason I can think of for using the SignaLink is if that's
all you have and you can't afford to replace it. It is NOT a good audio
interface. More times than I can count, I've posted a link to my
recommendations for much better audio interfaces that are MUCH cheaper,
AND they're stereo. That means, for example, that with two VFOs or two
receivers, you can have two instances of WSJT-X running either copying
different frequencies or doing diversity reception! In addition to WSJT
modes, I use my stereo sound card to do SO2R SSB and RTTY contesting.
http://k9yc.com/USB_Interfaces.pdf
And as Don has noted, the SignaLink derives PTT from the audio stream by
a process known as VOX. :) Your rig can do that as well.
73, Jim K9YC
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