> That's what I'm trying to figure out. What are those problems?
Probably the best place to start for issues with Signalink is:
http://www.frenning.dk/OZ1PIF_HOMEPAGE/SignaLinkUSB-mods.html
In general (at least in the case of the original units):
1) the Signalink design lacks a regulator for the V/2 bus that
provides both a reference for the CODEC and the audio op-amps.
The manufacturer of the CODEC (TI) calls for the V/2 regulator
in the product data sheet and extensive audio design experience
recommends regulation of the V/2 voltage in op amp circuits.
2) the Signalink is USB powered. However, the USB power is not
adequately filtered or decoupled placing digital noise from
the computer on the Signalink power bus (and coupling into
both transmit and receive signals).
3) the Signalink uses low quality audio isolation transformers
which create significant "tilt" across the passband
4) the Signalink internal PTT circuits require the CODEC output
be run wide open for reliable PTT action. At lower voltages
(and without regulation), the CODEC generates significant
distortion at maximum output.
5) the Signalink internal power distribution lacks proper by-pass
and decoupling resulting in both noise and audio crosstalk
distribution via the power circuits.
6) In spite of the use of transformers, the unit still appears
to be susceptible to a "pin 1 problem" and RF feedback -
probably due to a number of the previous problems and most
likely due to the lack of proper filtering/decoupling of the
USB power source.
> There's a fix in a recent QST (this summer) for one of them. W4TV
> identified another one.
The referenced fix (August, Hints & Kinks) addresses the lack of
regulation an noise to the Op Amps but not many of the other issues.
73,
... Joe, W4TV
On 2014-11-11 4:51 PM, Alan wrote:
> There's a fix in a recent QST (this summer) for one of them. W4TV
identified another one.
That's what I'm trying to figure out. What are those problems? Is
there any reason it wouldn't work fine with Winmore modulation format on
WinLink?
Alan N1AL
On 11/11/2014 12:57 PM, Jim Brown wrote:
On Tue,11/11/2014 11:41 AM, Alan wrote:
So what's the problem with the SignaLink?
There's a fix in a recent QST (this summer) for one of them. W4TV
identified another one. Several years ago, I saw a "fix" on the DX Eng
website that strongly suggested a Pin One Problem. And it's a single
channel device -- the ones I've recommended are two-channel (stereo),
so can be used for SO2R.
The SignaLink USB is the recommended sound card for Winmor on WinLink
2000:
http://www.dtreg.com/Getting_Started_with_Winlink_and_WINMOR.pdf
Lots of statements taken as gospel originate with people who are not
qualified to make them, and are repeated by others who are equally
unqualified to do so.
73, Jim K9YC
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