Re: [linuxham] Re: Odd behavior with IC-7200
- I wonder if you have insufficient audio drive level coming out of the computer.DaveK3DCW--Dave WrightK3DCWwww.k3dcw.net"Real radio bounces off the sky"
On Monday, February 18, 2013 at 8:42 PM, jhhaynes@... wrote:
Then I just tested with the Kachina radio and a different computer
and under Windows, just to make it as confusing as possible. In
PSK 31 I see a power output variation, but it is much more rapid and
much shallower than I see with the IC-7200.
- On Tue, 19 Feb 2013 01:42:21 -0000
> Then I just tested with the Kachina radio and a different computerThat sounds like a 2 tone test with a very small frequency difference
> and under Windows, just to make it as confusing as possible. In
> PSK 31 I see a power output variation, but it is much more rapid and
> much shallower than I see with the IC-7200.
causing a low beat frequency between the two tones. If each radio is
trying to transmit its own tone at a different level and with a
slightly different frequency due to oscillator tolerances then it could
explain what you're seeing.
- --- In email@example.com, jhhaynes@... wrote:
>Are you using the internal sound card or an external
> Wonder if anyone else has seen this.
> I was using fldigi and flrig under Linux. Transmitting PSK31
> I noticed the power output seemed to be oscillating with a period
> of about a second between 40 watts and some very low power.
sound card? If internal and if you built your
own cable and if you paralleled the right and left
channel output to the radio, make sure you do not
have right channel PTT enabled in the rig control
section. This is a lot of ifs but I did have it
happen to me. It's easy to see on a monitor scope
what is going on.
Probably not a solution but worth a look see.
73, Mike, K0TER
- Further testing seems to show that the power output from the radio
as indicated by its own indicator is fairly constant, while that
indicated by flrig is oscillating between the set output level and
a very low level. It doesn't depend on port audio versus pulse
audio. It doesn't depend on using flrig for rig control - I tried
switching to RigCAT, and with flrig running it shows the power
Also tried it with MultiPSK as the digital program, using the PTT
button on flrig to get it to transmit - same results.
Switched the baud rate from 19.2K to 9.6K and the oscillation is
still there but the depth of the oscillation is greatly diminished.
Changing to 4.8K doesn't appear much different from 9.6K
Conclusion - there's something funny about the way the radio reports
power related to the COM port speed. For now, 9600 baud is
preferable to 19.2K