Im in the middle of the RTTY RU and running great. Regarding the IMD
in PSK I got the following results as noted below....
Begin forwarded message:
From: Gregory Fischer <a...@cablespeed.com>
Date: January 2, 2009 9:16:33 PM PST
To: Wayne Burdick <n...@elecraft.com>, Lyle Johnson <k...@wavecable.com
>
Subject: Re: [Elecraft] Re: Distorted TX audio with RTTY decode
enabled
Notes using the IMD Meter:
PWR Set ALC bars Line Out Actual Pwr IMD
10 0 3
9 -32
10 2(flash) 4 12.2 -27
10 5 5 12.6
-26
40 0 3
30 -32
40 2 flashing 4 59 -32
40 5 5
59 -31
100 0 3
80 -32
100 2 flashing 4 121 -28
100 5 5 123
-28
This was into a resonant antenna (1.2:1) and sending a PSK idle at
1000 Hz. After the above test I tried to really over drive it
increasing the Line In level to 15 and the worse IMD I could create
was -26. My soundcard output was only at about 10%.
I've also been listening for this ticking sound that was reported
using AFSK...suposedly with the decoder on. I just don't hear it.
I have my headphones on with the noise cancelling turned on so I
don't hear any crap in the shack. I tried at different power levels
and do not hear it. I had a quick qso on 40M with someone and asked
if they could hear any ticking sound and they said I sounded clean.
Testing done with McU 2.77/DSP 1.98
Greg
On Jan 2, 2009, at 10:04 AM, wayne burdick wrote:
Lyle and I will team up on this as soon as possible.
tnx
Wayne
N6KR
On Jan 2, 2009, at 5:31 AM, k...@verizon.net wrote:
With the K3's RTTY decoder function enabled so it displays running
text on the front panel, intermittent distortion is introduced
into the TX AFSK audio...
---
http://www.elecraft.com
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