Hi, Jason--
Best guesses:
The tone you hear is the display counter circuitry. Usually any signal
coming in the antenna lead will be stronger than this. It is intermittent
because it switches on and off as the display updates.
Your description of the sound of the audio and the funky AGC sounds like a
dirty Notch filter pot.
I don't know if the audio CW filter came stock with the 580 Delta, but in my
two that is all I use except in horrible conditions. I'm a fan of the
Ten-Tec filters. Their 500 Hz filter for the 6.3 MHz IF is a good filter
for use in the 580 Delta.
73, Mike N4NT
----- Original Message -----
From: "Jason Reber" <jreber@sisna.com>
To: <tentec@contesting.com>
Sent: Saturday, October 09, 2004 1:16 PM
Subject: [TenTec] Delta 580 questions
Greetings;
I just picked up a Delta 580, and I really like the size and layout of
this rig. Hoewever, this unit has a few issues that I'm hoping someone
may have encountered before.
1st, there is a astable tone being generated whenever the VFO is set to
xx.046 MHz (USB or CW), or xx.050 LSB. The tone is about 1 KHz, and
alternates on and off at about 2Hz. Again, regardless of band, when the
VFO is set to 46 Khz (USB or CW), or 50Khz (LSB), this on/off tone
appears. It only persists for about 1 KHz either side of 46 Khz.
Something must be resonating on the back end, and coupling the tone into
the audio, but I'm perplexed as to why it's intermittent- on/off at
about 2Hz, and with a 50% duty cycle.
2nd, does anyone find that they need to switch the attenuator (rear
panel switch) in to get decent RX performance? If I don't switch it in,
I get extreme, brassy noise and poor AGC performance. I may just need to
check out the AGC circuit and look for problems, but I'd appreciate any
comments. The S-meter performance seems sluggish, and the audio seems
like its getting cut off below 500 Hz- very brassy, harsh audio. None of
the other TT rigs I've had (Omni D, Scout, Jupiter) have ever sounded
like this.
Finally, if anyones had a Delta with the crystal filter, would you
advise getting one (Inrad available, I think)?
Thanks for any comments or suggestions,
Jason AC7JW
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