No AGC means all stages in the chain (including the first mixer) have to cope
with
a dynamic range of 130 dB (in a proper receiver).
The only remedy is proper filtering as early in the chain as possible, with a
carefully
designed AGC system..
Some 25 years ago Ulrich Rohde has writtien some
Skip makes a good point. Passband tuning and IF shift are effective in
dealing with AGC capture.
In some cases I have added attenuation in to the receiver as an additional
measure to reduce front-end overload.
philw de ka1gmn
On Tue, Jun 16, 2009 at 9:27 AM, kh6ty wrote:
>
>
> Frank, often the
I'm QRV on 50.300 for a few hours mode is RTTY EM12px
Russell NC5O
Yesterday is HISTORY. Tomorrow is a MYSTERY. Today is a GIFT! Thats why its
called the PRESENT!
" IN GOD WE TRUST "
Russell Blair (NC5O)
Skype-Russell.Blair
Hell Field #300
DRCC #55
30m Dig-group #693
Hi,
Quite simple: I'll explain offline to yourself and Dave W1HKJ very soon.
Simon Brown, HB9DRV
www.ham-radio-deluxe.com
- Original Message -
From: "Vojtech Bubnik"
> Hi Simon.
> The enhancement looks very interesting. How do you do that?
> BTW, I was trying to achieve nice CW water
I also find that using a combination of narrow filters and passband
tuning helps dig out the weak ones in the presence of strong stations.
I've been using an IC-7200 for the past few months. It's Twin Passband
Tuning feature of the DSP lets you electronically narrow the IF
passband. Very useful
Frank, often the loss of a weak signal in the presence of a strong one
is due to AGC capture by the strong station, which reduces the gain you
need for the weak one. Try using passband tuning or IF shift to reduce
the presence of the strong station in the passband so the AGC will not
be affecte
Hi Simon.
The enhancement looks very interesting. How do you do that?
BTW, I was trying to achieve nice CW waterfall like in Rocky, but I did not
succeed. Your method looks promissing.
73, Vojtech
--- In digitalradio@yahoogroups.com, "Simon \(HB9DRV\)" wrote:
>
> What I am seeing is PSK users c
Hi,
Keep an eye out for a second-hand 480SAT - I've heard of them going for ~
$500.
Simon Brown, HB9DRV
www.ham-radio-deluxe.com
- Original Message -
From: "frankk2ncc"
>
> The 480SAT is certainly a fine rig, as Rob, AA6A would attest, but another
> rig is about 1000$ behind getting
--- In digitalradio@yahoogroups.com, "Simon \(HB9DRV\)" wrote:
> Being as fair as I can I suggest that this is not an over-driven signal...
Yeah, I figure most signals I see, particularly PSK, aren't over driven, as the
trace looks clean, but my rig's notch capability isn't what I'd like. The
Being as fair as I can I suggest that this is not an over-driven signal,
he's just strong. DM780 5.0's enhancement option will really help as would a
500Hz filter in the 450 if possible.
If you're thinking about a new radio look at the TS-480SAT - IMO the best
digital-mode radio.
Simon Brown,
--- In digitalradio@yahoogroups.com, "Simon \(HB9DRV\)" wrote:
> If someone is suffering from strong signals I would want to know what radio
> and soundcard he's using, also a screenshot of the waterfall can help.
Simon, is this a good example?
http://forums.ham-radio.ch/attachment.php?attachme
What I am seeing is PSK users climbing about 14.073 to get away from the
pack - this is what I would do. I don't see anyone using more than 50W on
PSK and a decent QRP radio such as the IC-703 shouldn't have much of a
problem, especially when using a 500Hz filter.
The soundcard also plays a rol
A good concept. Looking though the web searches, there's some feedback to that
point. However, where you suggest would put you up with some other offenders,
particularly RTTY. I don't think it matters where you go, you'll still get
stomped on if your QRP.
If folks would just lower their powe
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