----- Original Message -----
From: "Eric Webner" <[email protected]>
To: "Charles Ring" <[email protected]>
Cc: "Drake List" <[email protected]>
Sent: Monday, April 15, 2013 12:10 PM
Subject: Re: [Drakelist] Drake 2-C noise blanker
Charles,
A large part of it depends on whether your 2-C suffers from
the type of
noise (pulse type) that the noise blanker can help with. I
have bad power
line noise at my QTH that a blanker won't touch.
73,
Eric Webner K4FAN
The DStar FAN Club
On Apr 15, 2013 3:04 PM, "Charles Ring"
<[email protected]> wrote:
Is a schematic and parts list available for the 2NB? Any
possibility of
duplicating it? How well does it work, in other words
would it be worth the
effort?
.
73 de W3NU
Same here. I thought for a long time that the noise
blanker in my R4B didn't work. I tested it with a pulse
generator consisting of three 9 volt batteries in series, a
bug, and a 4 Hy choke. The blanker does not exactly remove
the pulses but knocks the effect on the AVC down by at least
20db. Its completely ineffective on power line noise such
as the hash from compact fluorescent lamps or defective
streetlights. A plain series clipper works to some extent
on those but is usually at the end of the IF chain, that is
at the detector, so does not prevent the noise from
actuating the AVC and desensitizing the receiver. At one
time ignition noise was a real problem and may still be for
mobile operation, but I never hear it at my house.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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