[Elecraft] Why Not Remove the Birdies Through a Firmware Update

Mon Apr 26 00:55:34 EDT 2010

Guy, Thanks for that clarification. I didn't realize that every K3 has different birdies. I will try to move the wires around as some suggested. 

Date: Sun, 25 Apr 2010 09:41:19 -0700
From: ml-node+4958998-702008143-44883 at n2.nabble.com
To: connectmenow at hotmail.com
Subject: Re: Why Not Remove the Birdies Through a Firmware Update

The firmware does allow you to take out birdies.

What you are suggesting is that the birdies are all the same for all

K3's, and the list could be populated in advance by Elecraft.  This is

not true due to normal manufacturing variation in component values,

which are used as is, and their small variation in values compensated

for by digital "ranging" in the firmware.

In a manner of speaking the combination of these "ranges" in a given

K3 is like a fingerprint, making each k3's collection of birdies

unique.

It is theoretically possible to have firmware/utilityware do a scan

with the RX inputs terminated, but I can guarantee that is a nasty

software app, and couldn't be done in Wayne's spare time over a

weekend. A birdie killer app would be neat, but.....

I have exactly three that bother me, all in the main RX, and I have

eliminated them with the firmware provision.

There are a lot of weak birdies that I can hear with open antenna

jacks that go away somewhere when I put a working well matched antenna

on it.  I suspect that is because unterminated pieces of internal coax

behave differently, but that is just a gut lurch. Then there is

ambient noise, which I have here even on ten meters.

I would have ambient noise on 6m if I had the preamp.  Practically,

birdies have to be really loud to be an issue 20m and down. One night

it occurred to me, that do I really care if I can hear a birdie on a

dead band? Is there even a microscopic chance I would send it back

because of a birdie that I could eliminate by taking the time to table

up one at a time with a firmware routine.

Then it struck me that since I didn't care enough to do that, that I

didn't care that much and didn't have even a microscopic chance of

sending it back.

If I was a six meter guy, I'd probably do the work on 6m. Takes a

preamp to hear the ambient noise.

73, Guy.

On Sun, Apr 25, 2010 at 3:31 AM, -.-.  --.-N3TU -.-.  --.-

<[hidden email]> wrote:

>

> Wouldn't that be easier. Take a pole of all the birdies and take it out with

> firmware.

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