date:20071130

Re: [Elecraft] OT - American hamming in UK

2007-11-30 Thread David Ferrington, M0XDF

You can still purchase in the UK, my rolls came from 'ScrewFix'


On 1/12/07 01:33, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> sent:

> In a message dated 11/30/07 7:36:09 PM Eastern Standard Time,
> [EMAIL PROTECTED] writes:
> 
> 
>> It was 18 AWG solid copper wire with a cotton covering,
>>   usually white with a colored stripe, and was widely used to
>>   hook up ...bells, what else!
>> 
> 
> I still have a roll.
> 
> No, it's not for sale.
> 
> 73 de Jim, N2EY, WCP (World Class Packrat)

-- 
Extraordinary claims require extraordinary evidence.
-Carl Sagan, astronomer and author (1934-1996)


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RE: [Elecraft] K3 ease of use

2007-11-30 Thread Edward Dickinson, III

Like Dale, I'd like to hear about K3 'ease of use' and perhaps the 'learning
slope.'  My current radios don't work me very hard.  


Regards,
Dick - KA5KKT/4 

-Original Message-

Anybody have comments on how easy the K3 is to use.  I see a lot of  
dual function buttons and controls.  How about a comparison to the  
Icom Pro 3 as for ease of using the controls and operating the  
features of this radio.

I also own a Kenwood TS2000, it has a multitude of dual function  
buttons and controls.  I find it somewhat clumsy to use at times.   
Again, any comparisons?

Dale, K9VUJ

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Re: [Elecraft] K2 suddenly stops RX while on 160

2007-11-30 Thread Steve Jackson

Don

Yes, it really does 'fade out' - but it does so pretty quickly, like, in 5 
seconds or less.  Kind of neat,
actually, it would be hard to design a circuit that does this on purpose!

Any band change or power cycle brings it back, and, it even comes back all by 
itself, after a while.

The RX is still 'on' ... although I don't know what it's listening to.  Seems 
like it's actually going to some
out-of-band frequency and staying there, as if the varactor in the master VFO 
became impotent.  I hear
the AGC pumping, as if there was a clicky Brand-Y running a gallon up the band 
a bit.

I guess I will have a look-see in the morning.  I wanted to get a few more 
multipliers tonight.  Too
tired to work on radios now.  Gee ... never thought I'd ever say that ... must 
be age.  Or wisdom.

I'll post here what I find when I find it.  -gn-

73 Steve KZ1X/4



  

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RE: [Elecraft] K3 filters

2007-11-30 Thread Ron D'Eau Claire

Oops I meant to say:

"Ringing is a function of the bandwidth and only SLIGHTLY affected by the
type of filter."

-Original Message-
From: Ron D'Eau Claire [mailto:[EMAIL PROTECTED] 
Sent: Friday, November 30, 2007 8:52 PM
To: 'elecraft@mailman.qth.net'
Subject: RE: [Elecraft] K3 filters

Any filter will produce "ringing" when the bandwidth is too small. 

Ringing is a function of the bandwidth and only affected by the type of
filter. In some filter designs it's possible for some elements of the filter
to have such a high Q they ring even though the overall filter bandpass is
not that small, but that's a aberration in the filter design. 

Ringing typically occurs when the bandwidth at either the transmitter or
receiver is restricted too much to allow the CW sidebands to pass through.

Of course, the sidebands on a CW signal are the frequencies represented by
the rise and fall of each CW element. If the bandwidth isn't sufficient to
pass them, the element is stretched out in time as the amplitude decays,
just like the amplitude of a bell decays after the bell was stuck. That's
what we call "ringing". 

Ron AC7AC

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Alan Bloom
Sent: Friday, November 30, 2007 1:47 PM
To: Darwin, Keith
Cc: elecraft@mailman.qth.net
Subject: RE: [Elecraft] K3 filters

For the same passband ripple and bandwidth I think more poles pretty much
invariably means more ringing.

By the way, many people think that DSP-based filters don't ring. 
Actually, a digital filter's impulse response, measured at say the
half-power point, is pretty comparable to an analog (e.g. cyrstal) filter
with the same ripple and bandwidth.  However, the ringing from a digital FIR
(finite impulse response) filter eventually drops all the way to zero, while
an IIR (e.g. analog) filter theoretically rings forever.  Since human sound
perception tends to be logarithmic, the ringing _sounds_ longer with the
analog filter.

Al N1AL

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RE: [Elecraft] K3 filters

2007-11-30 Thread Ron D'Eau Claire

Any filter will produce "ringing" when the bandwidth is too small. 

Ringing is a function of the bandwidth and only affected by the type of
filter. In some filter designs it's possible for some elements of the filter
to have such a high Q they ring even though the overall filter bandpass is
not that small, but that's a aberration in the filter design. 

Ringing typically occurs when the bandwidth at either the transmitter or
receiver is restricted too much to allow the CW sidebands to pass through.

Of course, the sidebands on a CW signal are the frequencies represented by
the rise and fall of each CW element. If the bandwidth isn't sufficient to
pass them, the element is stretched out in time as the amplitude decays,
just like the amplitude of a bell decays after the bell was stuck. That's
what we call "ringing". 

Ron AC7AC

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Alan Bloom
Sent: Friday, November 30, 2007 1:47 PM
To: Darwin, Keith
Cc: elecraft@mailman.qth.net
Subject: RE: [Elecraft] K3 filters


For the same passband ripple and bandwidth I think more poles pretty much
invariably means more ringing.

By the way, many people think that DSP-based filters don't ring. 
Actually, a digital filter's impulse response, measured at say the
half-power point, is pretty comparable to an analog (e.g. cyrstal) filter
with the same ripple and bandwidth.  However, the ringing from a digital FIR
(finite impulse response) filter eventually drops all the way to zero, while
an IIR (e.g. analog) filter theoretically rings forever.  Since human sound
perception tends to be logarithmic, the ringing _sounds_ longer with the
analog filter.

Al N1AL


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Re: [Elecraft] K2 suddenly stops RX while on 160

2007-11-30 Thread Don Wilhelm

Steve,

I have not seen anything that I would term 'fading out', but --

One of the first things I would do is to check the frequency of the VCO
while it is failing.
That can be easily done without dragging out your counter, just put the
internal probe in TP1 and use CAL FCTR - compare with the chart on the
Schematic Key page.

Right now I can't think of anything else that would cause a problem like
that. I guess it might be a relay contact that develops resistance that
builds up until failure, but that would be a rare occurrence.

Since both transmit and receive fail, that points to something common -
the oscillators, the bandpass filter or the low pass filter - most other
things are not common to transmit and receive.

73,
Don W3FPR

Steve Jackson wrote:
Gee, it's been almost eight years of nearly continuous, flawless operation!

But my K2 --just now-- decided to stop working on 160.

I was doing a little S&P, looking for mults in the contest, and all of a sudden, the receiver stopped working.

Doesn't transmit, either.

It's fine on other bands, and comes back for a few minutes when I power-cycle
the radio, or when I change bands
momentarily. Then it quits again, after a minute or so. Just sort of fades
out.

VFO shows it's trying to tune while it's out to lunch, but nothing happens.

Of course, I can fix it, but before I go and start, anybody else ever see this
happen?

tnx

Steve KZ1X/4
owner of the World's Most Experienced Elecraft
... which seems right now to be wanting a siesta

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