For the short period I had an HP 141T spectrum analyzer, I played
around with my noise gen a bit, and I was able to get a view showing
the noise of the N-Gen over a wide range, it looked like a fuzzy little
catarpillar, I should have taken a pic.
You should be able to test your N-Gen on any VHF radio including an FM
broadcast or aircraft reciever, any HF radio including some cheap
"shortwave", a Radio Shack Weather Cube, just about anything. The
signal shows on up a good oscilloscope but just barely, a radio is a
sensitive thing! 73 de Alex nS6y
On Jan 29, 2006, at 9:35 AM, Don Brown wrote:
Hi
You can use your K2 as a tester for the N-gen. Just use a probe made
up of
some RG58 connected to the antenna input of the K2 and install a small
capacitor (around .01) in series with the probe end. You can then
touch the
probe to the zener diode cathode. You should hear an increase in the
noise
level on the K2. If that is good then move on the the MMIC the output
there
should increase on the S-meter of the K2. The circuit is so simple it
just
about has to be the battery the zener diode or the MMIC in that order
Don Brown
----- Original Message -----
From: "Nick Waterman" <[EMAIL PROTECTED]>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: Sunday, January 29, 2006 11:23 AM
Subject: Re: [Elecraft] NGEN - is it working?
John D'Ausilio wrote:
Noise increase should be unmistakable. Make sure the MMIC isn't in
backwards :)
I was wondering if I'd mounted it "upside down", but as both the top
and
bottom leads are grounded, it looks as though, as long as the slanted
lead is towards the centre of the board, I can't realistically get it
wrong.
If you have a key attached and happened to transmit
into it, just order replacement MMIC (get 3, about $10 delivered :)
from Elecraft.
I'm an SSB guy, don't know CW YET. I don't have a key, I do have a PTT
switch, but only recently... Basically...
I built NGEN, XG1, DL1 without being able to test them. I built the K2
and had no PTT or key connected. I transmitted into DL1 for the
bandpass
filter tweaking, but did no other transmitting until after building
KSB2. I can be just about positive I've never transmitted into NGEN...
And even if I had, it definitely wouldn't have been the FIRST thing
I'd
done to it, and as far as I can tell, NGEN has never worked, or at
least
not noticably.
I'll try testing with AGC off, NGEN connected, and XG1 sat nearby on
the
bench so I have a signal to compare with my noise or lack thereof.
If it still doesn't work, can I be fairly confident that it's the
MMIC,
or might it be the Zenner D2? Or indeed anything else? There's no
"cheap
and dirty signal tracing" or table of voltages for NGEN, is there?
--
"Nosey" Nick Waterman, G7RZQ, K2 #5209.
use Std::Disclaimer; [EMAIL PROTECTED]
Half the people you know are below average.
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