[Fwd: Re: [Elecraft] NZ7C: Setting up a "lab" (off-topic)]

[Tim and Nancy Logan]

Gadzooks - this response surprized me!    Especially the reference to
Problem 34. 73/Tim

-------- Original Message --------
Subject: Re: [Elecraft] NZ7C: Setting up a "lab" (off-topic)
Date: Sun, 7 Apr 2002 11:33:28 -0500
From: "Don Brown" <DolfinDon@msn.com>
To: "Elecraft" <elecraft@mailman.qth.net>

Good luck!! The function generator you specified won't even do all of
this. I would guess you would need over $10000 worth of new equipment to
do all of the listed requirements.  

Remember when it comes to test equipment you have Good, Fast and Cheap -
pick any two!

You have a great scope I have a 475 on my bench. I have a Tektronix
CFG-253 function generator that will do some, but nowhere near all of
the requirements you listed. It was about $700 if I remember right and
may be available used or surplus.

I would look for some of the new, used or surplus function generators
and adapt the lesson to the capability of the generator. For instance if
you need to look at a modulation envelope it doesn't really mater what
the frequencies are for instruction purposes. You may just have to skip
some of the lab tests for example  

Problem 34 very few generators could generate a signal this low without
leakage.  

Problem 14 - function generators with 1 hertz resolution are not cheap -
even used or surplus

Don Brown
KD5NDB

----- Original Message -----
From: Tim and Nancy Logan
Sent: Sunday, April 07, 2002 10:43 AM
To: Elecraft
Subject: [Elecraft] NZ7C: Setting up a "lab" (off-topic)

Hi everyone - hope this off-topic question is OK....

In an earlier post I mentioned that I got a Norcal 40A kit and David
Rutledge's The Electronics of Radio which uses the Norcal for the
"practical lab". To use this self-teaching tool well, you need some
equipment. Thanks to the Elecraft crowd I've solved the Oscilliscope
component by getting a Tektronics 465M for $110. It will have the manual
and arrives tomorrow :-)

The study also requires a frequency generator and mentions the HP 33120A
15MHz function generator. Well, this little baby is $1700 new. Dah, I
don't THINK so folks - I'm more interested in something like $50 used.
I've summarized the typical uses the "lab work"  demands of the function
generator by the book's Problem Numbers.

Knowing that this is what is required, can anyone suggest a piece of
equipment that would meet my needs and could be had very cheaply? Thanks
again.

Problem 3A: set for 20Hz, 1Vpp square wave
Problem 4: 1MHz, 5Vpp sine wave with modulation depth of 70% - need a
synch output connected to the oscilloscope.

Problem 5: 1kHz, 5Vpp square wave    vary 100kHz to 30kHz and 100mVpp
Problem 10: set for %V pulses with 5ns width that repeat at a feq of
20kHz
Problem 13: 7MHz to 28MHz,10Vpp
Problem 14: Set to 4,913,500 Hz sine wave with .5Vpp amplitude. Must be
able to change feq in 1Hz steps

Problem 15: 7MHz sine wave, 5Vpp
Problem 17: 600Hz sine wave, 25mVrms
Problem 19: 1kHz square wave (50 ohm function generator set to 4Vpp with
DC offset of 2V)
Problem 20: 20Hz square wave; 5Vpp
Problem 21: 7MHz sine wave, 2V with .5V offset
Problem 34 input power of 100fW at freq between 7020 - 7030kHz and
ability to create noise (-30dBm in this case


Thanks folks - 73/Tim Logan NZ7C


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