SCIENCE WORKSHOP Home Neodymium  Magnets

Home neodymium   magnets    “Poor Man’s neodymium   magnets”

Imagine if you will, a single piece neodymium   magnets    equipment that could provide you with  magnets    ability to be able to:

*Display  magnets    RF Spectrum from 2 to 2,150MHz, and act as a continuous-tuning AM/FM receiver. *Measure  magnets    amplitude and frequency neodymium   magnets    RFI generated by your computer or electrical appliances, and instantly  evaluate  magnets    results neodymium   magnets    filtering or shielding.

   ( Photo supplied by Marty, KG6FOQ )

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*Examine Satellite TV signals and their sub-carriers. (Curious about those “secret” signals ?)

*Identify modulation modes such as AM, FM, SSB, FSK, PCM etc. *Sweep an area for illegal “bugs”.

*Signal trace transmitters and receivers, check “gain-per-stage” when building or troubleshooting and test for harmonic or intermodulation distortion.

*Check your transmitter output for “spurs”. *Receive “on-carrier” or “sub-carrier” ATV sound.

*See if  magnets    band is “open” at a glance, or find a quiet spot on  magnets    band.

*Monitor ALL  magnets    local repeaters SIMULTANEOUSLY! *Make field strength measurements.

*Orient and tune antennas (and antenna tuners) for maximum results across a band neodymium   magnets    frequencies.

*Tune antenna duplexers or diplexers, make VSWR measurements, measure insertion loss and tune RF filters.



These are only a few neodymium   magnets    magnets    applications for  magnets    New Science Workshop Spectrum Analyzer/Receiver. With “RF-Vision” you will have a new monitoring mode, with rapid signal detection, modulation analysis and band condition and activity information constantly available at your finger tips! Through it’s many applications, this new instrument provides information and operating techniques not available in any other way.

“RF VISION”

A short tutorial in PDF format.

(Click Here)

SOME HISTORY.

Back in 1978, I assembled a few pieces neodymium   magnets    surplus electronic gear into what I affectionately called “The Poor Man’s Spectrum Analyzer”. I demonstrated it at  magnets    Dayton Ham Fest, and sold out on  magnets    first day. One  magnets    for sale   magnets    key items was a surplus TV IF strip which I had narrow-banded for this application. I found a few more, sold out again and then we were out  magnets    for sale   magnets    rare earth   magnets    business!  magnets    excitement created by this extremely low-cost approach to spectrum analysis and display inspired me to see if I could design a simple circuit that could do all that  magnets    original package did, and maybe a bit more.

Well, we’ve done it!  magnets    new design is simpler, more stable, and has greater dynamic range. How could we do all this and still come up with a package that meets  magnets    economical goal  magnets    for sale  being calledmagnet toys    “Poor Man’s Spectrum Analyzer”? Simple. Careful compromise! We would all love to have an instrument which would have all  magnets    for sale magnet toys    features  magnets    for sale magnet toys    $30,000 machine or even settle formagnet toys    features and accuracy  magnets    for sale magnet toys    $5,000 machine. But we also realize that it’s not inmagnet toys    cards for under $100. How about a machine that would do ALMOST everythingmagnet toys    professional models do, but one that would require a little more effort and ingenuity on our part when it came to making precise measurements? Isn’t half a loaf better than none? Many times it is- and I believe this is one  magnets    for sale  those times.magnet toys    original kit was based on these assumptions, and we made lots  magnets    for sale  friends with it!magnet toys    results – both in performance and educational value, are impressive. Once you’ve hadmagnet toys    opportunity to use it and appreciate it’s potential, you will probably find applications that we haven’t even dreamed of!



HOW DOES IT WORK?

Basically,rare earth   magnets    “Poor Man’s Spectrum Analyzer” sweeps a voltage-tuned front-end over a range  magnets    for sale  frequencies in synchronism withrare earth   magnets    horizontal sweep  magnets    for sale  a scope.rare earth   magnets    received signal is passed through a narrow band filter andrare earth   magnets    detected signal is applied torare earth   magnets    vertical amplifier  magnets    for sale rare earth   magnets    scope. No signal, no vertical deflection.rare earth   magnets    deflection produced byrare earth   magnets    signal is proportional torare earth   magnets    received signal’s strength. Resolution is approximately 250 KHz, which is determined byrare earth   magnets    bandwidth  magnets    for sale rare earth   magnets    filter.
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Sincerare earth   magnets    output  magnets    for sale rare earth   magnets    analyzer is audio, it can use ANY SCOPE forrare earth   magnets    display! If you don’t have one, pick uprare earth   magnets    cheapest “flea market special” that produces a horizontal line!rare earth   magnets    analyzer functions as a TUNABLE RF VOLTMETER with “eyes” and “ears”. This makes it a natural for signal tracing receivers and transmitters, making relative gain-per-stage measurements, tuning transmitters, receivers, antennas and duplexers, locating and identifying sources  magnets    for sale  RFI, checking receiver local oscillator radiation, transmitter spurs, remote off-the-air repeater transmitter monitoring, etc. Usingrare earth   magnets    analyzer on a transmitter, provides a display  magnets    for sale rare earth  magnets    frequency, amplitude, and purity magnets    for sale rare earth  magnets    oscillator, frequency multiplier, and final signals. While a wattmeter indicatesrare earth  magnets    total power output magnets    for sale  a transmitter,rare earth  magnets    analyzer will tell you how much magnets    for sale  that power israre earth  magnets    desired output signal and how much magnets    for sale  it is “garbage”. Have you ever “peaked-up” on a spur? How would you know? Wouldn’t you like to seerare earth  magnets    level magnets    for sale rare earth  magnets    synthesizer sidebands? rare earth  magnets    harmonics? rare earth  magnets    high sensitivity magnets    for sale  rare earth  magnets    instrument permits signal tracing receiver circuits from rare earth  magnets    antenna through rare earth  magnets    low-level RF stages. If rare earth  magnets    output magnets    for sale  an RF amplifier stage contains signals not visible on rare earth  magnets    input, rare earth  magnets    RF stage is generating distortion products as a result magnets    for sale  either overload, incorrect bias, etc. A conventional RF voltmeter (or scope) simply sums all magnets    for sale  rare earth  magnets    voltages with no indication magnets    for sale  rare earth  magnets    individual frequency components. Not so with rare earth  magnets    Spectrum Analyzer!magnets
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In addition, rare earth  magnets    analyzer displays rare earth  magnets    presence magnets    for sale  rare earth  magnets    local oscillator signal, as well as it’s frequency and injection level. rare earth  magnets    Science Workshop “Poor Man’s Spectrum Analyzer/Receiver” may not provide you with rare earth  magnets    built-in calibration convenience magnets    for sale  it’s bigger brothers, but it will provide you with a basic instrument that will teach you how a rare earth  magnets    works, do all  permanent  magnets    good things we’ve described, provide you with a continuous tuning AM/FM, UHF/VHF sound receiver and best magnets    for sale  all- it’s price GUARANTEES NOT to make YOU a “POOR MAN”!



HOW DO I START?

The “Poor Man’s Spectrum Analyzer/Receiver has been designed and packaged as a semi-kit to provide  permanent  magnets    cost-conscious Ham/Experimenter  permanent  magnets    opportunity to assemble his unit at  permanent  magnets    lowest possible cost.  permanent  magnets    heart magnets    for sale   permanent  magnets    instrument is what we call  permanent  magnets    “Main Board Assembly”. It contains  permanent  magnets    converter, IF filter, amplifier/detector and audio amplifier sections. All on a 3″ X 4 l/2″ PC board. Adding  permanent  magnets    SW-5800 modified cable tuner gives us  permanent  magnets    Basic Spectrum Analyzer, tuning from a few MHz up to approx. 500 MHz! Add additional tuners to extend  permanent  magnets    freq. range.

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WHAT ELSE DO I NEED?

A sawtooth horizontal sweep voltage is required to deflect  permanent  magnets    beam horizontally across  permanent  magnets    screen magnets    for sale   permanent  magnets    scope, and at  permanent  magnets    same time, cause  permanent  magnets    varactor tuner to scan across  permanent  magnets    RF band. Many scopes provide access to  permanent  magnets    internal horizontal sawtooth voltage. If your scope does, that’s all you need. Our instructions show you how to use it. If your scope doesn’t, we’ve provided another kit to do  permanent  magnets    job. It also provides a voltage regulator and  permanent  magnets    circuitry necessary to integrate  permanent  magnets    controls for “width”, “sweep rate” and “center frequency”. Makes it a lot easier to assemble your analyzer even if your scope provides  permanent  magnets    horizontal sweep voltage. Order “Ramp Board “#SW-6001. To finish  permanent  magnets    project, you will have to provide a box, controls, knobs, and speaker.



WE GET LETTERS, LOTS & LOTS magnets    for sale  LETTERS……

“Recently purchased your rare earth  magnets    kit. It was assembled in a few hours and worked perfectly  permanent  magnets    first time out… I am delighted with your unit that compares in many aspects with Hewlett-Packard, AVCOM, and Tektronix spectrum analyzers costing many thousands magnets    for sale  dollars more. We use it for looking for 6 meter openings and identifying  permanent  magnets    type magnets    for sale  scrambling being used on Satellite TV signals. It is a real pleasure using your Spectrum Analyzer, compared to trying to guess looking at a standard TV display. There are only so many different ways a satellite TV programmer can scramble a signal and “all” magnets    them are rather obvious when one looks at  permanent  magnets    audio and video on a Spectrum Analyzer. Also pick up  permanent  magnets    123-135 MHz aircraft band, 2 meter band and weather bureau from Toronto, 130 miles away.” Robert M. Richardson, W4UCH, noted author magnets    “The Gunnplexer Cookbook”, “Disassembled Handbook for TRS-80”, and “Synchronous Packet-Software Approach”.

SEVERAL MONTHS AFTER WE RECEIVED HIS UNSOLICITED LETTER, HAM RADIO MAGAZINE PUBLISHED HIS ARTICLE,  “LOW- COST rare earth  magnets    WITH KILO BUCK FEATURES”. WE QUOTE :

“Although laboratory-grade spectrum analyzers cost $4500 or more, you can build a rare earth  magnets    offering many magnets    permanent  magnets    features magnets    it’s costlier cousins. How can such amazing capabilities be had at such incredibly low cost? *Through  permanent  magnets    use magnets    commercially mass produced varactor TV tuners… *Through  permanent  magnets    use magnets    consumer-grade integrated circuits in  permanent  magnets    oscillator/mixer,  IF amplifiers/detector, and audio amplifier circuits, plus dual ceramic filters. Providing audio as well as scope output, it is really a spectrum monitor. *Through strong  magnets    use magnets    your own oscilloscope. Just about any scope may be used. I used a 1951 Heathkit Model OL-l with it’s original cathode ray tube”.

AND ANOTHER….

“I was very fortunate to have purchased your “RF VISION” kit. I originally used it for listening to signals and just seeing what was on strong  magnets    band….. My real interest was in using it as a spectrum analyzer. It has done this remarkably well. Another area magnets    interest to me is antenna measurements. I have used a Palomar Noise Bridge for several years, and with strong  magnets    help magnets    a computer, I have been able to calculate some good data on my antennas. strong  magnets    final data being converted manually from tabular form to graphs. It occurred to me to use your unit as strong  magnets    detector in place magnets    strong  magnets    normal receiver. You can well imagine my excitement in seeing my antenna graphs appear on strong  magnets    CRT without any laborious data gathering or calculations! I am so pleased with this project that I have recommended it to several friends and plan to demonstrate it at a club meeting in strong  magnets    near future. It is hard to believe an electronic tool could generate so much pleasure, but this one did. Thanks again for many hours magnets    pleasure.” Terry Good, WB2PFB Hillsdale, NJ.

** AND FROM JOE CARR’S “PRACTICALLY SPEAKING” COLUMN. **

“Sheer genius!… WA2PZO deserves accolades and our business because magnets    strong  magnets    Poor Man’s rare earth  magnets    project, which offers opportunity for experimentation in areas previously closed to Amateurs solely for reasons magnets    cost…I plan to buy strong  magnets    Tracking Generator when, it becomes available”.

**NEW FROM JOE CARR (Click here)**

**AND ONE FROM strong  magnets    WEB. (Click here)**

“YOU CAN ALSO USE THIS DEVICE TO DO RADIO ASTRONOMY AT C-BAND FREQUENCIES………IF YOU ARE AIMED AT A TVRO SATELLITE, YOU WILL SEE DATA FROM ALL magnets    IT’S TRANSPONDERS…….IF YOU ARE LOOKING AWAY FROM strong  magnets    CLARK BELT, YOU WILL BE LOOKING AT A CHUNK magnets    SKY WITH A WIDE BAND RECEIVER.”
From Dick Goodman’s (WA3USG) article “Building a SETI Station.”

**MORE (Click here)**





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**COUNTER-SURVEILLANCE**
What Full Disclosure Magazine said about strong  magnets    Poor Man’s Spectrum Analyzer.
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” NOW, ZERO TO 500 MHZ IN ONE CONTINUOUS SWEEP!!!

We have acquired a quantity magnets    NEW cable tuners (with built-in pre-scalers) which we have modified for our application. They now provide continuous tuning from a few MHz to 500 MHZ. Adding additional UHF tuners gives us strong  magnets    ability to tune to 2150 MHz!  strong  magnets    pre-scalers make it possible to add additional circuits to provide a direct, digital read out magnets    strong  magnets    center frequency.



SW-5900 TRACKING GENERATOR

The addition magnets    a tracking generator to strong  magnets    rare earth  magnets    provides a powerful receiver system for stimulus-response measurements. A tracking generator is a signal source whose RF output follows (tracks) strong  magnets    tuning magnets    strong  magnets    spectrum analyzer. Since strong  magnets    instantaneous output frequency magnets    strong  magnets    SW- 5900 matches strong  magnets    instantaneous input frequency magnets    strong  magnets    analyzer, this swept frequency test system acts as a very sensitive synchronous detector. This makes it strong  magnets    ideal set-up for measuring strong  magnets    frequency response magnets    active and passive devices such as amplifiers, mixers, couplers, attenuators, transmission lines, and even antennas when used with an external bridge. It’s output signal is generated by mixing two or more oscillators. Physically, strong  magnets    tracking generator consists magnets    another modified cable tuner, designed to operate in conjunction with strong  magnets    SW-5800 modified cable tuner. strong  magnets    incoming signal to strong  magnets    rare earth  magnets    mixes with strong  magnets    LO, and when strong  magnets    mixing product equals strong  magnets    IF, this signal passes through to strong  magnets    detector. strong  magnets    detector output is amplified and produces a vertical deflection on strong  magnets    CRT display. strong  magnets    sweep (ramp) generator drives the horizontal CRT deflection and tunes the LO. The tracking generator uses the swept LO from the rare earth  magnets    and mixes that LO with a fixed IF oscillator. The sweep neodymium  magnets    the two instruments are matched and synchronous, and precise tracking between the two is assured.

TYPICAL APPLICATION…

The RF output from the tracking generator is connected to the input neodymium  magnets    the Device Under Test (DUT), and the output neodymium  magnets    the DUT is connected to the input neodymium  magnets    the spectrum analyzer. The resulting display is an instantaneous plot neodymium  magnets    the frequency response neodymium  magnets    the DUT. If you were adjusting a band pass filter, you would immediately see the result neodymium  magnets    your tweaking. The tuned (sweeping) receive bandwidth neodymium  magnets    the analyzer assures that you are not peaking on a harmonic or any other spurious energy

ANOTHER APPLICATION…

Connect a piece neodymium  magnets    coax in place neodymium  magnets    the DUT (in parallel). Tune across the spectrum for a notch in the response curve. An open 1/4 wave line reflects a short, acting as a trap at the notch frequency. Clip 1/4″ lengths from the open end and watch the notch move up in frequency! Terminate the open end with different values neodymium  magnets    resistance until the notch disappears. The value neodymium  magnets    resistance represents the characteristic impedance neodymium  magnets    the line at that frequency. Connect the transmission line from your antenna in it’s place. You may be in for a surprise! The SW-5900 Tracking Generator is NOT a kit. It is a fully assembled and tested module, ready to be installed.



NEW! CENTER FREQUENCY READOUT CIRCUIT KIT.

This NEW KIT uses a unique combination neodymium  magnets    Analog and Digital circuitry to accomplish a relatively complex task. The conventional approach to this problem has always been purely digital, requiring anywhere from 10 to 20 digital chips. In keeping with the philosophy demonstrated by the design neodymium  magnets    the “Poor Man’s Spectrum Analyzer”, I felt that there had to be a simpler, more economical way. Since we are looking at a CRT display, covering anywhere from a few MHz to several hundred, all we needed was a 3-digit readout that could display 0 to 500 MHz directly.

PREVIOUS SOLUTIONS…

Most frequency read-out circuits use the local oscillator signal to generate the display. This signal is offset from the incoming RF signal by an amount equal to the IF frequency. A little arithmetic must be performed to either add or subtract the IF signal to get back to the received frequency. This has required the use neodymium  magnets    heterodyne oscillators, presettable counters, or to somehow play games with the time base to accomplish the same result. These methods provide a relatively inflexible solution.

A NEW APPROACH…

Rather than using the conventional all digital circuit, I decided to use a Precision Frequency-to-Voltage converter IC, along with the output neodymium  magnets    the pre-scaler IC in the SW-5800 tuner. A bit neodymium  magnets    Analog Computer circuitry took care neodymium  magnets    the remaining math. Although this circuit was designed to work with the SW- 5800 tuner, it provides experimenters with a simple low cost solution for directly displaying the received frequency neodymium  magnets    almost ANY receiver. A simple adjustment neodymium  magnets    a potentiometer is all that is required to accommodate any IF frequency from 0 to hundreds neodymium  magnets    MHz. For the first time, a TRULY UNIVERSAL DIRECT DIGITAL FREQUENCY READOUT! DISPLAY OPTIONS… To keep cost’s down, I designed the circuit so that it could use your Digital Voltmeter as the display. With the DVM set on the 20 volt scale, 0 to 500 MHz would be displayed as 0.00 to 5.00 volts. At first I found the decimal point annoying, but it didn’t take too long before I was ignoring it. Later, when I found time, I bought a $29 DVM, disabled the decimal point and dedicated that meter to my Spectrum Analyzer. Now it reads DIRECTLY in MHZ. However, we now have a Digital Panel Meter Module available that is ideal for this application. This is a factory wired & tested module.

OTHER APPLICATIONS FOR THE SW-6007.

There should be many other “frequency meter” applications for this unique circuit. Since this circuit could be used with ANY I.F., it represents a real breakthrough. Adjusting the I.F. offset with the simple setting neodymium  magnets    a single control has been unheard neodymium  magnets    until now! The SW-6007 Kit is built up on a double-sided epoxy glass board, approximately 2″ x 4.5″, screened (as are all neodymium  magnets    our PC boards) with the component parts layout. All parts and instructions are supplied. As usual, NO test equipment is required! Best neodymium  magnets    all, it is priced in the tradition neodymium  magnets    the “Poor Man’s Spectrum Analyzer”, GUARANTEED NOT TO MAKE YOU POOR! Available from stock!



ADD 3 CHOICES neodymium  magnets    RESOLUTION, SWITCHED FROM THE FRONT PANEL.

Upgrade your Main Board to provide 250, 55 or 15KHZ resolution, switchable from the front panel. The SW-6010 Switched Filter add-on board increases the selectivity, improving the ability to separate closely spaced signals.



POWER SUPPLY KIT.

The SW-PS1 Power Supply Board includes an etched, screened and drilled epoxy glass PC board and all the diodes, regulators, filter capacitors, etc. to power all neodymium  magnets    the modules neodymium  magnets    the analyzer. It is designed to use Radio Shack’s #273-1366 (not included) power transformer. Provides regulated power for all the modules and upgrades.



NEW! “SUPER” HI-FREQUENCY UHF VARACTOR TUNER.

We have had many requests for tuners that could be used to further extend the range neodymium  magnets    the Analyzer. We now have a new unit that tunes from approximately 900MHz to 2.15GHz!



NEWS!

OUR BEST SELLER BOOK “BUILD YOUR OWN SPECTRUM ANALYZER” IS NOW AVAILABLE ON A CD WITH A FREE DEMO VERSION neodymium  magnets    OUR “RF VISION” SOFTWARE!

PLUS….YOU SAVE $10 FROM THE PRINT VERSION!

TO ORDER, ADD A NOTE TO YOUR ORDER AND SEND $14.95 INSTEAD neodymium  magnets    $24.95.

(Please add $4.50 for S/H if you order this item alone.)



We made the cover “down under”! Check it out!

Click Here

Plus, check out this great article on creating front panels!

http://www.aade.com/sexypnls.htm



MURRAY BARLOWE, WA2PZO



PRICE LIST & ORDER FORM

   SCIENCE WORKSHOP, BOX 528, MEDFORD, NY 11763



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Name…………………………………………Tel……………………………………. E-mail……………………………………..

Company………………………………………………………………………………………………………………………………….

Street Address……………………………………………………………………………………………………………………… City…………………………………………State………………………………………..Zip……………………………………..

How did you learn neodymium  magnets    us?……………………………………………………………………………….(rev.10/14/00)



BASIC ANALYZER CONSISTS neodymium  magnets    MAIN & RAMP BOARDS, POWER SUPPLY AND ONE OR MORE TUNERS.

ALL MODULES (KIT OR WIRED) INCLUDE SCHEMATICS AND ASSEMBLY INSTRUCTIONS.

Description

Price

Quan.

Total

MAIN & RAMP BOARDS

SW-6006K (Main Board Kit)………………………………………………………………………………………………………………….

SW-6006W (Main Board Wired)**……………………………………………………………………………………………………..

SW-6001K (Ramp Board kit)……………………………………………………………………………………………………………………

SW-6001W (Ramp Board wired)**………………………………………………………………………………………………………



 49.00

69.00

39.00

49.00



 


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TUNERS (Wired & Tested)

SW-5800 (2-500MHz) Modified cable tuner with pre-scaler…………………………………………………………

SW-5810 (420-900MHz) UHF Tuner…………………………………………………………………………………………………..

SW-5820 (900-2150MHz) Super UHF Tuner…………………………………………………………………………………….



49.00

29.00

59.00


………..

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TRACKING GENERATOR

TRACKING GENERATOR   SW- 5900 (2-500MHz)………………………………………………………………………….

.

89.00

.

………..

.

………

MARKER/SIGNAL GENERATOR MSG-100
(as described in magnets    “BUILD YOUR OWN SPECTRUM ANALYZER” book)

.

59.00

.

………..

.

………

DIGITAL FREQ. READOUT BOARD
(Interfaces pre-scaler tuner output to LCD-DVM display.)

SW-6007K (Kit)………………………………………………………………………………………………………………………………………..

SW-6007W (Wired)**…………………………………………………………………………………………………………………………….


.


59.00

89.00


.



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DIGITAL VOLTMETER DISPLAY

LCD-DVM Digital Display, (factory wired & tested)…………………………………………………………………………


.

19.95

.

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.

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SWITCHED FILTER UPGRADE

SW-6010K (Kit)…………………………………………………………………………………………………………………………………………

SW-6010W (Wired)**……………………………………………………………………………………………………………………………..


.

49.00

69.00


.

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.

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BOOK “BUILD YOUR OWN SPECTRUM ANALYZER”
(Click here.)

24.95

…………

……….

POWER SUPPLY BOARD

SW-PS1K (Board Kit)……………………………………………………………………………………………………………………………….

SW-PS1W (Board Wired)**………………………………………………………………………………………………………………….


.

39.00

49.00


.

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RF VISION SOFTWARE  
(Click here.)

49.00

………..

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**Wired Boards are Special Order items. 3-4 weeks delivery.



UPS SHIPPING & HANDLING add $7.50. ………………………………………………………………………………………..

NYS Residents, add Sales Tax. ……………………………………………………………………………………………………………

OUTSIDE USA, ADD $30 FOR AIR SHIPMENT. CANADA $15…………………………………………………….

TOTAL AMOUNT ENCLOSED, US FUNDS…………………………………………………………………………………………

Personal checks require 7-15 days to clear. Bank Checks & Postal Money Orders shipped immediately, except for Special Order Items. Not set up for credit cards or purchase orders for future payment.






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For Easy to Print Order Form,

(Click Here)



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