U Autek Research QF-1 $ SOLD Audio Filter This Autek Research QF-1 audio filter features: Peak, Notch and Low Pass. Input is via a hard wired ¼. Autek Research, PO Box , Wesley Chapel, FL USA. () RF1 RF ANALYST. The pocket-sized RF1 is designed. Hi, I have for sale one used Autek Research model RF-1 antenna analyser. It works well and is great for analysing antennas in the field.

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Full adjustment and calibration requires unsoldering a board. The following graph displays the recorded data when the frequency was swept from 2 through 29 MHz, and the RF-1 was connected to the test coax with a For an SWR of 2, the reflection coefficient is 0.

The following graph displays the recorded data when the frequency was swept from 2 through 29 MHz, and the CIA-HF was connected to the test coax with a That data came from a web site that sells that particular autej.

So a tuned circuit is needed.

I then used the Lowband software to compute the complex impedance at the input of the cable when the load was set to various resistances. I have had mine for 6 years. Ahtek the purposes of future graphs related to the 2.

Took it home and fired it up with a precision 50 ohm resistor. It wasn’t designed as a VFO.

Antenna reactance and capacitance measurements would put some professional equipment to shame. I supplied the reactance sign in the and CIA-HF columns, since the devices do not indicate the sign. But any distortion on the sine wave increases the SWR.



Since the frequency is being held at 3. The precision resistors are references tor testing. We adjust it by connecting r-f1 series-tuned circuit, similar to Fig. This is the opposite test to what was performed in the previous section, where pure resistances were measured. The is somewhat more expensive than the B.

Autek Research RF-1 RF Analyst

RF-1 Response at 3. For my recent applications, that would be very helpful.

I bought the RF-1 Analyst for general use several years ago. I connected these three parts into several series and tf-1 combinations in order to create a set of expected values. Pure Capacitive Reactance Test at 3.

Autek Research RF Analyst

All of the impedance values will repeat every half wavelength. These features alone makes it unique at its price. To maintain lowest distortion you should load it down as little as possible. The initial use of the portable antenna analyzer was to measure SWR.

Dan and I worked independently, and we happened to exchange emails after I had finished my page, but before the compendium was available. For consistency sake, use an external power supply, or fresh batteries. As before, the sign of the reactance was taken from the computed data.

Autek Research QF-1, Autek Research QF-1A, Autek Research RF-1

Each is several years old, and while I don’t believe that I have ever dropped or abused them, they have been well used. It is normal for readings to change several times a second if the last digit or even two exceed the measurement tolerance.


This ratio should be between 0. This gives me the convenience of the analyzer with a hopefully higher accuracy. So after reading about all the bad experiences some people have had Been having this unit for over a decade, time for my “after winter check on the antenna”.

Another reason is that I was measuring what I would call a shielded system – a handful of resistors connected to a rather short length of transmission line sitting on my test bench The more common application for an antenna analyzer is to measure, antennas.

Is something wrong with the meter? As part of doing some balun analysis, the author spends some time looking at the accuracy of low-power SWR testers. I suspect that these programs could be made to produce identical results if you understood how to answer the different sets of setup questions with an eye towards how those questions drove the underlying computations, which should be identical, or at least very close.