In my day (the 60's) spectrum analyzers used a swept oscillator into an IF
amplifier and then through aconverter to baseband. We did not have computers
capable of doing the display by the FFT process.
My plan is to use the sweepable oscillator to oscillator to provide the LO
for the first converter and convert the signal to baseband in the external box.
The computer will be used to convert the audio input to the spectrum or scope
display.
I can write an application that would run the sweep oscillator from the PC
and display the result on the PC. But this is not a simple piece of hardware
like the simple SD receivers I know about.
Bob Macklin
Seatle, Wa.
"Jose A. Amador" <[EMAIL PROTECTED]> wrote:
My previous reply was about AUDIO analyzers. RF types are a different
breed, and not sound card types (at least, without some extra hardware),
and rather narrowband, because of the low sampling rate.
Nevertheless, maybe a mix of sound card technology and sampling spectrum
analyzer could be implemented with some extra hardware.
You might look for the S53MV spectrum analyzer, there are some in QEX as
well, and old Ham Radio issues, that will at least give some ideas
worthy of consideration, which might be embellished with state of the
art hardware.
73,
Jose, CO2JA
---
Bob Macklin wrote:
> I want to do a RF spectrum analyzer maybe to 100MHz. I found this one
> this morning. I will test it later today.
>
> http://www.sillanumsoft.org/
>
> I am thinking of using a simple mixer/LPF with a Heath RF signal
> generator and a wideband frontend.
>
> If this works I make a PIC based RF generator using a VCO driven by the
> PIC. I already have such a VCO working for a HF receiver. The VCO has
> about 100HZ short term ( several minutes) open loop stability with the
> VCO working at 10MHz.
>
> It's strictly for ham radio work.
>
> Bob Macklin
> Seattle, Wa.
>
>
> */Larry W8ER <[EMAIL PROTECTED]>/* wrote:
>
> Hi Bob .. I'm retarded too. Audi o or RF? -- Larry W8ER
>
> Bob Macklin wrote:
>> Are there any decent sound card spectrum analyzers?
>>
>> I can't by a real one. I'M RETIRED!
>>
>> Bob Macklin
>> Seattle, Wa.
