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Have you looked at the RF Explorer? $119.00 and up depending on what options and frequencies you want. Can be controlled via a computer or in standalone mode. <http://j3.rf-explorer.com/>

The AD9850 modules seem to be the most common. The AD9850 makes square waves as well as sine waves. Are the square waves OK. The SI570/SI5351 only make square waves. The way I am reading this the

As to gear to measure the output of a DDS or other RF source. DVB-t with upconverter, generally cheap and with care and step attenuator measuring to -60dBc is not difficult. If you need more than that

Nick, The spurs from 9850 are not directly related to harmonics or frequency settings ( they are related but the math will make your eyes bleed). Generally they are from D to A artifacts like each

For some reason, cannot find this topic online to check whether anybody has noted that there is some pretty functional spectrum software available for sdrplay v1,2. There are some problems with it,

I have two of the QRP Labs SI5351 modules. One is the Arduino shield module. I've been thinking of assembling it. Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"

That's beyond my budget! Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"

Bob, You should try one of these(under $4USD):

A spectrum analyzer would be a great instrument for a serious homebrewer, but they're expensive - like $1,500 or so although you can go higher or maybe lower with some effort. I almost jumped on a

Per sdr-kits web page: https://www.sdr-kits.net/index.php?route=web/pages&page_id=68_68 VNWA 3EC (recommended for S11 and S21 with single sweep) = USD $525.78 John KN5L

What should I use to GOOGLE for AD9850 spurs? Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"

What does "LOW COST" mean? Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"

I use both the VNWA 3 from DG8SAQ and love my old 400Mhz Marconi 2382.. All good for xtal and ladder filter design.. Have uploaded various jpg's to the Yahoo DG8SAQ group showing the filter responses

While looking at the DG8SAQ-VNWA3 on ebay, I came across a low cost device called the nano VNA for around $64.00. It appears to have decent features for the price in a small package including display.

I have both HP8658B and Rigol DSA815t. Testing the 9850 output is easy, pump it into the SA and look at the spectra. However... you will find spurs. The 9850 is a very old part and the number of bits

Recently using VNWA: https://www.sdr-kits.net/introducing-DG8SAQ-VNWA3 in spectrum analyzer mode measuring RF amplifier parameters including noise figure and OIP3. Some results in:

BTW: My current interest is to use a DDS to replace the LO/VFO in a NorCal40 and a NorCal Sierra. Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark"

I have tried searching on "AD9850 spur problems" and have not found much of interest. How bad is the spur problem with a DDS. Can bandpass filters eliminate them ? Bob Macklin K5MYJ Seattle, Wa. "Real

Software defined receivers are a useful tool. Some of them can see a wide area of the spectrum at once: about 2 MHz for RTL-type receivers and nearly 10 MHz for Airspy or SDRplay. The dynamic range of

Steve, I worked with the HP gear back in the 70's an 80's. So I am familiar with it. A few years ago I joined the HP Test Equipment group and saw the problems they were having with the digital stuff