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What’s really cool about this is that you can replace the capacitor (to ground between the crystals) with a varactor diode and make the filter center frequency adjustable by using a voltage. Put a

The narrowest resolution filter of my spectrum analyzer did not perform as expected to I decided to build a new filter. As I did not want to buy many crystals and go through all the difficult sorting,

While analyzing the quality of a signal generator the SA shows a number of components next to the base frequency at 6.18MHz.. There are multiple causes for these components. The first obvious are

The HMC833 has according to the data sheet a phase noise at 2GHz at offset of 1MHz of -141dB/Hz, the ADF4351 I am using has a phase noise at 2.2Ghz at offset of 1MHz of -135dBm/Hz. My measurements

Erik,? I really like your posts, not that I understand everything in them but I feel I learn something new every time so please continue.? Its a step up in price but have you considered using HMC833

This may be a difficult and less relevant topic for many of you but writing this post helps me to understand. If this is too much for this group do tell me. Many of you may have heard about "phase

Hi Erik That’s the device I mentioned, the original is from Hitite and has 0.5, 1,2,4,8 & 16 dB steps for a total of 0 to 31.5 dB. Alan G8LCO Sent from Mail for Windows 10 _._,_._,_

I am very happy with this pe4302 based module. https://www.ebay.com/itm/1pcs-PE4302-Numerical-Control-Parallel-Immediate-RF-Attenuator-1MHz-4GHz-GL/162801718054?hash=item25e7bd1326:g:rXgAAOSwVqlaMVWj

Alan More good information. Thanks. Not needing to go into the VHF range does seem to make things a bit easier. I will try DS PCB initially to see how it performs. I have blank stock in several

Hi Arv A tracking generator can be made with say 1x 10dB and 2x 20dB pads with a variable 0-10dB control which gives a 60dB range. I have used TG’s for a very long time, if I wanted to go to very

Alan Thanks for the extensive note on attenuator design and use. That helps. The intended use for these attenuators will be as part of a tracking generator and detector or direct-conversion SNA. Today

Using Arta (still learning how to use) to do the FFT and some patience the differences between the modules becomes better visible Same setup using dbm, TCXCO to LO port, DUT to RF port and USB audio

Hi Arv, Very well made points, pins and links are very cheap and there is a good wiping action. The plating is sometimes the thinnest possible because of the cost so it might not last but quick and

I see more now... I wasn't sure what the noise floor of the UMC202HD is. Neat to see the images and data, thanks for sharing and all the info.? In regards to the filtering method to reduce the USB

First real measurement results Using a UMC202HD (24bit 192kHz USB audio input) connected to the IF port of an ADE-11X passive dbm using an isolation transformer to avoid ground loops. A TCXCO on 10MHz

I'm not sure if this will help in regards to the low noise amplifier situation... however..., I have a SB0270 I've used and I need to verify performance compared to the UMC202HD that I haven't used

Did some more testing using 24bit pc audio input with noise floor at -105dB at max undistorted signal at +10dB using a dbm and various green and black modules at 50.002MHz and a tcxco at 10MHz using

Yes, full 3.3V swing I intend to isolate voltages AND add a low noise regulator for Vvco only Yes please!

Thomas, I did check quality of the module by using a high quality audio input, a dbm and two modules. Its easy to see phase noise But its difficult to make impovements as you need to improve both to

Have you measured the amplitude of the Reference oscillator that drives the PLL? often increasing this can help the spurs. As for the PN, a initial test is probably to isolate the different sections