Hi, First of all, the PHSNA is a Scalar Network Analyzer, not a VNA. For a VNA google for nanoVNA, it is portable and already built, but for around $50 I think that it is impossible to build one yours

Another good option for a Poor Ham Spectrum Analyzer is using a SDR receiver. You have many choices, for example if you want V-UHF, there is the RTL Digital TV dongle that is being sold for $10 and it

Hi Ted, The crystal measurement coefficients were added in version 1.42 (or maybe in 1.41, I can not check it now) after realizing that the "normal" set of calibration coefficients accounted for the f

Hi, Nick has a better memory that me and he is right, v 1.40 and v1.42 parameters.txt are not compatible because the later has a second set of polynomial coefficients, this one for the crystal measure

Hi Ted, The parameters.txt file included with the distribution are an example and must be replaced by one that is matched to your hardware. I believe that there were not changes between versions 1.40

Hi Jim, The PHSNA project hardware has a a lot of variants. The main one used a DDS60 module from AmQRP. This used the AD9851 DDS and it is sold assembled or in kit form at http://midnightdesignsoluti

Copper foil is good, but you can also use tin foil recovered from a beer can (one that is not made from aluminum) Remove the paint and cut it to size with a pair of scissors. 73 de Ignacio, EB4APL ) -

There is a problem with this board, it is used in another version of the PHSNA (DDS-60 and Arduino Nano) so you will need the main board for it. Regards, Ignacio, EB4APL

Hi Ambro and other new builders, The PHSNA last version for Arduino NANO and DDS-60 has a lot of options on the board, so if you are going to build it study the schematics and the info carefully and y

The key phrase is "if you are a member", you will nor see files and photos if you are not. Regards, Ignacio, EB4APL

Richard, This group is full of people that are eager to help you, but we need some basic information before. What type of main board do you have? If you are not sure, send us a picture, then we can po

Hi Rich, Did you have browsed the group files section? And what type of main board do you have: DDS-60 and Nano, Type I Chinese DDS module or Type II? The power meter boards have identical schematics,

The unmodified filter graph lacks the cursor over the filter dip. This one has it to better know the calculated frequency and attenuation. 73, Ignacio

Since we are fighting with a single frequency, probably the best filter solution would be a trap. I just modeled the elliptical filter used in the DDS-60 using AADE filter design program and the serie

I don't think so. The transformer reduce it a lot, as per Clifford explanations, but a suitable filter works also. And using the transformer and the filter (or trap) "could be" even better . I say "co

The problem that we are dealing with is the 180 MHz clock feedthrough in the output. It was discovered when turning the RF off, but it is present with the same amplitude when it is on, where it matter

The 180 MHz component is intrinsic to the DDS design, any frequency generated by the DDS is sampled by the 180 MHz reference clock. Maybe you are right and this type of connection causes the DAC to ou

This is exactly what I did, I have a connectorized 30 MHz LP filter and I inserted it between the input and the output of the PHSNA. This time it is not a harmonic problem, it is the 180 MHz refclock

Hi, I must say that the feedthrough issue was discovered by Camille Farrougia, F4IBA, who emailed me about this. He is also building the French language support file. As Nick says, the forthcoming ver

Hello Tony Fishpool, Do you mean that I sent the direct message to you instead of the other Tony G3PT? Well, I'm more puzzled now because I don't find the message in the "Sent" folder. 73 de Ignacio,