HBTE Group Topics

The log detector of the SI is good but the ability to see a small signal close to a big signal is to be investigated. According to the data sheet at least. I ordered one to test.

Thank you for the interdigital filter link. On the same site you can also find a very interesting 199MHz Spectrum Analyzer design (As an alternative to Specan). Especially the use of a SI4432.as IF

On Mon, Mar 11, 2019 at 05:54 AM, Marcus Gustafsson wrote: what about pipe cap filters? Reminds me of this design of Cavity Filter that almost looks like a combination of the Interdigital Filter and

For the rest of the box, a couple mm here or there does not matter as much. It is only the resonator length that is critical. If the box sizes are far out, you may end up with a filter that has

In my opinion, pipe cap filters are best suited above 3GHz. I have used them up to 24GHz without problems, but their size compared to bandwith and loss makes them little suitable below approx 3GHz.

Hi all, what about pipe cap filters? Too much loss? See http://www.w1ghz.org/filter/Pipe-cap_Filters_Revisited.pdf for some details. @erik: My mental arithmetic was not working yesterday regarding

So you found the perfect mixer and want to test it, should you try to find a PCB or do a quick prototype? Using a small bare PCB, three short wires, three SMA edge connectors and some paper is

Thomas, That is indeed the calculation I used. The height of the interdigital filter is calculated a 1/4 labda. How critical is this? Its not easy to make a very accurate box. If only the rod length

I would suggest skipping the cavity, and building a interdigital filter: https://www.changpuak.ch/electronics/interdigital_bandpass_filter_designer.php Altough the link shows it as some nice, milled

2 of the 3 sim-83+ mixers on sma board i bought from a reputable vendor where bad at arrival. Not sure want to buy these again. I would go for ADE-42MH as first mixer an ADE-25MH as second and third.

On Sun, Mar 10, 2019 at 01:42 AM, <erik@...> wrote: And +6 glasses Never thought of... do I feel like a newbie. Looks like there are cost effective Jewelers Loupe glasses and the optivisor or

I found 2.4GHz SAW filters at mouser. Bought some and tried to put one on a pcb. That failed, but will try again eBay has 1.090GHz filters with SMA connectors that shoul work. 1GHz is much easier

Very interesting, keep up the good work! I'm only on my build of the Specan, also a (re-)learning process:-) Now we need a good diy description on how to build a 2.6GHz cavity filter. (I have searched

1: The SA can scan up to 1.8ghz with 1st IF at 2.6GHz. ADF modules go up to 4.4GHz 2: Some chinese. Some own build using ERA-1 on converted chinese bias tee modules 3: Only output balun. No input or

Erik, not much advice but number of questions instead besides saying that your posts are really interesting to follow. 1. Why not lower cutoff frequency on the first LPF somewhere around 1.3GHz? 2.

Now most of the modules are in, I combined everything into the complete signal chain. The purpose of this post is to document the setup and performance of this configuration. The +10dB after the

Gentleman, With Carlos KJ6ST permission , I call your attention to an outstanding, well documented, easy to implement, measurement technique.

Encuraging for me at my 74. Let me try Thanks

Hand soldering 0603 is doable. I use regular fine tip solder iron and thin reason core solder. No additional flux. And +6 glasses

I tested the second one. The black board. It has a 25MHz reference. The green board has a 10MHz reference. I ordered also the green to test because the layout seems better and price has come down and