HBTE Group Topics

Thanks for taking the time to explain further Erik. So sharp filters and mixers with good isolation is the key then, good to know. Please keep us posted on your progress. And if I get around to

1: Between IF1 and IF2 so: 2510.7MHz -> 110.7MHz -> 10.7MHz 2: Got rid of leakage of LO's (bumps in first part of spectrum of first post) and got rid of mirrors. The IF1 filter is actually 100MHz

Erik, can you please elaborate the following: 1. The 3rd IF@110MHz, was put after IF2@...? Or in between IF1 and IF2? 2. How and why did that affect performance? (Trying to learn here so links to

I added a third IF at 110MHz. Now performance is acceptable. Two examples: Wide scan: 200MHz output of a SI5351 through 50dB attenuator to see the harmonics. The actual maximum scan frequency is

This morning it occurred to me -- an MMIC on micro-stripline will basically amplify ANYTHING from DC to daylight, so I googled on "MMIC noise source." It led me to a site which showed a HB noise gen

You can also use the base/emitter junction of a random transistor in place of the zener for the noise generator portion Jim

Jim, I do not have much more than what I posted. As to a design for UHF, I am not the best to answer that. You guess looks reasonable to me but that is like asking Ronald McDonald to check over your

Doug, Do you have a sample circuit for a noise generator that goes an octave or two higher? Would you be willing to speculate on stripline / SMD construction techniques to go up to or past 1 GHz?

I want to test filters and once again Santa stiffed me on all the fancy test gear I wanted. It could be my fault as my chimney leads to the boiler. Anyway, I have an rtl-sdr and an upconverter so

Some pictures: The complete analyzer: Signal left to right: Input low-pass filter (green), mixer (blue module), IF1 filter (big black brick) ,mixer (blue module), IF2 amplifier (green module), IF2

For the PC I started from scratch using .net libraries. I like the Specan SW as its pure C but that also implies it is too much effort to add functionality The arduino SW can easily be made to work

The arduino SW is a rewrite/combination of various SW's It can be used as a standalone tool controlled over the serial interface The ADF4351 library is a rewrite of something I found but spur

Hi Erik Your design is really good. At the cost level it is still reasonable considering the announced possibilities DC-> 1.8gHz For the software, did you start from the Ashar code for the Specan /

This is the high level diagram Regular dual conversion architecture with two mixers with first IF for image suppression at IF1 and second IF for resolution bandwith at IF2 and log detector for

On Sat, Dec 15, 2018 at 07:58 AM, <erik@...> wrote: I would also be interested in seeing what you have. I am working on something similar only going up to 250 MHz. It is using 31 MHz saw filters for

I second the thought. Very impressive. Understand there are some bugs but, publishing what you have will encourage others to give it a go. Maybe even me! Gene N2IJF From: HBTE@groups.io

Impressive! Any thoughts on publishing your circuit and methods of construction?

Hi, Just wanted to share success in getting the first scan of my own build 2GHz spectrum analyzer build almost completely from readily available modules from eBay. Total cost is less then $200. Here

Doug, kinda depends on what you use it for I guess. I spent some time pondering this a couple months ago. The old school HP350s used 3 to 7 watt resistors, the 355's look smaller, didn't see

They are talking about attenuators for use between a signal generator and the radio for receive alignment where the signal is only a few micro-volts. Not for transmit.