开云体育

I found a copy of a 1998 Murata databook for these sorts of filters. One set of graphs shows the effect of having source/load impedances which diverge from 330 ohms. Higher impedances seem to create

I've moved the case over to Cults for a paltry donation($2) to help with my time and costs. You can print this in any material you want. TPU is a softer material with a cushion.

I'd very much appreciate postings of the PDFs of the filter data sheets, Bob. A lot of the information on the older parts is getting hard to locate.

I have a few Model 18s and a Model 19 receiver. The Model 19 schematic is Oh, that's a beauty! Individual IF filters tunable inductors and caps - five adjustments per section, each. That really is

I have a few Model 18s and a Model 19 receiver. The Model 19 schematic is attached; note no transformers. What do you make of it? The 18 has a BJT input stage vs. the 19's JFET, and the 18 has no AGC

I have the Murata data sheet here, and for a 180 ceramic filter, your group delay plot looks normal. Murata does not show data beyond +/- 150 kHz, though, and the y axis scale is 1 dB / divison, 6 dB

Thanks, SJ - I rather suspected something of the sort. Something that's certainly going on here, is that the measurement plots are for the test-jig-plus-filter, not just for the filter... I calibrated

Great to hear it works for you! OTG cables, which are typically microUSB, always have pins 4 & 5 connected at the micro plug end. Pin 5 is GND and when 4 is pulled to low on a device that supports

UPDATE Got it working. Looks like the usb-c socket on the nano may be a little sloppy. First, I used the USB Serial Console app and was able to send commands that worked such as "help" and "pause" and

I'm not sure whether this filter was specified to be linear-phase, but I believe that was probably part of its goals. It's an IF filter specified and sold for use in FM stereo tuners. In these

There is for sure a problem with this measurement. When the two GD-peaks in pass band looks like this something is wrong. That is confirmed by the pass band curve that is too un-symmetric - rolling

Hi David. I understand and it is often the case when measuring with Network analyzers. In the first setup you find all the flaws and the second is much better. I have experienced it so many times, but

My H4 arrived today. Although I didn't pay for it, it looks like it shipped by DHL on the 15th of Feb, arrived YYZ on the 20th, and spent the rest of the time clearing customs and taking the slow boat

N-connectors at full legal limit: I exclusively used N-connectors when doing EME at 1.5 kW on 2-Meters. No problem. A short run of RG-8 coax to the Bird meter got warmer than the connectors in that

This reader operates in the 13.56 MHz ISM band. The reading range is very close-in, roughly to 1 cm. While the RF link is established by an "antenna" of sorts, it is not an antenna in the usual sense

Pl-259 was invented in the 1930s as a form of shielded "banana plug."Sent from my Galaxy Tab? S2

It's interesting how the focus or center of discussions drifts. This started about testing filters with UHF connectors, so obviously they would have to be used in this case.. The discussion of N

Hi Daniel,I have no idea what you are building (HI), but I Googled "mfrc522 antenna" and got LOTS of sites, including construction pages.Good luck.Ed? KB8ESVSent from my Galaxy Tab? S2

A simple google search: https://www.google.com/search?client=firefox-b-d&q=rfid+antenna+design yields: http://ww1.microchip.com/downloads/en/appnotes/00710c.pdf check page 20 for details. Hopefully,

Hi Everyone, I'm trying to develop my own rfid antenna for mfrc522. It's my first one, so... it's very difficult. Do you know the procedure to properly tune my antenna ? Or a good tutorial to help me