YU1LM/QRP site navigation
new from last site update
o Homebrew
o YU1LM SDR clasification
o DC (direct conversion) receivers
o DC RX-YU1LM Serbian
o DC RX-YU1LM English
o DC (direct conversion) transmitters
o Audio phase shift networks
o Tunable crystal filter
o Tunable HF BP 2-30 MHz
o Band pass 1.8 MHz
o Band pass 50 MHz
o Band pass 144 MHz
o DR1
o DR1A
o DR2
o DR2A
o DR2-2
o DR2B
o DR2C
o DR2D
o DR2E
o DR2G
o DR2A+
o DR2A++
o DR3X
o DT1
o DT2
o DT2A
o DT2A1
o ADTRX1
o ADTRX2
o AVALA-01
o AR1
o AR1B
o AR1C
o HF/VHF oscillators
o Synthesizer RZ6HY
o Miniwhip PA0RDT
10258 visitors on QSL.NET since 4. Dec. 2002
You are visitor
  |
| classifiedads.com |
since 5.April 2006
Filters designed by YU1LM/QRP
All published designs and materials are free for personal and non commercial use. Other use for commercial purpose are not allowed without permission of the author.
Variable Bandwidth XTAL Filter
The original paper is published in SPRAT magazine journal of the GQRP Club nr.109. Author is member of GQRP Club number 10091.XTAL Filter is interesting because it is possible to change bandwidth between CW and SSB with input and output impedance close to 50Ohm. For CW bandwidth XTAL filter is very interesting amplitude and phase response. It is close to Gauss response and because of that there is no or low ringing. It is possible to design filters with fixed capacitors. Measurements gave very good agreement with design and very high IP3 in vicinity of 40dBm!!!
A Tunable Bandpass Filter for All HF Bands (160m-10m)
This paper is published first in SPRAT magazine journal of the GQRP Club nr.115/2003 20 pages and simulation diagrams. I like very much design and experimenting in design with the 50 Ohm modules. It is possible very easy to check, measure and change design. This is one of the mine very often used and favorite RF brick. Here is complete article with all diagrams which was shorted in Sprat magazine. Design is very simple 4 (6) fixed coils 4 toggle switches 1 double variable and 3 fixed capacitors and you can tune over whole HF band with insertion loss good enough for transmitting purpose max IL=2-3 dB.
Band pass filters for Top band -160 m
This filter is designed to improve selectivity and receiver IMD specifications on top band.
.JPG)
.JPG)
Band pass filter for 160 m built by Michel ON7EH
Band pass filter with low insertion loss IL for 2 m
This is input band pass filter for mine 144 MHz SDR receiver. It has a good selectivity and insertion loss is 0.65 dB max. Realization is simple ,very easy and repetitive.
Band pass filter for 2m-YU1LM.pdf
Band pass filters with low/moderate insertion losses IL for 6 m
This article describes 3 types of input band pass filters for 50 MHz receiver/transmitter use . They have good/moderate/high selectivity and insertion losses in range from 0.65 dB to 2.3 dB max. Realization is simple ,very easy and repetitive.
Band pass filter for 6m-YU1LM.pdf
I corrected BP schematic which wasn't readable