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      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 by 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!!!

XTAL-VAR FILTER-YU1LM.pdf

Variable bandwidth CW/SSB crystal filter built by AK2B

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.

BP FILTER HF-YU1LM.pdf

Band pass filters for Top band -160 m

          This filter is designed to improve selectivity and receiver IMD specifications on top band.

           Band pass for 160 m-YU1LM.pdf 

            

          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

Band pass filter for 6 m built by Gernot OE1IFM

http://www.oe1ifm.at/index.php?option=com_content&view=article&id=76&Itemid=75

 Band pass filters for HF contest stations with insertion loss lower than 0.5dB

This article describes output band pass filters for multi/multi HF contest station  for receiver/drive transmitter use . They have good/moderate/high  selectivity and insertion losses are in range to 0.5 dB  max with real built in components. Realization is very simple and repetitive. All filters have 3 equal coils. This filters are possible use in SDR transceivers also.

 HF-6m band pass filters -YU1LM ver1.pdf  

 HF-6m band pass filters -YU1LM ver2.pdf  

 HF-6m band pass filters -YU1LM ver3.pdf  

Output HF-6m Band pass-Low pass filters for SDR and classic transceivers 

This article describes output band pass  and  low pass filters for HF-6m SDR and classic transceivers such as AVALA-01 ,Genesis ( www.genesisradio.com.au )  series G40,G3020... They have good/moderate/high  selectivity and insertion losses are in range to 1dB.

 Output HF-6m BP-LP filters for SDR transceivers -YU1LM .pdf  

Input HF-6m Band pass/Low pass filters for SDR  transceivers

This article describes input band pass  and  low pass filters for HF-6m SDR and classic transceivers such as AVALA-01 ,Genesis ( www.genesisradio.com.au )  series G40,G3020... CER . All filters are realized with standard coil values.

 Input HF-6m BP-LP filters for SDR transceivers -YU1LM .pdf  

Input LF Band pass/Low pass filters for frequencies from 100kHz to 500kHz

 Low frequencies below 500KHz are very interesting for experimenting for communications with low power including new experimental band 500kHz now after very beginning of radio communications  . In article which I wrote after my friend Nick VK1AA asked for possible BP/LP solutions I am proposin9g several possible solution from low to super selective filters. All filters are realized with standard component values.

  Receiving BP-LP filters LF frequencies and 500kHz -9YU1LM .pdf  

 

Super selective BP  filter for 500kHz realization, measured amplitude -frequency response and measuring together with YUMA 500KHz transmitter by Nick VK2DX(VK1AA) www.genesisradio.com.au

HF Multi-band Diplexer Filters for Simultaneous Work at Several Bands with the same Antenna

  This design was challenge for me to design network which will enable simultaneous  work several HF transceivers to the same antenna system. This design is also interesting for some other application such as DX expeditions, SO2R...

 HF Multiband Multiplexer Filters -YU1LM .pdf