Noise Reduction

Noise Reduction on 40m Priority listing - DF9CY implementation of W1HIS suggestion of inserting a common mode choke into a 40m antennas feed-line.

Local QRM reduction - It is not always possible to tackle the sources of local QRM. What remains is trying to reduce the noise level by means of your antenna system. Learn how to reduce QRM and understand how cancell noises by PA0SIM

Importance of noise reduction in wires antennas - An old post by John Doty about effects of noise in longwire antenna.

JPS Communications - Noise reduction products

BHI - Speakers and RFI noise reduction products

Timeware tech. - Amateur Radio Products, Noise Reduction Filters, Data Controllers, deviation meter, Software, DSP-RTTY

Timewave manuals - Timewave Documents for User Download, PK-900 Multimode Data Controller, PK-232 Multimode Data Controller, DSP-232 Multimode Data Controller, DSP-9 Noise Reduction and Bandpass Filter, Audio Signal Processor and Noise Reduction Filter, Audio Signal Processor and Noise Reduction Filter for Yaesu SP-5 and SP-6 Speakers

Mods fro Yaesu FT-1000 (FT 1000 FT1000) - ham.dmz.ro FT1000 pages

FT817 DSP noise reduction noise - Add-on audio DSP unit from BHI

DSPBOX - DOS Freeware, DSPBOX is an attempt to code the Texas Instruments DSK 'C50 in such a way to make it behave like a commercial DSP noise reduction unit, like the NIR-12, the TimeWave 599+ and others. Not only the noise reduction function has been implemented, but automatic notch, AGC and Band Pass have as well.

A cheap noise reducing speaker - Noise Reduction on the Cheap PDF File

QRM and noise reduction Priority listing - You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array. Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM

Noise measurements and reduction - K1SIX- Noise Measurement and Reduction Techniques