[HamBrewers] Re: [VUHams] RE: PROJECT

 

Ganesan,

 

Thanks for posting the photos again. Appreciate your efforts to bring out quality stuff for Radio Hams in VU. Please setup a blog / website where you can post your projects and how they can be purchased and also a channel on youtube for demo on the products.

 

73

Nitin [VU3TYG]

 

From: Namachivayam Ganesan <ganesan4u@hotmail.com>
To: vuhams <vuhams@yahoogroups.com>; hambrewrs <hambrewers@yahoogroups.com>
Sent: Saturday, 25 August 2012 9:08 PM
Subject: [VUHams] RE: PROJECT [3 Attachments]

 

Dear OM,

I got feed back that pictures attached on previous mail is not clear and unable to open.

pls find the attachment

the details of my filter LRR-10  HF noise reduction audio filter (under testing)

The LRR10 is a high performance versatile audio filter that can be used with any receiver or transceiver. It can improve intelligibility of CW, phone, or data signals, and is especially well suited to radios that have inadequate I.F. or audio filtering. The LRR10 uses straightforward analog circuitry and no surface-mount components, so it's an ideal DIY project for Home brewers.

            Low-noise analog variable audio filter circuit used here is a low-pass filter with switched capacitors, elliptical, of 8th order for improved audio easily compares the reception with that of a receiver equipped with DSP filter.

             This circuit design follows a standard well-proven approach based on various kits available on WWW modifications have been done.

           

Features & specification

 

•  Variable Filter Bandwidth approx. 600-4000 Hz
•   2Watts Dc controlled audio amplifier.
•   PCB Size 95 x 60 mm.
•   12VDC Power.
•   Available as a DIY kit or fully assembled high quality components for reliable operation.

active device used MAX293 ,BB112 & TDA1013B

LRR-102 (LOW NOISE VHF PREAMP) -Under testing

•  Frequency : any 3MHz bandwidth of 50 to 500MHz
•  Gain : 20dB nominal
•  Noise Figure : <1dB
•  Power : +12 VDC @ 50Ma

APPLICATION:

•  OSCAR Satellite reception
•  Nova Satellite reception
•  Long distance Repeater stations

active device used BF960 

73,

N.Ganesan

09363105352

Coimbatore

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