RA3WDK Home Page

Amateur radio station since 1993

RA3WDK `s Homepage

MenuMaker produced RA3WDK

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AU 144 MHz

ES 144 MHz

From MMMonVHF

MUF today

Map Tropo Forecasts

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RF Calculators

My MP3 collection

from AIR

Web SDR

CW Skimmer Server

HamQTH

Hi, I'm Ivan Shor RA3WDK !

This page about my hobby : Amateur Radio

Well, but what about my next hobbies? - Sail, of course.

Mods. TS-830	Sound `s from Top band	Dual Band Horn	Mods. PA R-140	2 way Sequencer
Mods. circulator CD150-B for amateur 2 m band	RF voltmeter & Dummy Load	CW electronic key	Collection of Awards	Amateur SAT transponders
TriBander and FiveBander	Low Band DXing	Two Tone Test Generator 14 MHz	Noise Canceller`s	Simple FM Ant 145+433

Low Noise Preamplifier for 6m Band

Log-Periodic Antenna 250MHz-7000MHz with Load Coil Dipole elements

LNA 5760 NE3210

Two CW filters to TS-570 ???

Look here my new idea ! Noise tester for test HF-VHF transceivers.

You need only connect 9V battery to Noise Tester in PL-259 connector and you see in S-metr S 6-7 from 160 to 2 meters !

Making new Preamp for Quad-directional Flag with optional filter

Yagi 5 Band + Load Coil Dipole 30m

Review "New Old" Cavity LNA with MGF1303

How to make a tubes tester for 6146B / S2001A

Repair and modification LNA 144 MHz with SPF5189z

Test Five-Bander (20m 17m 15m 12m 10m) for 7m on the ground

First QSO`s on 17 m : JA4DNC,VO1MP, MI6GTY, J68HZ ....

Digital Recirder with two message + switch for Mic and Digital mode

2-way PTT Sequencer now available with options

New project LNA 5,4-5,8 GHz

LNA 5,6-5,8 GHz with EPB018A5, more info here

New design of LNA for 1296 MHz , ATF54143, 50 mA Nf ~0,55db

USB Power Meter

Measure power from 10 MHz to 12 GHz !

My new Designs & Articles :

High IP3 LNA 144 MHz with two channel output

"Gold edition"

Experimental Tri Band yagi for 14/21/28 MHz Bands

Second CW filter in 1st IF of TS-830

The Lightning Protection for Rotors

If you want to buy assembled and tested board please look at K6VHF`s info here

Download description of LPR

New Magic QRP SWR Bridge v.3

If you want to buy KIT of Magic Bridge or assembled and tested board please look at K6VHF`s info here

If you want to use your old HF tranceiver in VHF in EME or MS QSO - you must increase stability of frequency. For example - i use my old IC745 with my 144/28 XVTR . I have good total value of frequency stability for long sending cycle without TXCO. You need only some a bit of polypropylene for VCO, 2nd LO and LO.

In old tranceivers often was problem with switchknobs XIT/RIT.

Good idea is - to use old switchknobs XIT/RIT for control of good relay. Now only clear of relay ladder with good contact will be control XIT/RIT . For example - i use russian relay RES-49 in easy layout !

Repairing old potentiometers

The change of original components when restoring old radio or transceiver sets is always an unpleasant. In the case of potentiometers it is difficult to find double original potentiometers for RF/AF or Mic/RF PWR.

If you hear rustling in old potentiometers of your old transceivers you need repair them with oil. My practice is to use syringe with solid oil + spirit. Usually I use russian solid oil ÖÈÀÒÈÌ-203 (ÃÎÑÒ8773-73) . You can use SIMNIA 0, PETROLEUM JELLY S68OO,Mobiltemp SHC 100, AEROSHELL 15A or or good quality machine oil.

You don`t must to open potentiometers, you must only press out some oil with spirit into potentiometers. You must to turn the potentiometer minimum 20 times from end to end. The solid oil hits to center contact and will protect contact near axis.
This technique is very effective and, usually, these potentiometers will still perfectly efficient. But i know what in 5% of cases where the resistive surface has been damaged and way with repair potentiometer by oil does`t work. More info you can look here....

NF measurement

Horns for 5,7 / 10 / 24 GHz

Smart Automatic Antenna Tuner for portable QRV

High dynamic range XVTR Front-End

High IP3 LNA for 1296 MHz with BPF

Power supply "POWER ICE 30A"

LNA for 144 MHz/ Avia Band & FM BC with SPF5189Z by RF Micro Devices

COMPARING DIFFERENT LNA of 144 MHz Band For Use in Noisy City

Magic QRP SWR Bridge

Easy modification AM broadcast receiver

VEF-202

After modification ... Air 40m band Air 17m band

QRP CW Transceiver

+ Modification + CW filter

USB Power Meter

Measure power from 10 MHz to 12 GHz !

HAMs who owns this Power Meter :

RW3AZ, RZ4HD, UA3DHC, R6DZ, RA9YMI, UZ5DU, US3IET, RA9FOR, RT5D, RA0LDP, RT8B

UpXVTR 120-210 MHz for NWT-7

Broadband Electromagnetic Field Finder & Field Strength Meter

10 MHz Rubidium Frequency Reference

Oscilloscope analyzer SWR & S21 parameter

This bug want to help us in Field Day

Just see more about.....