Amateur radio station since 1993

RA3WDK `s Homepage




MenuMaker produced RA3WDK

Status AU 144 MHz

Status ES 144 MHz


Status MUF today

Map Tropo Forecasts

* < 160m Propogate > *

RF Calculators


My MP3 collection

from AIR



CW Skimmer Server




Hi, I'm Ivan Shor RA3WDK !

This page about my hobby : Amateur Radio

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

Low Band DXing Two Tone Test Generator 14 MHz

Noise Canceller`s

For Sale *PayPal available, ask me for more info*

LNA with SPF5189z

BPF, input - output protection

50$ +shipping

LNA with SPF5189z

BPF, input - output protection

50$ +shipping

LNA with ATF54143

BPF, output protection

50$ +shipping

Common-mode current chokes for 160-80m Band with EPCOS core inside

Look here more info

50$ +shipping



Description of 5-Band Yagi 2el 14 MHz, 2el 18MHz, 2el 21 MHz, 2el 24 MHz, 3el 28 MHz


New Low Noise Preamplifier for 2 m Band - filter, static and power protection...

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 !

PreAmpAD8129 PreAmpAD8129



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


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 !


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....

Smart Automatic Antenna Tuner for portable QRV


Magic QRP SWR Bridge

Easy modification AM broadcast receiver


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 :



This bug want to help us in Field Day

Just see more about.....



Solar Wind


VHF : UHF : SHF Cluster __

SK6AW DxSummit F5LEN

New awards has arrived


DX QSLs has arrived

Zone #3 WAZ on 80m !






You can send me FeedBack or Sked

This website is Copyright © 2008-2009 author/webmaster : RA3WDK