Lightning Protection for Rotors
want to buy assembled and tested board please look at
K6VHF`s info here
description of LPR
Magic QRP SWR Bridge v.3
want to buy KIT of Magic Bridge or assembled and tested
board please look at K6VHF`s
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.
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
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.
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
. You can use SIMNIA 0, PETROLEUM JELLY S68OO,Mobiltemp
SHC 100, AEROSHELL 15A or or good quality machine oil.
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....
+ Modification + CW
USB Power Metr
power from 10 MHz to 12 GHz !
who owns this Power Meter :
RZ4HD, UA3DHC, R6DZ, RA9YMI, UZ5DU, US3IET, RA9FOR