On Tue, 25 Nov 2003 09:44:32 +0200, "Edgar" wrote:

The radio receiver is russian made "Volna-K" it means "Vawe-K" in english.
It has a coxial output.

Here is some more information about it:
Go to
http://babelfish.altavista.com/

and Translate a Web page form russian to english
http://www.cqham.ru/trx/volna.html

Tnx,
Edgar
73


Hi Edgar,

Bozidar has already identified the input Z (200 Ohms). As for the
rest of it, the schematic reveals it has a turret tuner (or barrel
tuner) for changing bands. Such a mechanism allows for tuning over
multiple bands to provide for both greater tuning resolution, and
linearity. The Tuning mechanism contains an antenna coupling filter
(following a general low pass filter with neon tube suppressor at the
input connector); two stages of Tuned RF amplification; and one Tuned
Mixer/Oscillator. The schematic is pretty rough, so I could be wrong
and it is one RF Amp, a Mixer, and an Oscillator. It may need
alignment for best service.

Almost any antenna longer than a whip (small wire dipole 10 - 20 feet
high) will do.

73's
Richard Clark, KB7QHC

Thank you all,
I can do understand Russian very little too:-( The problem is I am new to
all this technical radio stuff. I am an ordinary SWL for two years from LY
country:-), I started interesting in ham bands so I bought this radio to
explore them. Well as for AM listening the receiver do quite well, but for
ham band is worse. I decided to experiment with antenna to expand my
listening capabilities. So I came up to impedance question. I thought it is
very important. After your replies I try to do some random wire antenna test
first:-).

Thanks for your replies.
Your sincerely,
Edgar
73!

In article ,
says...
http://www.cqham.ru/trx/volna.html

cool looking radio...I didn't translate but looks like dual
conversion...serious rig.

At that era, (if my memory hasn't gone west) a standard receiving
antenna on *on this side of the pond* was a 400 ohm resister in series
with a 470 pf cap, that combo in parallel with a 1 uh inductor all in
series w/ a 200 ohm resistor...meaning it was purely resistive 300 ohms
at 7 mhz, capacitively reactive below and inductively reactive above.

Wx the comrades would have used the same standard I have no clue.