Re: LF: 8.970khz

["henny van elst" <cpm@planet.nl>]

Hello Stefan,

it is just a sweeping carrier,

henny cpm

best 73s

----- Original Message -----

From: Stefan Schäfer

To: rsgb_lf_group@blacksheep.org

Sent: Wednesday, June 02, 2010 2:30 PM

Subject: Re: LF: 8.970khz

Wow, nice, congrats!

What was the mode in which you have transmitted? QRSS120?

You could try such a TV transformer. That may give you easily 30dB more power (depending on your losses), so you could reach 1,5km!?
If you cannot find such one, you could try a ferrite core out of an SMPS. But it will be a lot of work to wind that secondary coil and handle the HV!

Good luck!

73, Stefan

Am 02.06.2010 14:01, schrieb henny van elst:

Hi LF,

I also did some tx test on 8.970khz,using a power oscillator.

output on 8.9khz 40 volt.

than i take a transformer from the junkbox

40 volt input gave me 160 volt output.

I use my 137khz antenne (340PF).and i can hear my signal 0.5km away,

the reciever is the debeg portable with a datong up converter(28mhz) and a home made loop ,dameter 50cm.

will be continu,

 

Henny pa3cpm

best 73s

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