[pskmail] Re: Comparative tests with THOR22 and PSK250
- From: "John Douyere" <vk2eta@xxxxxxxxx>
- To: pskmail@xxxxxxxxxxxxx
- Date: Tue, 7 Oct 2008 14:15:47 +1100
Rein,
Great test. I can support this with anecdotal tests done from VK to ZL
where Thor22 was significantly more robust than the PSK modes. In fact
Thor11 which has about the speed of psk31 was even more robust with
100% copy even through normal QRM and QSB on 80M.
I will be interested to see how this Thor22 mode performs during the
storm season here which is coming soon. I hold great hopes that the
long FEC coding will do wonders for that. The other advantage is the
great tolerance to frequency offsets too.
I agree, a great mode for marginal conditions.
73s, John
On Mon, Oct 6, 2008 at 9:46 PM, Rein Couperus <rein@xxxxxxxxxxxx> wrote:
> I have done some testing on 10.148.5 with THOR22.
> The PI4TUE server is now switching to THOR22 on minute 4. I was able to
> compare
> PSK250 with THOR22 on the same channel, a 20 km path. The antenna at the other
> end seems to be damaged (20 dB down from its normal value).
>
> The method used was to send 3 pings each time and increase the power until no
> ping was
> damaged, and I repeated this scheme for both modes 20 times (yes, that is a
> lot of pings).
>
> PSK250 needed 40 Watts to produce an acceptable number of 3 undamaged pings
> in a row.
> THOR22 needed 2 Watts to do the same, a power factor of 20x.
>
> Of course THOR22 took 4x as long, and it needs 2x the bandwidth of PSk250.
> The free lunch still does not exist....
>
> But it shows the enormous potential for using THOR22 for pskmail on mediocre
> channels.
>
> 73,
>
> Rein PA0R
>
> --
> http://pa0r.blogspirit.com
>
>
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