Re: LF: Re: WSPR2-15 600m

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Subject:	Re: LF: Re: WSPR2-15 600m
From:	g3zjo <[email protected]>
Date:	Sun, 17 Feb 2013 12:29:59 +0000
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Hi Marcus

Thanks for the reply.

Yes I am aware of Stefan's TA results on LF.

I was particularly referring to 600m. Here I see the same distance being covered covered between 2 stations on WSPR2 and WSPR15 within minutes of each other, WSPR15 reports do infer that they are 'looking down further', but WSPR2 is reporting stronger signals.

I also have a suspicion that low ERP takes advantage of the shorter periods of enhancement on 600m and extended times suffer by comparison.

73 Eddie

On 17/02/2013 12:08, Markus Vester wrote:

> Does WSPR15 really achieve anything that WSPR2 does not?

oh yes! The SNR limit of wspr-2 is about -29 dB in 2.5kHz whereas wspr-15 can look down to -38 dB. If you browse the database for LF last night and sort by distance, you'll find many TA decodes for DK7FC, almost all of them with SNR values well into the 30ies.

It's certainly worthwhile to invest in frequency stability, even more so if you are running low ERP.

Best 73,

Markus (DF6NM)

----- Original Message -----
From: g3zjo

To: [email protected]

Sent: Sunday, February 17, 2013 11:33 AM

Subject: LF: WSPR2-15 600m

Hi LF

I am not stable enough, or is it the radio, to run WSPR15 on 600m.

For those stations that can / do it would not be easy to run WSPR2 and
WSPR15 at the same time, within those limits is anyone seriously
studying the results.

Does WSPR15 really achieve anything that WSPR2 does not?

Eddie G3ZJO

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