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| To: | rsgb_lf_group@blacksheep.org, rsgb_lf_group@blacksheep.org |
|---|---|
| Subject: | Re: LF: TXing WSPR on 630m on a Raspberry Pi, Stefan in QRPPPP... |
| From: | IK1WVQ Mauro <ik1wvq@stmb.it> |
| Date: | Mon, 23 Mar 2015 19:20:55 +0100 |
| In-reply-to: | <551043CD.3090102@gmail.com> |
| References: | <4698D0522AFD45F896A41F2D16A2D831@AGB> <BC1061758A4D4230AA9719C22735EBF4@gnat> <19EEF7A6DD30462FA6ACC0F015DC9F52@AGB> <5509E3D5.90900@gmail.com> <55102D0C.8040405@gmail.com> <BLU177-W45F29A6AE9B885BD1168BCCF0D0@phx.gbl> <551043CD.3090102@gmail.com> |
| Reply-to: | rsgb_lf_group@blacksheep.org |
| Sender: | owner-rsgb_lf_group@blacksheep.org |
Hi Stefan,I use the RASPY from 2 years to produce WSPR and QRSS (I wrote a software to do this). Consider what the RF is produced by the internal fractional-divider "modulated" by a DMA sequence, to increase the resolution of the fractional_divider. The result is a NOT SO CLEAN spectrum !!! take a lock with a spectrum analyzer !! When used with lo power this is not a problem (my "PA" in HF is a 74AC541 all paralleled.. 450mW @ 30meters) My QRSS software can use only the fractional divider, without DMA ..The spectrum is VERY clean, but it is impossible to generate the WSPR tone .. only QRSS, CW and OPERA ... 73 de Mauro IK1WVQ |
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