OK - so if I understand it well one should run it without the reduction
unless there is a problem - a spur audible - and than switching on might
help ?
73 !
Jiri
OK1RI
On Mon, 5 Dec 2005, Ahti Aintila wrote:
Jiri,
My understanding is that the "spur. reduction" moves the spurious signal
generated by the DDS away from your listening passband. There is a good
probability that another spurious signal does not hit the same frequency.
73, Ahti OH2RZ
----- Original Message ----- From: "Jiri Sanda" <[EMAIL PROTECTED]>
Cc: <flexRadio@flex-radio.biz>
Sent: Monday, December 05, 2005 7:04 PM
Subject: Re: [Flexradio] Interesting behavior when connected to a dummy load
I do not understand ?
If the transmitted noise get so much worse when "spur. reduction" is on
why is it there at all ? What positive it does ?
73 !
Jiri
OK1RI
On Mon, 5 Dec 2005, Eric Wachsmann - FlexRadio wrote:
Jeff nailed this one on the head. The jumping around is because when
spur reduction is turned on, the radio hardware is only tuned every
~3.051kHz. We do the fine tuning using a software oscillator. Also
worthy of note is that we use an 11kHz IF. So what you are seeing is
the junk around DC on the left side of the spectrum.
Eric Wachsmann
FlexRadio Systems
