[eagle] Re: 70 cm Receiver IF Spurs - Problem Solved

Folks

The 70 cm Receiver spur problem has been solved. Click here

http://www.juanr.com/pages/hobbies/ham_radio/Eagle/CAN-Do_Noise_Troubleshoo ting.htm

for details.

This is very interesting. FWIW in the original SDX PSU design I had in San Francisco last year is an SMPS using the LM2672 device. These can be fitted with an AC coupled SYNC signal to override the internal default SMPS frequency. I selected 375kHz for my unit (6MHz divided by 16) to ensure its harmonics were outside the 10.7MHz IF passband. If the external SYNC fails the internal SMPS oscillator takes over.

Cheers, Howard