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The Mini-Circuits SRA-2H comes to mind...............Level 17, which
requires 50mW of LO injection. Pete "Paul Keinanen" wrote in message ... On Tue, 15 Mar 2005 12:49:01 -0500, "Netgeek" wrote: It's my understanding (and I mean a fairly fuzzy understanding) that direct conversion has many benefits but is limited to lower bands (unless you're the military with a big budget)??? What are the trade-offs in doing a downconversion followed by DDS-based conversion? My suggestion of using a DDS for direct conversion in the 10-20 MHz range is based on the assumption that DDS chips running with 50-60 MHz clock frequency should be available at a quite a reasonable price, compared to similar chips running at 400 - 500 MHz, which would be required for direct synthesis in the VHF band. However, translating the whole band down to HF requires a strong down converter, especially due to the nearby strong signal broadcast band. Some flimsy NE602 type converter will not survive very well in such environment, but a high current preamplifier followed by a diode ring mixer might be a better converter. Paul OH3LWR |
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