Quote:
Originally Posted by gewecke
A good way to solve the intermod issue,would be to pick a triple conversion receiver.
Check the specifications while shopping. Most that are intermod-prone are only dual conversion.
N9ZAS.
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That's actually kind of a fallacy. If all other things are truly equal then, theoretically, a well designed triple conversion receiver should have some advantages over a double conversion receiver in terms of some types of interference rejection (primarily image rejection). However, simply put, a well designed double conversion receiver can out perform a triple conversion receiver of lesser design quality.
In general, the number of conversion steps in a receiver does not always provide the best indicator of interference rejection performance, especially in consumer quality receivers.
The GRE PSR500/600 is a triple conversion receiver and is well known to experience significant overloading and intermodulation issues. So, if I were you I would treat the conversion steps in consumer grade receiver gear with a bit of the old "grain of salt" rule. That being said, pretty much all (I think actually ALL) modern digital capable trunking scanners out there now are triple conversion so the point is kind of moot.
Videobruce - you might try looking into the choices at
WiNRADiO Communications - The future of radio. if you are not needing to go mobile or portable. The 315 series should offer very good performance plus P25 decode but they don't yet have a trunking package for them. The lower cost mainstream 305 series still look like they should offer better interference rejection than your typical consumer scanner and they do offer a trunking package as well as a P25 decoder for those units. The trunking package (control software, I believe) does not yet handle 9600 baud P25 systems but, according to the description, this is in the works and will be added at a later date. These may be pricey options but they still may be the closest overall solution for you.
-Mike