ADAM'S ALLEY

Transceiver Reviews by Adam Farson, VA7OJ / AB4OI

Adam Farson is a retired telecom engineer who enjoys evaluating the latest radio technology.

His reviews are highly technical.  He coordinates closely with Rob Sherwood and their feedback to the transceiver OEMs helps improve the radios we all use.

 

Adam has especially focused his attention on ICOM transceivers and has full test reviews on:

 

IC-7000 / IC-718 / IC-7000 /IC-7200 / IC-7410 / IC-756Pro/Pro2/Pro3 / IC7600 / IC-7700

IC-7851 / IC-9100 / IC-R7100 / IC-R8500 / ID-5100

 

Adam has devised a special testing medology using "NPR".

NPR stands for "Noise Power Ratio" and uses notched noise to evaluate dynamic receiver performance.

 

Before diving into reading Adam's transceiver tests and reviews, it is a good idea to first read about the test method he is using.

 

See:  Noise Power Ratio (NPR) Testing of HF Receivers

 

For many of us, the complexity of Adam's NPR test is beyond our technical understanding.  I'm sure the engineers will have no problem understanding it.

 

At the end of the technical part, Adam also explains his results in clear English (for the  rest of us).

 

EXAMPLE (IC-7851) :  

DR3 (3rd order IMD dynamic range, Test 4) is 15 - 20 dB higher than that of earlier designs.  Again, this is among the highest I have ever measured in a superhet.  The serious contester or DX'er will no longer be handicapped by IMD products or phase noise in his own receiver.

 

 

NOTE:  Both Adam Farson and Rob Sherwood are now including TX phase noise as part of their transceiver reviews.  Their test results are being coordinated with those of ARRL Lab.  HOPEFULLY this will launch a new age of clean transmitters.