[CQ-Contest] ICOM 7610 & C31XR

[Jeff Blaine]

Anyone wanting to play with an active receiver and proximate transmitter 
would be VERY well served by picking up VJN's book as the FIRST step.  
Even if it's not a perfect match with this scenario, the overall lessons 
on understanding and testing coupling loss is worth 10x the price of the 
book.  Especially when the penalty for getting it wrong is a trip to the 
repair center for that shiny new now-deaf rig!

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com

On 21-Mar-18 10:11 AM, Terry Zivney wrote:
> The C31XR should not be a problem
> However, the ICOM 7610 may be.
> I have used TenTec radios and more recently an FTDX5000MPwith closely spaced monobanders (interleaved 10 & 15, for example)with no problems just with stubs on low power and just Dunestar600s with high power.
> BUT, this past weekend at N1UR for RDXC. Ed had monobanders withadjacent bands on separate towers. We had Dunestar 600s band passfilters. He had no problem with his FT1000Mk5 Field but I hadproblems with the new Icom 7610.  In particular, I needed thepreamp on 15 meters. But, that brought the overload light on.When the ICOM 7610 goes into overload, things fall apart prettyfast.  Also, you cannot use the DIGI-SEL to add some badly neededextra front-end selectivity when you want to use the preamps.
> BTW, the 7610 (and undoubtedly other radios with the samearchitecture) has a new type of second radio problem not foundin traditional superhet radios. When listening on 3505 you willhear the second radio on 7010.  The 1/2 harmonic!  Again, Dunestarsin line.  This is apparently due to the decimation process of theSDR.
> Good luck.
> Terry N4TZ
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