I haven't seen the 1/2 harmonic problem with my Flex-6700 or other
Flex radios I've tried here. But I should do some more investigation.
It probably exists, but I probably have enough separation for it not
to happen.
73
Ria, N2RJ
On Wed, Mar 21, 2018 at 7:45 PM, Jeff Blaine <KeepWalking188@ac0c.com> wrote:
> 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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>
>
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