Re: FT1000 MK5 Field / Icom radio IF panadapter.
- Hi Marco,
pse see below
--- In email@example.com, "ccmarco2004" <ccmarco@...> wrote:
> Hi Gian,
> many thanks for detailed FT-1000 IF connection aid.
> I have just a question about v7.0 schematic :
> yesterday i was simulating the shifter network for 10 meter band
> version (R8: 1K, C9 : 10pF), and taking into account the
> propagation delay, 4.2 nS, and input capacitance, 2 pF, i have
> obtained a total group delay greater than expected (8.86 nS, 90
> degree @ 28.204 MHz).
OK. Going lower in frequency you will have a lower effect of group
> I also thinked that could be very difficult trim & fix exactly
> delay, due to parassitic parameter variance (thermal, aging, etc
Nothing is perfect in this world ... so you have to compromise ...
and adapt yourself and the circuit...hi
> From this aspect, is not much better the v6.0 configuration, with
> digital divider ?
> Am i wrong in some way ?
> Could you quickly explain me performance differences from SR v6.0
> and v7.0 ?
I havent done any measurements comparison between the two. The V6
certainly has a better quadrature generation.
I am working an a digital quadrature circuit where we have a divide
by 2 that will make possible to reduce the L.O. frequency
particularly going up to 28-30MHz band.
I will keep the group posted ... last night I got a fault on the
OPA ...one channel went bang !"!! hi
Going out for lunch with XYL, family and friend to celebrate out
37th wedding anniversary ...hi