Re: FT1000 MK5 Field / Icom radio IF panadapter.
- 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 comparator
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).
I also thinked that could be very difficult trim & fix exactly this
delay, due to parassitic parameter variance (thermal, aging, etc
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 ?
--- In firstname.lastname@example.org, "Giancarlo" <i7swx@...> wrote:
> --- In email@example.com, "ccmarco2004" <ccmarco@> wrote:
> > Hi to all,
> > i'm new of this group, i'm awaiting for two, just ordered,
> > kit, one v6.0 and one v7.0.
> > I was wondering if someone could give me any tip regarding the
> > of these circuits as IF panadapter for the FT-1000 MKV Field
> > MHz IF and Icom's 9.015 Mhz IF.
> > My intent is to modify circuits input filters, shift network
> > v7.0)and Xtals to obtain proper tuning on center IF freq.
> > Maybe could be also good to use an IF input preamplifier to feed
> > SoftRock input to avoid IF chains loading.
> > For Yaesu seems fine to use 8.192 MHz Xtal with SR v7.0 as seems
> > fine to use 9 MHz Xtal for Icom.
> > I could be good also to use 36 MHz Xtal with SR v6.0 with 4x
> > Has anyone already done something like that ?
> > Thanks in advance.
> > Marco, IW2NYX.
> Hi Marco,
> my comments to your question are only "suggestions" as I have not
> tried anything.
> As you said you will have to change the xtal for the proper
> IF selected. For SR V7 you will need a xtal cut for the yaesu
> or icom 9.0+ IF; for this you will have to adjust the phasing
> capacitor's value. For the SR V6 you will need a xtal IF x 4.
> I suggest you not to have any filter at the SR input.
> For the Yaesu FT1000MK you should attach the SR at the secondary
> T2001 in the Noise Blanker IF amplifier. If not enough output to
> drive the SR you can attach it to T2002 secondary output.
> I do not know what is the impedance at these points. While
> the nd Mixer and 2nd IF in the FT1000MP I "discovered" (measure
> guessing) some transformers secondaries where around 200 ohm (???).
> To avoid mismatching problems, you should add a JFET buffer (J310
> BF245) with a 47 to 100 ohm R and a parallel C of 0.1uF R between
> the source and the SR input primary transformer (one side of it to
> With this solution you will monitor all signals passing througfht
> the 70 MHz 1st IF roofing filter, although being at 8 MHz.
> Regarding ICOM transceivers I do not know which model you are
> thinking of. The IC756, IC775 and IC765 are quite similar at the
> conversion. You may try to connect the SR, with input JFET buffer
> connected at the 2nd IF roofing filter FL23. If not enough gain
> you may replace the JFET buffer with a DGM cascode amplifier or
> a grounded gate JFET ampolifier following the JFET buffer and
> driving the SoftRock.
> These are ideas that may work right away ... please post any "try
> and buy" you may experiment.
> For additional discussions in Italian you can send me direct mail.
- --- In firstname.lastname@example.org, "ccmarco2004" <ccmarco@...> wrote:
>The SDR input is in parallel with the used filter. I offset the SDR
> Hi Lyle,
> good news because i also own a IC-706.
> some questions :
> - do you feed the SDR by mean of empty filter slot input line ?
> - or is the SDR input in parallel with the used filter ?
> - did you notice injected noise to 706 RXed signal when using SDR
> connection ?
local oscillator so that the center of the filter passband came out
at 13 kHz on the Winrad display. That kept the local oscillator out
of the passband, and I didn't notice any injected noise. But a FET
follower is a good idea because it would reduce the loading of the
IF circuit and would also provide some reverse isolation.
- 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