- Icom 756 pro ii cable pdf#
- Icom 756 pro ii cable mod#
- Icom 756 pro ii cable mods#
- Icom 756 pro ii cable software#
Would I recommend this filter mod to anyone with an Icom IC-756-Pro2, you bet!! I suspect now that VHF IF filters are getting narrower, all radios will have narrower filters in the future so why buy a new one. I feel like I'm listening to a radio built many years ago that had a narrow front end and not like todays wide front end upconverted IF radios that have wide VHF IF filters. After an hour of listening I noticed the usual pops, crackels and wines are gone from normal listening. What I did notice is a much quieter radio. That is overstated as it is really difficult to hear any differences.
INRAD claims AM and wide SSB will be degraded somewhat. I did not take any measurements afterward and didn't really know what to expect other than have better IMD numbers. The Icom worked without any issues after the mod.
The mod took me a total 2.5 hours taking my time. You have to cut a trace and put small connectors on mini-coax cable and solder them onto small pads. This will be a difficult mod for those who are not used to small space work and working with small connectors but not impossible. with self-gluing capton tape near MP1.I purchased the filter from The DX Store and they had free shipping on the filter. The longer one (TX/+12V) should be fixed, e.g. For TX/+12V and RX/RF use some short and isolated wires. Both ground connections can be re-used from the SO-239 solder point. The relais (use one w/o free wheeling diode) must be mounted on the top side because there’s not enough room underneath (metal sheet cover of the tuner). Also, be very cautious with the three printed flex cables. For removing the CONTROL UNIT one has to de-solder both SO-239 connectors from the PCB. Remove the top lid, detach the speaker cable and remove a second internal shielding lid. The best place for this patch-relais is directly on the CONTROL UNIT. For here a tiny reed-relais can add up several tens of dB decoupling. adding a short circuit for the ports in off-conditions. But there’s also a fourth method iv) that is both most effective and simple:Īs known from VHF/UHF antenna relais technique one can achieve huge decoupling values when earthing unused pins, i.e. Their cure effect, and worse their side effects too, are hard to estimate. A third method iii) is to increase the input damping of the final amp (there’s already a 3R-pi input attenuator). Two alternatives curing this ICOM implied design flaw are i) replacing the antenna relais and ii) replacing the decoupling diode by a better one. Even the antenna tuner changes the phase relation and can cause several go/no-go situations. When one of the attenuators is on (for sure not the default for 6m!) the decoupling might be ok. Depending on part tolerances the IC-756 oscillates on 6m or does not. On 6m the decoupling of both the antenna relais and the decoupling diode D131 is no more sufficient. Hereafter the RX path joins the TX small signal route via IC151 to the final amp. This is caused by a loop-back from the antenna relais (TX/RX decoupling) via the RF board, passing the persistently switched input attenuator (2 relais) and the RX/TX isolator diode D131. Some IC-756PRO (-2) tend to oscillate on 6m. Icom IC-756 PRO II (IC 756 PRO II IC756PROII) technical specifications Icom IC-756 PRO II (IC 756 PRO II IC756PROII) technical specifications :
Icom 756 pro ii cable mods#
Icom IC-756 PRO II (IC 756 PRO II IC756PROII) TX mods 100 Khz - 60 MHz Icom IC-756 PRO II (IC 756 PRO II IC756PROII) TX expand on IC 756PROII #23 EU models Icom IC-756 PRO II (IC 756 PRO II IC756PROII) 6M oscillation problem Mods for Icom IC-756 PRO II (IC 756 PRO II IC756PROII) : Schematics for Icom IC-756 PRO II (IC 756 PRO II IC756PROII) :
Icom 756 pro ii cable pdf#
PDF Adjusments Procedures Manual with schematics for Icom IC-756 PRO II (IC 756 PRO II IC756PROII) : PDF User Manual for Icom IC-756 PRO II (IC 756 PRO II IC756PROII) : Icom IC-756 PRO II Instruction Manual
Icom 756 pro ii cable software#
Programming software for Icom IC-756 PRO II (IC 756 PRO II IC756PROII) : Programming interface schematics for Icom: Icom IC-756 PRO II (IC 756 PRO II IC756PROII)
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