ICom 706mkii HSend, VSend through 13-pin ACC port?

Discussion in 'Working Different Modes' started by KE0KDQ, Jul 16, 2019.

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  1. KE0KDQ

    KE0KDQ Ham Member QRZ Page

    Hi folks,

    I'm using an XGGComms interface purchased through EBay to link FLDigi to my 706mkii (non G version).

    PSK31, RTTY and other alt modes work great on HF. I can't get the PC to key the rig in 2M mode, though. Looking at the 13-pin ACC port the interface hits the rig with, it appears there are two different pins (VSEND and HSEND) that key the rig based on which mode the radio's in (HF/6M or 2M).

    Is there a setting in FLDigi to switch which pin is grounded for PTT/keying the rig based on which band you're in?

    Here's the link to the manual's description of the pinout, on PDF page 9 of 64: http://www.icom.co.jp/world/support/download/manual/pdf/IC-706MK2.pdf
  2. AA4PB

    AA4PB Ham Member QRZ Page

    I think that you may be able to jumper VSEND and HSEND together so that it will key either side automatically. It looks like you also may be able to use the RTTY jack's PTT to key either side. My "G" version has a VSEND SEL menu that will configure the HSEND and VSEND functions but I don't think that is available in the non "G" version.
    KA0HCP likes this.
  3. KE0KDQ

    KE0KDQ Ham Member QRZ Page

    Anyone have any idea if AA4PB's idea of jumpering VSEND and HSEND will work?

    Should I do this in the radio, in the cord?

    Is there a way to do this in the software? Using FLDIGI for now but also have HR Deluxe if that helps.
  4. K7GQ

    K7GQ Subscriber QRZ Page

    Wouldn't jumpering HSEND and VSEND cause both the HF and VHF transmitters to transmit at the same time? I don't think this is what you want. Try a different interface cable for VHF.
  5. DO8SN

    DO8SN Ham Member QRZ Page

    Hi KE0KDQ

    Did you get this solved?

    got the same issue with my MK II.
    I jumpered HSEND / VSEND (Pin 3 / 7) - no effect at all.
    keying the radio on HF still works fine - no TX on 2m.

    Any further Ideas?

    Best, DO8SN
  6. AA4PB

    AA4PB Ham Member QRZ Page

    For the MkiiG, look at page 54 of your manual. Item 30 "VSEND SEL" sets how the ACC socket works.

    "on": VSEND is for 144/430, HSEND is for HF/50 MHz
    "U only": VSEND is for 430 MHz; HSEND is for HF/50/144 MHz
    "off": VSEND is not used; HSEND is for all bands.
    HK3PQI likes this.
  7. AA4PB

    AA4PB Ham Member QRZ Page

    No. They are not independent radios. It will only transmit on the band and mode that you have selected on the front panel. If you ground VSEND while the radio is set to an HF band then nothing happens. I think the VSEND vs HSEND thing is more about keying an external amp. If, for example, an HF amp ptt line is connected to HSEND then when you have the radio on 2M or 440Mhz it won't key the HF amp.
    HK3PQI likes this.
  8. KE0KDQ

    KE0KDQ Ham Member QRZ Page

    Nope still stuck on this one.
  9. AA4PB

    AA4PB Ham Member QRZ Page

    So if you ground VSEND then the radio keys on 2M but if you ground both VSEND and HSEND it doesn't key on 2M? If that's the case then you'll probably have to wire in a toggle switch to select which line gets keyed by the interface.
  10. AA4PB

    AA4PB Ham Member QRZ Page

    I've looked at some Icom manuals on the Internet. The original IC706 only had "send" on pin 3. The IC706mkII had "Hsend" on pin 3 and "Vsend" on pin 7 but had no menu item to set how they functioned. Hsend worked with the HF side and Vsend worked with the VHF side. The IC706mkIIg added the menu item to set how they functioned. I recall seeing some interfaces for the mkII (not g) that grounded both Hsend and Vsend together to key either side of the radio, depending on whether is was set on an HF band or a VHF band. If that doesn't work then the other option would be to key the PTT pin on the microphone connector since it obviously will key either side of the radio. Optionally you could add a SPDT toggle switch to switch the PTT from the interface between Vsend and Hsend.

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