Just bought a lot of 5 pcs x ODC-15 on fleapay.
73, Alek
VK6APK
At 09:23 PM 21/02/2010, Alek Petkovic wrote:
>Great tip. Thanks Jim.
>
>I will do that with mine. Should be able to do it with the little
>FT-450 as well.
>
>Cheers, Alek
>VK6APK
>
>
>At 09:12 PM 21/02/2010, Jim Thomson wrote:
> >Date: Sat, 20 Feb 2010 09:56:54 -0600
> >From: "Cecil Acuff" <chacuff@cableone.net>
> >Subject: [Amps] Hotswitching issues 30s-1
> >
> >Hi Folks,
> >
> >I am having a problem with my solid state rig switching to TX and outputing
> >RF quicker than the amp is ready to process it.
> >
> >
> >
> >I have considered taking the key line to an external box that activates the
> >amp key line prior to sending PTT to the rig. Would work great for SSB but
> >not sure so good for CW.
> >
> >Am I making this harder than it should be?
> >
> >&&& YES. It`s a real simple fix.
> >
> >
> >My FT-1000MKIV is giving me a high SWR display because of the few
> >milliseconds of no load while waiting for the open frame relay in the
> >Collins to get in place. Once all is settled the reflected power is nil...
> >
> >&&& I use a P+B opto isolator on the output of both my MK-V`s
> >(ODC-15) is rated for 9-18 vdc input at 15 ma. Output side of it is
> >rated at 60 vdc at 3A CCS. (ODC-15A) is rated for 9-18 vdc input at
> >15 ma.Output side is rated for 200 Vdc at 1A CCS. The input to output
> >isolation is a whopping 4 kv. The 13.8 vdc to operate em is available on
> >the band data jack on the MK-V. The GRND that actually operates them,
> >comes from the same band data jack..Electronic grnd.
> >(internal yaesu switch transistor) The stock yaesu spst mech relay is SHUT
> >OFF, no longer used ! It`s useless anyway, since it takes 15 msecs to
> >operate (which just adds ANOTHER 15 msecs to ur already slow
> >collins relay). The P+B ODC-15 and A version... will operate in 100
> >microseconds. The release time on both opto`s is 750 microseconds.
> >No more hot switching ur collins on SSB.
> >
> >&&& the MK-V, in the menu.. for ``QSK`` has ADJUSTABLE 0-30 Msec
> >DIGITAL delay for CW only ! This feature allows the external amp to be
> >keyed..NOW... but RF does not come out of the MK-V for up to 30 msecs !
> >It does not truncate and dots +dash`s either. Being a digital
> >delay,it`s like
> >a buffer. You key the paddles in real time, but RF is delay by 0-30 msecs.
> >This one feature alone in the MK-V will give ur collins a 30 msec
> > HEAD START. This feature is for CW only.
> >
> >&&& I set mine for 30 msecs. I also use the P+B ( also made by opto22,
> >both available from Mouser)ODC-15A to key the vac relay`s in the HB amp
> >(which use a +120 vdc speed up voltage).. and also use em to key the
> >TR mech relay in the Drake L4B`s. As a side note, I converted the half wave
> >rectifier in the L4B. (+27 vdc relay supply) to a FWD.. = +63 vdc.
> >One 3 watt mof in one leg of the stock mech drake TR relay coil,and the
> >mech relay is WAY faster, still not qsk though.. just faster VOX ssb + CW.
> >
> >&&& You could also simply install a Gigavac GH-1 vac relay, etc, in the
> >30S1. The Gh-1 will operate in<2 msecs. BTW, the excellent GH-1 is
> >available in 12 vdc coil.. + also 26.5 vdc coil. The 12 vdc coil version
> >can easily be sped up with just 24+ vdc applied to it.. and correct
> >drop resistor.
> >
> >later... Jim VE7RF
> >
> >
> >
> >
> >
> >
> >Don't want to blow up the rig...
> >
> >Don't have this problem with my old Dentron Clipperton L...I guess it has a
> >faster relay.
> >
> >Thanks...
> >
> >Cecil Acuff
> >K5DL
> >
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>
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>
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