[Amps] Hotswitching 30-S1 and MK-V... the fix.

[Alek Petkovic]

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 at 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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