That's terrific Jim. Very well explained as well.
I will implement it and the tx inhibit with the 10k resistor etc, as
soon at the devices arrive.
Cheers from sweltering Perth.
http://www.bom.gov.au/weather/wa/forecasts/perth.shtml
Alek. VK6APK
At 06:32 PM 24/02/2010, Jim Thomson wrote:
>Date: Wed, 24 Feb 2010 17:32:18 +0800
>From: Alek Petkovic <vk6apk@bigpond.com>
>Subject: [Amps] More on the 30S1 and MP MKV
>
>Hey Jim, with regard to what you wrote below a few days ago, I looked
>in the radio manual and the band data jack pinout as well as the
>linear connection guff on page 13.
>
>As I see it, you have the opto isolator connected to pin 1 (13.8V)
>and pin 2 (TX Gnd) on the 8 pin Band Data Jack. This means that the
>linear control is taken out before the relay and its RCA TX Gnd jack.
>
>I take it that this is what you have done.
>
>### YES. That's exactly how it works. The TX grnd on pin 2 is NOW
>... [ a few microseconds]. OK, now u have sunk the opto isolator.
>Opto takes 100 microseconds to operate. After 100 microseconds,
>sec of opto keys the amp.
>
>## The yaesu SPST mech relay is NO longer used ! It's too slow
>anyway, and has a 15 msec operate time. You can shut it off, via
> the slide switch. [ it has another use, see below !]
>
>## The internal yaesu switch transistor splits like a 'Y'... with one leg
>going in and out of that slide switch, then to RCA TX jack. Other leg
>of 'Y' goes directly to PIN 8 on band data jack.
>
>## presto, you just gave the relays in your amp an instant 15 msec
>head start. For cw, or qsk cw, I'd still set the yaesu menu delay for
>5-10 msecs... or XXX msecs.. something slightly longer than whatever
>speed ur amps vac relays operate at.
>
>## OK, this is all fine for sped up vac relays in ur amp, and even if slow
>mech relays used in amp, the yaesu MK-V 0-30 msec CW digital delay
>solves all hot switch problems. Now, what about VOX SSB.. and used with
>slow vac relays [G2,RJ2-B/C etc ?? Even sped up, the G2/RJ2-B/C is only
>7-9 msecs, and typ 3PDT mech relays are 15 msec ! Here's the fix.
> http://www.qsl.net/n1eu/Yaesu/MPAcom.htm shows the mk-v
>pin out. I use the MK-V TX INHIBIT LEAD. TX is inhibited when
>+13 vdc [pin 1] is placed via a 10 k /.25 w Resistor, onto TX inhibit lead,
>[pin 8] . You grnd pin 8 on TX, via the handy
>dandy TX grnd from rear panel
>RCA TX JACK !! Since that yaesu spst mech relay has a 15 msec op time, we
>now use it to apply a solid grnd to TX inhibit lead [pin 8] !!
>
>## End result is, on VOX sideband, that opto keys the amp NOW, slow relays
>in amp operate in 4-15 msecs. Meanwhile NO RF out of xcvr, until AFTER 15
>msec delay, since the TX inhibit lead, gets grnded..DEAD LAST. OK now we have
>this 15 msecs TX inhibit delay in the circuit.. all the time. ON
>CW.. the yaesu MK-V
>menu option [digital CW delay] MUST be set for at least 15 msecs..
>other wise
>you will truncate stuff. This total effect is now smooth qsk CW ,
>nothing truncated,
>and when on VOX SSB, Ist 15 msecs gets truncated, meanwhile NO
>hotswitching,
>and the amps slow relays have up to 15 msec to operate. An
>external 0-15 msec delay
>can also be used, if < 15 msecs is desired on VOX ssb.
>
>## On the yaesu 1000/D, as soon as u plug the din into the band
>data jack, TX inhibit
>is enabled !! [NO RF] . Grnd from yaesu RCA TX jack can now be
>used to grnd the TX inhibit
>lead, [after 15 msecs] and now RF flows from xcvr. No 10 k and
>+13 vdc used on the 1000/D
>inhibit setup. Also, NO 0-30 msec CW digital delay
>feature available on the 1000/D !!
>Opto still used. With SLOW t/r relays [6-15 msecs] no
>hotswitching on ssb/cw... BUT you
>WILL truncate the 1st 15 msecs. IF fast t/r relays used [1.8 to 5
>msec]... then don't use the
>TX inhibit scheme.
>
>
>later... Jim VE7RF
>
>
>
>
>
>My ODC-15s are in the mail form far away across the sea.
>
>73 and thanks,
>Alek. VK6APK.
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
http://www.qrz.com/db/vk6apk
http://www.qrz.com/db/vk6py
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|