[Elecraft] Front end FET of transverter blown with CW configured K2

[Mark_van_Wijk]

Hello Don,

The transverter uses one relay contact (K1) to disconnect the antenna input
from the Q3 input transistor during TX. I understand there will be a small
delay before the full 20W output power is available on the RX/TX relay to
the antenna.
Still I doubt it is capable of doing full break-in (tx-rx delay menu set at
0) with dots at 20wpm and not suffer from any timing issue. The antenna was
correctly connected.
 But then again I can and will certainly not try to repeat this error.

73
Mark, PA5MW



----- Original Message ----- 
From: "W3FPR - Don Wilhelm" <w3fpr at earthlink.net>
To: "Mark_van_Wijk" <pa5mw at home.nl>; <Elecraft at mailman.qth.net>
Sent: Friday, July 15, 2005 22:05
Subject: RE: [Elecraft] Front end FET of transverter blown with CW
configured K2


> Mark,
>
> Either you did not correctly describe the situation, but that transverter
> must work in CW mode too, and yes, it makes no difference whether the CW
dot
> paddle or the PTT switch is presses when in CW mode, a string of dots
should
> emerge.
>
> The XV50 transverter should be able to follow the T/R switching of the K2
> with no problem and no damage to the transverter, unless you have some
> strange connection on the antenna side of the transverter.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
>
> >
> > OK, guess Murphy forced me to screw up twice this week :))
> > So another mistake I would like to share with you all.
> >
> > Observation:
> > 20dB lost in receiver performance at your transverter, no C1 adjustment
> > possible (Elecraft XV50 kit)
> >
> > Cause:
> > Q3 PHEMT ATF34143 defective
> >
> > How did I manage that:
> > K2 configured in CW , with no RX delay and Iambic keyer set in the menu.
> > The PTT line from your mic is also the 'dot' line for your internal
keyer.
> > When pressing the mic's PTT in CW mode, the K2 starts sending dots in
full
> > BK.
> > Your transverter will try to follow the quick TX/RX switching , but
since
> > there is also little or no RX delay, the front end FET will go to
heaven.
> > Normally you would not press the mic while in CW mode, but trying
> > to locate
> > my other mistake (max ALC reading in SSB) I
> > Both my A and B version K2's do this.
> > Again human error here, but we're learning :))
> >
> > '73 Mark, PA5MW
> >
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