Jim --
Any hum associated with the decrease in
volume/sensitivity (by the way, is it audio volume or
sensitivity that diminishes)? I once had a Knight kit
that did that when it was new -- the culprit was a dc
filter that had a capacitor breaking down after
warm-up (guess it diminished the voltage fed to the
audio drive (in this case the grid of a 6be6)). And
-- as the audio dropped there was a slight 120 cycle
hum in the background. The technical support guy at
Allied knew right away when I described the symptom
and sent me a replacement electrolytic. Of course
this whole thing took about five or six weeks by snail
mail and parcel post.
Tom
--- Jim Reid <jimr.reid@verizon.net> wrote:
> Hi,
>
> Am using my "old" Corsair II while I wait patiently
> for
> am Orion on order.
>
> Have been noticing that the rcv signals grow weak
> after a bit of time. A couple of quick "pops" on
> the
> PTT button, and bingo, back up comes the rcv'd
> signal. There is no linear in use, nor any
> connection
> to a linear and its' T/R relay through which both
> rcv
> and xmit signals would pass.
>
> In looking through my old Corsair manual, it seems
> all
> the T/R switching done using several diodes, thus
> the
> smooth and fast QSK. However, I do hear a relay
> clicking which the PTT button is pressed -- I assume
> this is the relay which would actuate a linear were
> I
> using one. But, certainly the rcv signal does not
> pass through that relay.
>
> So what is going on? Or is there a relay someplace
> in there
> through which the rcv signal is passing which whose
> contact
> can be, at least briefly, cleared by a couple of
> actuations
> of the PTT switch, or CW key?
>
> Seems odd that a diode in the T/R switching arrays
> would
> fault in such a way that the symptom I have would
> occur,
> but who knows?
>
> 73, Jim KH7M
>
>
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