[Elecraft] RE: More Audio OUTPUT please: The ongoing saga...

Tue Sep 24 23:51:05 2002

My guess is that it's not an AGC problem. I can listen to a signal on SSB
that is 10Db over S-9 and its still to low.

I'll try the AGC thing but don't think so.

73
Jim W7RY

----- Original Message -----
From: "k4zm" <[email protected]>
To: "Jim W7RY" <[email protected]>
Sent: Tuesday, September 24, 2002 8:36 PM
Subject: Re: [Elecraft] RE: More Audio OUTPUT please: The ongoing saga...

> Turn off you AGC by holding down Pre/Att and AGC switches for a coupel of
> seconds and then check your audio level... Your agc maybe too tight...
> 73
> Jim Younce K4ZM
> ----- Original Message -----
> From: "Jim W7RY" <[email protected]>
> To: <[email protected]>; <[email protected]>
> Cc: <[email protected]>; <[email protected]>
> Sent: Tuesday, September 24, 2002 10:30 PM
> Subject: Re: [Elecraft] RE: More Audio OUTPUT please: The ongoing saga...
>
>
> > I too have low audio. (1st time I have weighed in on the issue).
> >
> > Thanks and 73!
> > Jim W7RY
> > K2-#2740
> >
> > ----- Original Message -----
> > From: "Bruce Thompson" <[email protected]>
> > To: <[email protected]>
> > Cc: <[email protected]>; <[email protected]>
> > Sent: Friday, September 13, 2002 7:39 PM
> > Subject: [Elecraft] RE: More Audio OUTPUT please: The ongoing saga...
> >
> >
> > > I have had a big problem with my audio output.  (I made were several
> > > posts about 6 weeks ago.)  I am trying to use the K2 mobile and the
SSB
> > > audio was not high enough to use it in this application.  (CW is OK)
Too
> > > much road, wind, air conditioner,background noise.  I've spent quite a
> > > bit of time on this issue.  I now have a way to use it in the truck
with
> > > the RF and AF gains on full blast with the preamp on with an external
> > > speaker about 2 feet from my head:
> > >
> > > Removed C180 in the 2nd xtal filter section.
> > >
> > > Rewound T7 for 20:5 rather than 13:3 turns ratio.  The newer units
> > > should already be at 20:5.
> > >
> > > Replaced R1 with a 33k resistor, from its original 51k.  This is
because
> > > the voltage on the 8 volt regulator was 8.4 volts, not 8.0.  According
> > > to Elecraft, this was reducing the RF gain.  Changing out the resistor
> > > gave it a little more gain.  Note that it is relatively easy to
measure
> > > the regulator voltage with the top cover off so it should be simple to
> > > check.
> > >
> > > The rig/ant combination does work.  Antenna is a Stealth II
screwdriver
> > > with the 4" coil and a 4 foot whip.  Good signal reports and some DX.
> > >
> > > There was one more suggestion to replace one of the resistors in the
> > > preamp stage to get a little more gain but can't seem to find it in my
> > > notes right now.   I have not done that yet.
> > >
> > > I also think the antenna has a lot to do with the signal level and
thus
> > > the available audio level but I haven't experimented with it too much.
> > > (Have a 2 element Fluid Motion portable beam on order) I also agree
with
> > > the comments of Mike AD5IU with the only one exception being my K2 is
> > > one of the earlier units and it does exhibit the audio (should rename
it
> > > gain) problem.
> > >
> > > Tom (N0SS) and Gary, I am more than willing to help out finding the
> > > problem.  I have been on a long business trip so I have been away from
> > > the rig/test equipment for a while.  I have been considering buying
> > > another SSB board to see if the newer board/crystals make a difference
> > > or if there is something wrong with my board somehow.  I get to build
> > > something else and I'm sure I could sell a completed board for about
the
> > > cost of the kit.  That might be better than trying pull components on
my
> > > current board.  I might end up with nothing!  Tom and Gary, let me
know
> > > how I can help out.  If you want me to ship you my SSB board, K2, etc.
> > > let me know and we can work something out.
> > >
> > > On a side note, after my last "low audio" set of posts, I received a
lot
> > > of private email saying something to the effect of, "I also have low
> > > audio.  Please let me know what you find out..."   I personally think
> > > there is something going on here that is more than a single instance.
I
> > > had to go through the "you built it wrong", "you aligned it wrong",
"you
> > > connected it wrong","you're using it wrong" ,"you listened to too much
> > > rock music"...    No, it's not built wrong.  No, I have never had a
> > > problem with badl toroid leads.  No, the alignment is just fine (via
> > > Tom's noise source and spectrogram), Yes, I am using an external
> > > speaker.  Yes, I have the preamp on, etc.  No, I didn't listen to too
> > > much rock music.  (I grew up in Iowa and rock music didn't get to my
> > > home town until the late 80's.)  It is encouraging to see Tom and Gary
> > > looking to see if there is a bigger issue here and I want to support
> > > that effort.
> > >
> > > Bruce "Not an unhappy customer, I use it all the time, just want to be
> > > able to hear"  KG0SH
> > >
> > > K2 SN 549 all options including the KPA100 except the 160m option.
> > >
> > >
> > >
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