dBm MDS).
73,
... Joe, W4TV
> -Original Message-
> From: guyk...@gmail.com [mailto:guyk...@gmail.com] On Behalf
> Of Guy Olinger K2AV
> Sent: Wednesday, February 10, 2010 4:54 PM
> To: Joe Subich, W4TV
> Cc: d...@w3fpr.com; elecraft@mailman.qth.net
> Subject
; -Original Message-
>> From: Don Wilhelm [mailto:w3...@embarqmail.com]
>> Sent: Wednesday, February 10, 2010 1:06 AM
>> To: Joe Subich, W4TV
>> Cc: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 DSP AGC Question
>>
>>
>> Joe,
>>
gt; -Original Message-
> From: Don Wilhelm [mailto:w3...@embarqmail.com]
> Sent: Wednesday, February 10, 2010 1:06 AM
> To: Joe Subich, W4TV
> Cc: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 DSP AGC Question
>
>
> Joe,
>
> Can you elaborate your reasons
Really not surprised you use AFX and diversity all the time.
Lot of people all over the place have done that mono recording
comparison. We did it in college. My labor assignment at Berea
College was the Audio/Visual department. We were incessantly messing
around with stuff when not running a set
Guy, K2AV wrote:
>
> In a crowded room our brain neatly interprets stereophonic sound to
> separate out a single spatially diverse conversation from dozens of
> others at essentially the same level. In research using a monophonic
> recording of the multiple conversations from a single microphone
ly that
a more rounded curve might be beneficial.
73,
Dave AB7E
--Original Mail--
From: "Guy Olinger K2AV"
To: "Dave - AB7E" ,
,
,
Sent: Wed, 10 Feb 2010 08:58:00 -0500
Subject: Re: [Elecraft] K3 DSP AGC Question
Traversing the knee does not cause disto
to blur
> the distinction between different THR settings, but so what?
>
> Maybe somebody can educate me ...
>
> 73,
> Dave AB7E
>
>
>
>
> --Original Mail--
> From: "Don Wilhelm"
> To: "Joe Subich, W4TV" ,
>
> Sent: Wed, 10
Dave,
I believe you are asking for a more "rounded knee" on the AGC attack
curve. I don't know if that is feasible without a lot of work on Lyle's
part - he would have to answer. Right now, (as you noticed) the slope
of the AGC line between the threshold point and the point where the
hardwar
tend to blur the distinction between
different THR settings, but so what?
Maybe somebody can educate me ...
73,
Dave AB7E
--Original Mail--
From: "Don Wilhelm"
To: "Joe Subich, W4TV" ,
Sent: Wed, 10 Feb 2010 01:06:09 -0500
Subject: Re: [Elecraft] K3 DSP AG
n...@mailman.qth.net
>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Guy
>> Olinger K2AV
>> Sent: Monday, February 08, 2010 1:49 PM
>> To: nospam.li...@subich.com
>> Cc: elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K3 DSP AGC Question
>>
et
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Guy
> Olinger K2AV
> Sent: Monday, February 08, 2010 1:49 PM
> To: nospam.li...@subich.com
> Cc: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 DSP AGC Question
>
>
> It may be a dance, but hopefully careful inte
Hi Barry:
I was annoyed when I first read Lyle's post. It sounded like the right hand
didn't know what the left was doing. Really, why optimize the amplifier for 32
ohms and then only offer a 200 ohm headset for sale. But Lyle's further
explanation was reasonable and I probably overreacted.
I
I think some of us have reduced hearing, and crank up volume on
EVERYTHING, including TV. Ask your wives. It's probably not fair or
electronically practical to expect that kind of range in everything.
My Bose QC15's (plugged into headphone jack) would blow my head off if
I turned up the K3 AF pas
Hi, I use the 200 ohm Heil proset and even with the AF gain set to "LO" I
have no problem getting enough audio or distortion free audio. Either there
is a number of defective prosets or K3s out there because this is making no
sense at all.
Knut - AB2TC
Grant Youngman wrote:
>
>
>
> There are
>>
>> I was very disappointed to read your post. I purchased a Proset headset
>> directly from Elecraft when I bought my K3. According to Heil this headset
>> has an impedance of 200 ohms. Is that why I have to plug my headphones
>> into the rear speaker jack to get sufficient audio output from t
Ummm, if this is a real issue for some operators (and not a theoretical issue),
it would seem the problem could easily be resolved with an audio transformer.
RadioShack sells one for $2.99. They don't publish the specs in enough detail
to tell for sure, but it has a number of taps on the secon
Mike K2MK wrote:
>
> I was very disappointed to read your post. I purchased a Proset headset
> directly from Elecraft when I bought my K3. According to Heil this headset
> has an impedance of 200 ohms. Is that why I have to plug my headphones
> into the rear speaker jack to get sufficient audio
The Yamaha CM-500, recommended by quite a few here, is 120 ohms, right?
So cranking up the AF results is less than optimum operation?
73,
Mike, NF4L
Lyle Johnson wrote:
>> There IS something entirely separate with the headphone audio and HI-Z
>> headsets, high volume levels, maybe a sharp satura
I didn't mean to stir up yet another controversy. I use Heil Proset
with my K3 and they work just fine, as do my Yamaha CM500.
The K3 can easily drive high-impedance headphones.
My point was simply that *if* you have to crank up AF gain to the point
of distortion to get sufficient headphone vol
OK, except a lot of people have these 400 and 600 ohm headsets by
well-known makers. People are blaming it on everything from the phases
of the moon to the neighbor's dog. It would be good to have that
cleanly targeted.
What's the recommended workaround or is there a workaround? Maybe a
high imp
Hi Lyle:
I was very disappointed to read your post. I purchased a Proset headset
directly from Elecraft when I bought my K3. According to Heil this headset
has an impedance of 200 ohms. Is that why I have to plug my headphones into
the rear speaker jack to get sufficient audio output from them? W
> There IS something entirely separate with the headphone audio and HI-Z
> headsets, high volume levels, maybe a sharp saturation point, and
> mush, just haven't nailed it yet.
Note that the headphone audio path of the K3 is designed for 32-ohm and
lower headphone impedances. Higher impedance p
many ways.
>
> 73,
>
> ... Joe, W4TV
>
>
>
>
>> -Original Message-
>> From: elecraft-boun...@mailman.qth.net
>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyle Johnson
>> Sent: Monday, February 08, 2010 11:24 AM
>> To: elecraft@m
e Johnson
> Sent: Monday, February 08, 2010 11:24 AM
> To: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 DSP AGC Question
>
>
> Hello Joe!
> > Assuming that the threshold values have not changed in a major
> > way since Jack's measurements, would it be po
Hello Joe!
> Assuming that the threshold values have not changed in a major
> way since Jack's measurements, would it be possible to extend
> the range of threshold values - say to AGC THR=016 at about
> -80dBm (assuming 2 dB per step)?
>
Possible? Yes.
Likely? I don't know. There are
ent: Sunday, February 07, 2010 2:21 PM
> To: Guy Olinger K2AV
> Cc: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 DSP AGC Question
>
>
>
> > Some follow-on questions:
> >
> > 1) When you say "The DSP outputs a voltage to control the
> IF gain of
&
> Some follow-on questions:
>
> 1) When you say "The DSP outputs a voltage to control the IF gain of
> the radio." are you referring to VIFGAIN1 input to U3B on the RF
> board?
>
Yes.
> 2) Assuming so, is there anything that influences the voltage on
> VIFGAIN1 other than on behalf of the RF g
Thanks Lyle,
Some follow-on questions:
1) When you say "The DSP outputs a voltage to control the IF gain of
the radio." are you referring to VIFGAIN1 input to U3B on the RF
board?
2) Assuming so, is there anything that influences the voltage on
VIFGAIN1 other than on behalf of the RF gain pot, a
> ...Lyle would have to comment on whether the DSP
> AGC is developed before or after the IF gain is applied...
Assuming ATT and PRE are OFF, hardware AGC voltage begins to have an
effect on IF amplifier gain with a signal at the antenna in the region
of -60 dBm, plus or minus a few dB. The h
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