K3 - diversity reception question

[oe9fwv]

Maybe this has been discussed before, if so please forgive me...
When I switch on the Sub receiver listening on the headphones, the right
channel disappears for a short instance, then comes back but with a slightly
lower volume than the left (main RX) channel. Is this intended?
I use the Sub knob as balance pot. I have shared Ant 1 with the Sub
receiver.

73! de Werner OE9FWV

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[wayne burdick]

Hi Werner,

Use BSET to see what the sub receiver's PRE and ATTN settings are. They
are independent of the main receiver's settings. They are also saved
per-band.

73,
Wayne
N6KR

On Jan 30, 2009, at 8:32 AM, Dr. Werner Furlan wrote:

> Maybe this has been discussed before, if so please forgive me...
> When I switch on the Sub receiver listening on the headphones, the
> right
> channel disappears for a short instance, then comes back but with a
> slightly
> lower volume than the left (main RX) channel. Is this intended?
> I use the Sub knob as balance pot. I have shared Ant 1 with the Sub
> receiver.
>

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[oe9fwv]

hi Wayne,

thank you for your answer and suggestion but - the difference in volume is
much less than 10db. When I switch from Main to Sub the sound in my
head shifts about 10 or 20 deg to the left. With the balance potentiometer I
can correct it of course. First I thought my ears are different, but if I change
the orientation of my headphones it is shifting to the other side. The main
receiver is definitely a bit louder than the sub RX. (but less than 10dB PRE
or ATT)
I have been listening with the stock 2.7 filters in Main and Sub btw.


73! de Werner OE9FWV


wayne burdick schrieb am 30 Jan 2009 um 8:41:

> Hi Werner,
>
> Use BSET to see what the sub receiver's PRE and ATTN settings are. They are
> independent of the main receiver's settings. They are also saved per-band.
>
> 73,
> Wayne
> N6KR
>
> On Jan 30, 2009, at 8:32 AM, Dr. Werner Furlan wrote:
>
> > Maybe this has been discussed before, if so please forgive me...
> > When I switch on the Sub receiver listening on the headphones, the
> > right
> > channel disappears for a short instance, then comes back but with a
> > slightly lower volume than the left (main RX) channel. Is this intended?
> > I use the Sub knob as balance pot. I have shared Ant 1 with the Sub
> > receiver.
> >
>
> ---
>
> http://www.elecraft.com
>
>
>

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[Joe Planisky]

Maybe you have (or need?) different filter gains between the main and  
sub filters?

73
--
Joe KB8AP

On Jan 30, 2009, at 8:32 AM, Dr. Werner Furlan wrote:

> Maybe this has been discussed before, if so please forgive me...
> When I switch on the Sub receiver listening on the headphones, the  
> right
> channel disappears for a short instance, then comes back but with a  
> slightly
> lower volume than the left (main RX) channel. Is this intended?
> I use the Sub knob as balance pot. I have shared Ant 1 with the Sub
> receiver.
>
> 73! de Werner OE9FWV

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[wayne burdick]

Dr. Werner Furlan wrote:

> hi Wayne,
>
> thank you for your answer and suggestion but - the difference in
> volume is
> much less than 10db.

Using the MAIN antenna for the subreceiver switches in a -3 dB pad,
which is required to split the path to the two receivers. This results
in about a 3 dB signal attenuation in both. This may be part of what
you're hearing.

There also may be slight differences in overall path gain between the
two receivers, even when configured identically. Here are some
contributing factors:

1. band-pass filter alignment and losses
2. 1st mixer loss
3. crystal filter loss
4. crystal filter ripple
5. physical alignment of the SUB AF control (when used as main/sub
BALANCE)
6. ears

It's quite plausible that overall receive gain could, therefore, differ
by a few dB between main and sub receivers.

You could use the K3's built-in true-RMS AF voltmeter functions to
determine the exact amount, on each band (AFV/dBV).

73,
Wayne
N6KR

---

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[oe9fwv]

hi Wayne,

wayne burdick schrieb am 30 Jan 2009 um 13:29:

> Using the MAIN antenna for the subreceiver switches in a -3 dB pad,
> which is required to split the path to the two receivers. This results in
> about a 3 dB signal attenuation in both. This may be part of what you're
> hearing.
>
> There also may be slight differences in overall path gain between the two
> receivers, even when configured identically. Here are some contributing
> factors:
>
> 1. band-pass filter alignment and losses
> 2. 1st mixer loss
> 3. crystal filter loss
> 4. crystal filter ripple
> 5. physical alignment of the SUB AF control (when used as main/sub
> BALANCE)
> 6. ears
>
> It's quite plausible that overall receive gain could, therefore, differ by
> a few dB between main and sub receivers.
>
> You could use the K3's built-in true-RMS AF voltmeter functions to
> determine the exact amount, on each band (AFV/dBV).

I think I need some help with this.
I have connected a noise gernerator to my ANT1 and I see AFV floating
between 622 and 702 with SUB engaged,  and 1578 and 1719 without SUB.
(this was on 3.670 kHz)

73! de Werner OE9FWV




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[oe9fwv]

hi Jo,

you are right I can compensate for the volume loss with the filter gain on
the SUB RX.  But it takes 8 dB to hear the signal in the middle...


73! de Werner OE9FWV


Joe Planisky schrieb am 30 Jan 2009 um 13:26:

> Maybe you have (or need?) different filter gains between the main and  sub
> filters?
>
> 73
> --
> Joe KB8AP
>
> On Jan 30, 2009, at 8:32 AM, Dr. Werner Furlan wrote:
>
> > Maybe this has been discussed before, if so please forgive me...
> > When I switch on the Sub receiver listening on the headphones, the  right
> > channel disappears for a short instance, then comes back but with a
> > slightly lower volume than the left (main RX) channel. Is this intended?
> > I use the Sub knob as balance pot. I have shared Ant 1 with the Sub
> > receiver.
> >
> > 73! de Werner OE9FWV

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[wayne burdick]

This is about an 8 dB drop. The first 3 dB can be attributed to the
fact that main and sub are now sharing the main antenna path (the
splitter gets turned on). The other 5 dB must be due to some
combination of the other factors I listed:

> 1. band-pass filter alignment and losses
> 2. 1st mixer loss
> 3. crystal filter loss
> 4. crystal filter ripple
> 5. physical alignment of the SUB AF control (when used as main/sub
> BALANCE)

Are the crystal filters in the two receivers matched? If not, you could
be using a filter with a lot of loss in the sub vs. the main at a
particular bandwidth.

I'll be out of town for a few days, so you might want to check with
Gary about how to isolate which of the above is causing the loss. You
can try different bands and filters, for example.

Wayne
N6KR

On Jan 31, 2009, at 3:06 AM, Dr. Werner Furlan wrote:

> I think I need some help with this.
> I have connected a noise gernerator to my ANT1 and I see AFV floating
> between 622 and 702 with SUB engaged,  and 1578 and 1719 without SUB.
> (this was on 3.670 kHz)
>
> 73! de Werner OE9FWV
>
>
>
>
> --
>  Foreploy: Any misrepresentation about yourself for the purpose of
>  obtaining sex.
>
>
> Email powered by Pegasus Mail free at <http://www.pmail.com>
> Homepage: <http://www.qsl.net/oe9fwv/>
> Fone [phone]
> Fax [phone]
> Mobile [phone]
> Elecraft K2 #5203 K3 #656
>
>
>
>

---

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[oe9fwv]

Wayne,

wayne burdick schrieb am 31 Jan 2009 um 9:33:

> This is about an 8 dB drop. The first 3 dB can be attributed to the
> fact that main and sub are now sharing the main antenna path (the
> splitter gets turned on). The other 5 dB must be due to some
> combination of the other factors I listed:
>
> > 1. band-pass filter alignment and losses
> > 2. 1st mixer loss
> > 3. crystal filter loss
> > 4. crystal filter ripple
> > 5. physical alignment of the SUB AF control (when used as main/sub
> > BALANCE)
>
> Are the crystal filters in the two receivers matched? If not, you could be
> using a filter with a lot of loss in the sub vs. the main at a particular
> bandwidth.

no - they are not. I have -0.89 and -0.81 -> both set to -0.85.

I'll discuss this with Gary like you said.

tnx,

73! de Werner OE9FWV


73! de Werner OE9FWV

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