voice heard on ext speaker using monitor

[WADE JONES]

While using the monitor feature to listen to my audio, I had my head phones on in transmit. The ext speaker doesn't cut out during transmit. This only seems to happen when using monitor and an external speaker. Has anyone had this problem??? I have also heard 2 birdies on 20 meters anf 1 on 40 meters. I know I tightened all the screws during assembly for good grounds,but could have missed one???? Thanks , Wade w7ute


     
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[wayne burdick]

Hi Wade,

>> While using the monitor feature to listen to my audio, I had my head
>> phones on in transmit. The ext speaker doesn't cut out during
>> transmit.

Correct.  If SPKR+PH is ON then the speaker is active when the
headphones are active.

Tx or Rx is not a condition of making the speaker active.

>> This only seems to happen when using monitor and an external speaker.

Correct.

>> Has anyone had this problem???

I don't think this is a problem. It is how you have the radio set up.

>> I have also heard 2 birdies on 20 meters anf 1 on 40 meters. I know I
>> tightened all the screws during assembly for good grounds,but could
>> have missed one????

The K3 is a very high-dynamic range, down-conversion superhet. It's
nearly impossible to remove all birdies in such a design. But we think
we did a pretty good job of it :)

If you have any left (that you can hear with an antenna connected), you
can "remove" them using the SIG RMV menu entry in the CONFIG menu.
Below are the instructions for SIG RMV, from the latest owner's manual
(not released yet).

73,
Wayne
N6KR


* * *

SPURIOUS SIGNAL REMOVAL: Fast-tuning “birdies” can in some cases be
eliminated using the SIG RMV menu entry. We recommend that this be
attempted only on birdies that can be heard with an antenna connected.
(In SSB modes, simply leaving auto-notch on may be effective.)

STEPS:

(1) Set up the receiver for a desired band, and select the mode you’d
normally use in the target band segment. Also set the DSP passband
controls to the settings you use most often (e.g., NORMalized by
holding NORM).

(2) Locate a birdie to be removed. A birdie is considered “fast-tuning”
if a small change in the SHIFT control (e.g. 50 Hz) moves the birdie
about 400 Hz or more (with a narrow filter selected, this small shift
may move it completely out of the passband). Such birdies result from
UHF harmonics of the VFO. If you test a birdie using SHIFT, be sure to
return SHIFT to its normal setting before continuing, because the value
of SHIFT affects the birdie frequency.

(3) Change the SIG RMV parameter to 0. This will save necessary
information about the birdie, including the present VFO frequency,
mode, filter, and SHIFT value.

(4) Try different parameter values, starting with -1 or 1, to see if
the birdie can be removed (shifted out of the audible passband). Use
the smallest effective value.

Important: If you change the parameter, exit the menu and see if the
birdie has disappeared. Each SIG RMV value applies to a single 100-Hz
VFO segment, e.g. from 28135.30to 28135.39, so you’ll have to tune
slowly through that 100-Hz range using 10-Hz steps to make sure the
birdie has been completely removed. You may hear a slight tuning
artifact as you tune in and out of the mapped-out segment.

Note: In many cases, you’ll need to apply SIG RMV to at least two
adjacent 100-Hz VFO segments. Also, if you use more than one filter
bandwidth or SHIFT setting in the present operating mode, you’ll
probably need to map out the birdie more than one time. If you change
your CW sidetone pitch, you may need to re-do the procedure.

To undo SIG RMV:

If you tapCLR while you’re in the SIG RMV menu entry, all birdie
information for the present band will be permanently deleted.

Limitations:

SIG RMV applies only to CW/SSB/DATA modes, and only to the main
receiver (at present). Do not remove birdies on transverter bands;
instead, remove them on the I.F. band. On each band from 160-6 m, up to
60 birdies can be removed. But as mentioned above, each one may have to
be mapped out from adjacent VFO segments as well as for different
filter and SHIFT settings. So the number of birdies that can be
completely removed is around 5 to 20 per band.

* * *


---

http://www.elecraft.com

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