Jim,
with the pick-off point clearly *before* the noise gate, the NB can
not possibly provide any *blanking* to the P3. There may certainly
be artifacts due to changes in the impedance (loading) seen by the
P3, but that is a *big difference* from real banking.
Please study the schematics before you claim the hardware blanker
*works* for the P3.
73,
... Joe, W4TV
On 2014-08-18 2:54 AM, Jim Brown wrote:
Joe,
I don't want to be confrontational and I greatly value your engineering
mind, but I'm quite certain that the wide K3 NB DOES affect the P3
display. I work a lot of JT65 on 6M, and there are several strong
signals (not of overload magnitude) near me. The NB DOES create
artifacts that result in multiple decodes, and corresponding stuff that
is quite visible in the P3 display, and that is not visible when the K3
NB is off.
73, Jim K9YC
On Fri,8/15/2014 2:35 PM, Joe Subich, W4TV wrote:
I often study the screen of my P3, which DOES show reduction of noise
when the wider NB is active. 2-4 dB is typical for the types of noise
for which it is effective.
2 - 4 dB may be due to upsetting the impedance at the IF feed but given
the circuit topology it is not possible for the NB to provide effective
blanking to the P3 with the noise gate *after* the IF pick-off point.
73,
... Joe, W4TV
On 2014-08-15 5:13 PM, Jim Brown wrote:
On 8/15/2014 11:29 AM, Joe Subich, W4TV wrote:
Jim, that information is incorrect. The K3 NB can not possibly have
any impact on the P3 or P3SVGA as the IF pick-off is at the output
of the first mixer - *before* any noise blanker gate.
Joe,
I've never studied the schematic or signal flow in the regard, but I
often study the screen of my P3, which DOES show reduction of noise when
the wider NB is active. 2-4 dB is typical for the types of noise for
which it is effective.
I appreciate the alert to the existence of the P3 NB. I last updated
firmware about six months ago, and it was not in that version. It does,
indeed, work pretty well.
73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to li...@subich.com
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to j...@audiosystemsgroup.com
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to li...@subich.com
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
