[Elecraft] KX2 Receive problem!?

[Chuck Guenther]

Wayne,

Thanks for posting this!  Since the KX2 is my first SDR, it never 
occurred to me to try the preamp on 80 meters.  In fact I was very happy 
running with the preamp off, attenuator off, and RF gain set between 
about -3dB and -6dB.  This morning I was listening to FK8DD, and found I 
could copy him much better with preamp on, and RF gain at -10 dB, 
attenuator still off..


BTW, I really like the AGC on the KX2, and often find myself trying to 
adjust my K3 so it sounds as good as the KX2.


73,

Chuck Guenther  NI0C



Quote from N6KR:

"First thing to check is to make sure the preamp is on, and the attenuator 
turned off. Both are selected using the PRE switch. The KX2 is an SDR, and typically 
such rigs have about -120 dBm MDS with preamp off, and -135 dBm with preamp on. This 
can make a huge difference on a quiet band.

The dynamic range is good enough that you can probably leave the preamp on all 
or most of the time.

Let me know if your received signals are still down after turning on the 
preamp. If that doesn't fix it, you could have APF turned on (very narrow audio 
peaking filter), or NR turned on (noise reduction), or you could have a problem 
with a bandpass filter, etc.

73,
Wayne
N6KR"





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Re: [Elecraft] KX2 Receive problem!?

[Wayne Burdick]

Paul,

First thing to check is to make sure the preamp is on, and the attenuator 
turned off. Both are selected using the PRE switch. The KX2 is an SDR, and 
typically such rigs have about -120 dBm MDS with preamp off, and -135 dBm with 
preamp on. This can make a huge difference on a quiet band. 

The dynamic range is good enough that you can probably leave the preamp on all 
or most of the time. 

Let me know if your received signals are still down after turning on the 
preamp. If that doesn't fix it, you could have APF turned on (very narrow audio 
peaking filter), or NR turned on (noise reduction), or you could have a problem 
with a bandpass filter, etc.

73,
Wayne
N6KR


On Jan 18, 2017, at 8:32 AM, Paul Smith  wrote:

> I have a KX2 nr 855 I bought in August.This is my first venture in in a 
> sophisticated radio. I have been operating kit built rigs for years. My KX2 
> has the latest firmware  MCU revision 02.69.
> 
> The receive seems to be down quite a bit. My antennas are a 102 ft doublet at 
> 50 ft and a Zepp at 50 feet. Each fed with 450 ladder line. On the 4SQRP nets 
> I have been frequently been told they can hear me and I hear NO ONE.
> 
> The question is could someone share the setup information with me for filters 
> and such. My ears do not require much filtering as my old ELMER used to YELL 
> at me use the filter between ur ears. I have made some contacts but I would 
> like to hear more.
> 
> Thanking in advance de Paul N0NBD
> 
> 
> Sent from Outlook
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[Elecraft] KX2 Receive problem!?

[Paul Smith]

I have a KX2 nr 855 I bought in August.This is my first venture in in a 
sophisticated radio. I have been operating kit built rigs for years. My KX2 has 
the latest firmware  MCU revision 02.69.

The receive seems to be down quite a bit. My antennas are a 102 ft doublet at 
50 ft and a Zepp at 50 feet. Each fed with 450 ladder line. On the 4SQRP nets I 
have been frequently been told they can hear me and I hear NO ONE.

The question is could someone share the setup information with me for filters 
and such. My ears do not require much filtering as my old ELMER used to YELL at 
me use the filter between ur ears. I have made some contacts but I would like 
to hear more.

Thanking in advance de Paul N0NBD


Sent from Outlook
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