Topics

160m low sensitivity

hwolfla
 

For some reason, my K3 has low sensitivity on 160M.  The transmitter works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW

Dave Cole
 

Did you actually measure the sensitivity, if so, what was it? or is this a subjective observation?

Elecraft has a very cool calibrator which I use when I have subjective questions about my receiver sensitivity changing, I use it when I want to move my observations out of the subjective realm.

Your first step should be to triage the antenna out of the picture.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 12/12/19 11:10 AM, hwolfla wrote:
For some reason, my K3 has low sensitivity on 160M.  The transmitter works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW

Carl Clawson
 

The classic first answer to questions like this is "check to make sure you have the right antenna selected."
HTH
73, Carl WS7L


On Thu, Dec 12, 2019 at 11:10 AM hwolfla <hwolfla@...> wrote:
For some reason, my K3 has low sensitivity on 160M.  The transmitter works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW

David Mackey
 

Check to see if it is switching to a receive antenna that might not be connected.

Just an idea.

73 Dave K1KA

David Mackey 
Cell: 603 247 4834


On Dec 12, 2019, at 14:10, hwolfla <hwolfla@...> wrote:

For some reason, my K3 has low sensitivity on 160M.  The transmitter works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW

Mel Marcus
 

Dave

What is the calibrator that you use?

MEL
NE9A

-------- Original Message --------
Subject: Re: [Elecraft-K3] 160m low sensitivity
From: "Dave Cole" <dave@...>
Date: Thu, December 12, 2019 1:26 pm
To: Elecraft-K3@groups.io

Did you actually measure the sensitivity, if so, what was it? or is this
a subjective observation?

Elecraft has a very cool calibrator which I use when I have subjective
questions about my receiver sensitivity changing, I use it when I want
to move my observations out of the subjective realm.

Your first step should be to triage the antenna out of the picture.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 12/12/19 11:10 AM, hwolfla wrote:
> For some reason, my K3 has low sensitivity on 160M.  The transmitter
> works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW
>



Mel Marcus
 

Dave

What is the calibrator that you use?

Mel
NE9A

-------- Original Message --------
Subject: Re: [Elecraft-K3] 160m low sensitivity
From: "Dave Cole" <dave@...>
Date: Thu, December 12, 2019 1:26 pm
To: Elecraft-K3@groups.io

Did you actually measure the sensitivity, if so, what was it? or is this
a subjective observation?

Elecraft has a very cool calibrator which I use when I have subjective
questions about my receiver sensitivity changing, I use it when I want
to move my observations out of the subjective realm.

Your first step should be to triage the antenna out of the picture.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 12/12/19 11:10 AM, hwolfla wrote:
> For some reason, my K3 has low sensitivity on 160M.  The transmitter
> works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW
>



Dave Cole
 

Elecraft XG3... See:

https://elecraft.com/collections/test-equipment/products/xg3

I also use it for a low level signal source during group antenna builds for our club.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 12/12/19 2:18 PM, Mel Marcus wrote:
Dave
What is the calibrator that you use?
MEL
NE9A
-------- Original Message --------
Subject: Re: [Elecraft-K3] 160m low sensitivity
From: "Dave Cole" <dave@... <mailto:dave@...>>
Date: Thu, December 12, 2019 1:26 pm
To: Elecraft-K3@groups.io <mailto:Elecraft-K3@groups.io>
Did you actually measure the sensitivity, if so, what was it? or is
this
a subjective observation?
Elecraft has a very cool calibrator which I use when I have subjective
questions about my receiver sensitivity changing, I use it when I want
to move my observations out of the subjective realm.
Your first step should be to triage the antenna out of the picture.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 12/12/19 11:10 AM, hwolfla wrote:
> For some reason, my K3 has low sensitivity on 160M.  The transmitter works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW
>

Ken
 

What are you using for a receive antenna on 160m ?

I use an Inverted "L" for TX and a DXE Active Vertical Receive Antenna for RX.
I also have a Hi-Z Three Element Receive Array for RX only. Sometimes it is better, sometimes it isn't.

SSB and CW signals are often weak. FT8 signals are so strong that I usually use the K3 attenuator to reduce the signal strength so as not overload everything.

The more RX Antennas you have on 160m the better chance you have of copying the DX station. YMMV !

Ken - W8KEN

On 12/12/2019 2:10 PM, hwolfla wrote:
For some reason, my K3 has low sensitivity on 160M.  The transmitter works fine.  Does anyone have any suggestions?   Thanks,  K9LZJ & W9VW

JohnG3PQA
 

Is the lack of sensitivity on 160m only? If so possibly BPF or relay. Is it the RX input only ?
Assuming it is nothing simple you have overlooked, and applies to all bands, then the usual reason for lack of sensitivity is a faulty PIN diode used for TX/RX switching. (I had to replace D5 on the KXV3 and others in my K3)
John G3PQA