KX3 Receiver Overload Protection?

[Elecraft mailing list]

Does the KX3 have any form of Reciever Overload protection like the K3 does?

If so it would be nice to leave it setup as a secondary radio to my K3 (hooked to a second antenna)
Thank you







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[GM4JJJ]

Harry,

Yes it appears to have

from Page 43 of the owners manual:



HI RFI warning, preamp turns off, or RX icon turns on: The KX3 protects itself from high received signal levels. First, the preamp is turned off, if it was on. (You may be able to avoid this by using the 10-dB preamp rather than the 20-dB preamp on the current band. See MENU:PREAMP.) The second step taken by the KX3, if necessary, is to turn on a 15-dB attenuator stage in the I.F. section, ahead of the receiver’s A- to-D converter. The receive overload icon (RX), near the ANT icon, will turn on. Once signals return to a safe level for 5 seconds, this attenuator will be turned back off. Also see COR (next item).

§  Carrier-operated relay activated (a relay is heard, and the RX icon turns on): The carrier-operated- relay (COR) may be activated due to the signal from a nearby transmitter. This is usually due to close proximity between your antenna and the other station’s antenna. The COR is actually the relay for the present low-pass filter. When the relay opens, signals will drop by 40 to 60 dB, protecting the KX3. The relay will close again shortly after the signal drops. If the COR is being repeatedly activated, try moving the antennas farther apart. You can also increase the COR threshold, at your discretion; see MENU:COR LVL.



73

David Anderson GM4JJJ

> On 5 Jun 2015, at 03:16, Harry Yingst via Elecraft <[hidden email]> wrote:
>
> Does the KX3 have any form of Reciever Overload protection like the K3 does?
>
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[Elecraft mailing list]

Thanks to all who responded
Looks like I'm good to go







     
   

   
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[G8BYB]

Harry,

Be aware that the preamp does not come back on. I encounter this problem periodically when contesting in the UK (6m UKAC) as I have 2 very strong stations nearby and while tuning through the band if I happen to be on frequency when one of them transmits AND our antennas are pointing roughly at each other the KX3 does the full close down as David describes.
On odd occasions I can be working someone near the noise level and one of the locals fires up close to my frequency, this shuts everything down and by the time I've recovered the DX station can have gone. I am looking into using an external 6m preamp but I will probably experience the same issue.

Best of luck.
Andrew
G8BYB

-----Original Message-----
From: Elecraft [mailto:] On Behalf Of David Anderson
Sent: 05 June 2015 08:15
To: Elecraft Reflector
Subject: Re: [Elecraft] KX3 Receiver Overload Protection?


Harry,

Yes it appears to have

from Page 43 of the owners manual:



HI RFI warning, preamp turns off, or RX icon turns on: The KX3 protects itself from high received signal levels. First, the preamp is turned off, if it was on. (You may be able to avoid this by using the 10-dB preamp rather than the 20-dB preamp on the current band. See MENU:PREAMP.) The second step taken by the KX3, if necessary, is to turn on a 15-dB attenuator stage in the I.F. section, ahead of the receiver s A- to-D converter. The receive overload icon (RX), near the ANT icon, will turn on. Once signals return to a safe level for 5 seconds, this attenuator will be turned back off. Also see COR (next item).

 ?  Carrier-operated relay activated (a relay is heard, and the RX icon turns on): The carrier-operated- relay (COR) may be activated due to the signal from a nearby transmitter. This is usually due to close proximity between your antenna and the other station s antenna. The COR is actually the relay for the present low-pass filter. When the relay opens, signals will drop by 40 to 60 dB, protecting the KX3. The relay will close again shortly after the signal drops. If the COR is being repeatedly activated, try moving the antennas farther apart. You can also increase the COR threshold, at your discretion; see MENU:COR LVL.



73

David Anderson GM4JJJ

> On 5 Jun 2015, at 03:16, Harry Yingst via Elecraft <[hidden email]> wrote:
>
> Does the KX3 have any form of Reciever Overload protection like the K3 does?
>
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[GM4JJJ]

Thanks for the heads up, I will watch for that on 144MHz here. Without a mast head preamp I need the internal preamp on the 14 MHz IF with my KX3 plus transverter. I suspect once I put the mast head preamp up that for best dynamic range and still good overall NF I won't need the preamp in the KX3. I'm pretty sure I modelled that a while ago anyway.

73

David Anderson GM4JJJ

> On 5 Jun 2015, at 16:25, Andrew Hebden <[hidden email]> wrote:
>
> Harry,
>
> Be aware that the preamp does not come back on. I encounter this problem periodically when contesting in the UK (6m UKAC) as I have 2 very strong stations nearby and while tuning through the band if I happen to be on frequency when one of them transmits AND our antennas are pointing roughly at each other the KX3 does the full close down as David describes.
> On odd occasions I can be working someone near the noise level and one of the locals fires up close to my frequency, this shuts everything down and by the time I've recovered the DX station can have gone. I am looking into using an external 6m preamp but I will probably experience the same issue.
>
> Best of luck.
> Andrew
> G8BYB
>
> -----Original Message-----
> From: Elecraft [mailto:] On Behalf Of David Anderson
> Sent: 05 June 2015 08:15
> To: Elecraft Reflector
> Subject: Re: [Elecraft] KX3 Receiver Overload Protection?
>
>
> Harry,
>
> Yes it appears to have
>
> from Page 43 of the owners manual:
>
>
>
> HI RFI warning, preamp turns off, or RX icon turns on: The KX3 protects itself from high received signal levels. First, the preamp is turned off, if it was on. (You may be able to avoid this by using the 10-dB preamp rather than the 20-dB preamp on the current band. See MENU:PREAMP.) The second step taken by the KX3, if necessary, is to turn on a 15-dB attenuator stage in the I.F. section, ahead of the receiver s A- to-D converter. The receive overload icon (RX), near the ANT icon, will turn on. Once signals return to a safe level for 5 seconds, this attenuator will be turned back off. Also see COR (next item).
>
> ?  Carrier-operated relay activated (a relay is heard, and the RX icon turns on): The carrier-operated- relay (COR) may be activated due to the signal from a nearby transmitter. This is usually due to close proximity between your antenna and the other station s antenna. The COR is actually the relay for the present low-pass filter. When the relay opens, signals will drop by 40 to 60 dB, protecting the KX3. The relay will close again shortly after the signal drops. If the COR is being repeatedly activated, try moving the antennas farther apart. You can also increase the COR threshold, at your discretion; see MENU:COR LVL.
>
>
>
> 73
>
> David Anderson GM4JJJ
>
>> On 5 Jun 2015, at 03:16, Harry Yingst via Elecraft <[hidden email]> wrote:
>>
>> Does the KX3 have any form of Reciever Overload protection like the K3 does?
> ______________________________________________________________
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>
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>
> ______________________________________________________________
> Elecraft mailing list
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>
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> Message delivered to [hidden email]

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