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Where is the 1500 KHz. HPF in the K3/K3s

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Where is the 1500 KHz. HPF in the K3/K3s

I understand that a BCB HPF is necessary to protect the PIN diode switches from BCB (Broadcast Band) overload but I can not find it in the K3s schematics. Can anyone tell me which sheet and components make up this filter.

I understand that to receive 630M you bypass the HP filter by using the RX IN but I am curious where it is on the schematic.

Michael Blake
[hidden email] <mailto:[hidden email]>

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Fwd: Where is the 1500 KHz. HPF in the K3/K3s

Can anyone provide me with the location of the 160M HPF on the K3s schematic? On the KX3 schematic it is clearly labeled “1.8 KHz. HPF” but I have been unable to find the similar circuit on the K3s schematic.

Since you must use the RX IN connector to receive on 630M it is obviously in the circuit but I cannot find it on the drawings.

Any help?

73 - Mike - K9JRI

> Begin forwarded message:
>
> From: Michael Blake via Elecraft <[hidden email]>
> Subject: [Elecraft] Where is the 1500 KHz. HPF in the K3/K3s
> Date: March 10, 2019 at 9:38:49 AM EDT
> To: Elecraft Mailing List <[hidden email]>
> Reply-To: Michael Blake <[hidden email]>
>
> I understand that a BCB HPF is necessary to protect the PIN diode switches from BCB (Broadcast Band) overload but I can not find it in the K3s schematics. Can anyone tell me which sheet and components make up this filter.
>
> I understand that to receive 630M you bypass the HP filter by using the RX IN but I am curious where it is on the schematic.
>
> Michael Blake
> [hidden email] <mailto:[hidden email]>
>
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

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Re: Fwd: Where is the 1500 KHz. HPF in the K3/K3s

Correction - "1.8MHz HPF"

73 - Mike - K9JRI

> On Mar 14, 2019, at 10:12 AM, Michael Blake via Elecraft <[hidden email]> wrote:
>
>
> Can anyone provide me with the location of the 160M HPF on the K3s schematic? On the KX3 schematic it is clearly labeled “1.8 KHz. HPF” but I have been unable to find the similar circuit on the K3s schematic.
>
> Since you must use the RX IN connector to receive on 630M it is obviously in the circuit but I cannot find it on the drawings.
>
> Any help?
>
> 73 - Mike - K9JRI
>
>
>
>
>
>> Begin forwarded message:
>>
>> From: Michael Blake via Elecraft <[hidden email]>
>> Subject: [Elecraft] Where is the 1500 KHz. HPF in the K3/K3s
>> Date: March 10, 2019 at 9:38:49 AM EDT
>> To: Elecraft Mailing List <[hidden email]>
>> Reply-To: Michael Blake <[hidden email]>
>>
>> I understand that a BCB HPF is necessary to protect the PIN diode switches from BCB (Broadcast Band) overload but I can not find it in the K3s schematics. Can anyone tell me which sheet and components make up this filter.
>>
>> I understand that to receive 630M you bypass the HP filter by using the RX IN but I am curious where it is on the schematic.
>>
>> Michael Blake
>> [hidden email] <mailto:[hidden email]>
>>
>>
>>
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html