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

[Michael Blake]

Correction - "1.8MHz HPF"

73 - Mike - K9JRI
 

> On Mar 14, 2019, at 10:12 AM, Michael Blake via Elecraft <elecraft at mailman.qth.net> 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 <elecraft at mailman.qth.net>
>> 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 <elecraft at mailman.qth.net>
>> Reply-To: Michael Blake <k9jri at mac.com>
>> 
>> 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
>> k9jri at mac.com <mailto:k9jri at icloud.com>
>> 
>> 
>> 
>> 
>> 
>> 
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