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

[Michael Blake]

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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