[Elecraft] Just curious about K3 relay switching clicks

[Ramiro Aceves]

Gary Hvizdak escribió:
> Hi Ramiro,
> 
>  
> 
>     Below I’ve pasted portions of the K3 Owner’s manual (theory of 
> operation section) and portions of the K3 Service manual (i.e. the 
> schematics).
> 

Thanks Gary for the information. I understand it better now. I would 
like to know if the exact frequencies of filter change are documented 
somewhere.
Is there a K3 Service Manual around there?

Thank you very much.

Ramiro, EA4NZ

>  
> 
>     In summary, the “base” K3 has a separate BPF for each ham band, 
> although they share many components as follows:
> 
> ·         80/160m
> 
> ·         40/60m
> 
> ·         20/30m
> 
> ·         15/17m
> 
> ·         10/12m
> 
> ·         6m
> 
>  
> 
>     In contrast, there are only seven LPFs which are allocated/shared as 
> follows:
> 
> ·         160m
> 
> ·         80m
> 
> ·         40/60m
> 
> ·         20/30m
> 
> ·         15/17m
> 
> ·         10/12m
> 
> ·         6m
> 
>  
> 
>     The general coverage option includes eight additional BPFs.  As with 
> the K3’s built-in LPFs, these BPFs also share many components as follows:
> 
> ·         500 kHz .. 2 MHz / 2 .. 3.5 MHz
> 
> ·         4 .. 7 MHz / 7 .. 10 MHz
> 
> ·         10 .. 14 MHz / 14 .. 18 MHz
> 
> ·         18 .. 23 MHz / 23 .. 28 MHz
> 
>  
> 
>     I may not have answered your question, but I learned something in 
> the process of attempting to.  Hopefully you will get some benefit from 
> my analysis as well?
> 
>  
> 
> 73,
> 
> Gary  KI4GGX
> 
> K3 #2724
> 
>  
> 
> ------------------------------------------------------------------------
> 
>  
> 
> */Band-Pass Filters (BPFs)/*
> 
> */ /*
> 
> At back-left is the bank of ham-band BPFs.  These filters are just wide 
> enough to cover each ham band, so they
> 
> provide good rejection of IMD products during both transmit and receive. 
> Hi-Q components, including large
> 
> toroids, ensure low loss and high signal-handling capability.  General 
> coverage receive capability can be added
> 
> to the K3 with the KBPF3 option, which includes another 8 band-pass 
> filters that cover all of the areas from 0.5
> 
> to 28 MHz that are not covered by the filters on the RF board.  The 
> KBPF3 module mounts directly above the
> 
> main BPF array, and due to its very short connections, has no effect on 
> the performance of the main BPFs
> 
> during ham-band operation.
> 
>  
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> *Ramiro Aceves*   
> <mailto:elecraft%40mailman.qth.net?Subject=Re:%20%5BElecraft%5D%20Just%20curious%20about%20K3%20relay%20switching%20clics&In-Reply-To=%3C4BF4F59F.1010001%40gmail.com%3E>
> /Thu May 20 04:41:03 EDT 2010/
> 
>  
> 
> Hi all,
> 
>  
> 
> Doing some SW listening today, I notice that there is a relay click at 
> 
> 17700 KHz and another close one at 17685 KHz. Just curious about it.  Is 
> 
> there a place where that switching frequencies are documented? I mean, 
> 
> band pass ham filters, BPF3 filters and low pass filters.
> 
>  
> 
> Thanks
> 
> Ramiro. EA4NZ, ex EA1ABZ
> 
>  
>