K3 KBPF3 Benefits without SubReceiver?

[k4tmc]

I am thinking about what future options to order for my K3.  I do not
plan to get the KRX3 Subreceiver.  So, what benefit would it be to get
the KBPF3 General Coverage RX Filter Module?  Since this mounts on the
RF board over the ham band bandpass filters, will this impact the
performance while in the ham bands?

73,
Henry - K4TMC
K3 #98
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[Ed Muns, W0YK]

> I am thinking about what future options to order for my K3.  
> I do not plan to get the KRX3 Subreceiver.  So, what benefit
> would it be to get the KBPF3 General Coverage RX Filter
> Module?  Since this mounts on the RF board over the ham band
> bandpass filters, will this impact the performance while in
> the ham bands?


A KBPF3 can be mounted on either or both the main receiver and KRX3.  It
functions the same in each receiver and adds the band pass filters to cover
the frequencies outside the Ham bands.  The benefit is allowing reception
outside the Ham bands.  There is no performance impact in the Ham bands with
the KBPF3 installed.  It is out of the circuit and not used inside the Ham
bands.

73,
Ed - W0YK

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[KK7P]

> ... what benefit would it be to get
> the KBPF3 General Coverage RX Filter Module?  ...  will this impact the
> performance while in the ham bands?

The KBPF3 is switched into the signal path instead of the ham-band
bandpass filters when you tune the K3 outside the ham bands.  When you
are tuned inside the ham bands, it is bypassed and the standard ham-band
filters are used.

There is no practical degradation of ham-band performance, and greatly
enhanced reception when outside the ham bands.

I use mine regularly!

Merry Christmas,

Lyle kK7P

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[k4tmc]

Kyle, et al,

Thanks for the quick responses.  OK, it looks like the KBPF3 turns the
K3 into a general coverage receiver without having to order the
SubReceiver option.  That sounds like a reasonable option to have to
allow listening to the CB/FRS bands :-)

My concern about the mounting location is the affect of the KBPF3
circuit board with similar tuned circuits in such close proximity to
the ham band tuned circuits.  The affect may be subtle and only
detectable in unusually strong signal situations.  I just do not want
to add something that could slightly reduce the K3's performance in the
ham bands.  Instead, I can buy a good used separate 0.5 - 30 MHz
receiver for SWBC coverage for the same price as the KBPF3.

73,
Henry - K4TMC


-----Original Message-----
From: Lyle Johnson <[hidden email]>
To: [hidden email]
Cc: [hidden email]
Sent: Sat, 22 Dec 2007 10:17 pm
Subject: Re: [Elecraft] K3 KBPF3 Benefits without SubReceiver?

> ... what benefit would it be to get
> the KBPF3 General Coverage RX Filter Module?  ...  will this impact
the

> performance while in the ham bands?


The KBPF3 is switched into the signal path instead of the ham-band
bandpass filters when you tune the K3 outside the ham bands.  When you
are tuned inside the ham bands, it is bypassed and the standard
ham-band
filters are used.


There is no practical degradation of ham-band performance, and greatly
enhanced reception when outside the ham bands.


I use mine regularly!


Merry Christmas,


Lyle kK7P







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[Benny Aumala]

k4tmc wrote:
"Instead, I can buy a good used separate 0.5 - 30 MHz receiver for SWBC
coverage for the same price as the KBPF3."

Instead, you can take an SDR-IQ and use it as HF-RX. When not after BC,
it can serve as a band scope for K3.

Benny OH9NB


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[AC7AC]

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