[Elecraft] K3 for Broadcast Band DX

[Hank P]

Along this subject of BPF3 - When I assembled my K3 with sub rx - I put the
BPF3 in the sub rx  - on the assumption that it might degrade the out of
band main rx protection with some filter  blow by  if I put it in the main
rx path. Now I wish I had put in in the main rx so I could use the P3  out
of the ham bands- especially below 160)

Was this a false worry ? (I live in a hot bed within 3 to 4 miles of several
contesters / dxers with HUGE signals at my place - two of whom can put 50 to
100 mv of signal here on 160 - easy to see both on a scope on antenna)

I am going to buy the new KXV3B and will have to take the sub rx out to
install and that would be a good time to move that filter if its not an
issue.

Hank K7HP



-----Original Message----- 
From: Joe Subich, W4TV
Sent: Monday, June 08, 2015 12:25 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 for Broadcast Band DX


> Therefore, at this juncture, the K3 is totally not up to the job when
> it comes to broadcast band DX hunting. What's up here?

As documented here literally dozens of times, the TR switch contains a
high-pass filter with a 1600 KHz cutoff to protect the PIN diodes and
keep them from generating interference due to strong broadcast band
signals.  If you want to receive the broadcast (and MW bands) with full
sensitivity, 1) install the BPF3 receive filter *and* 2) use a separate
receive antenna connected to either the RX ANT IN jack or the XVTR IN
jack.

73,

   ... Joe, W4TV


On 2015-06-08 3:04 PM, Carl Jón Denbow wrote:
> I sometimes like to do a little Broadcast Band DX, takes me back to my
> high schools days with my GE transistor radio under the pillow.  I think
> some of you know the story. ;-)  At any rate, I have the general
> coverage module installed in the main receiver, but I have found the
> sensitivity of it in the broadcast band to be horrible.  I can hook up
> my Palstar R40 and get a 40 over signal from a station, but with the K3
> hooked up to the same antenna that station is an S4  --  just barely
> over the noise level.  This is a station 100 miles way that I could
> receive on that old GE transistor radio at what would have at least been
> an S9 signal.  Therefore, at this juncture, the K3 is totally not up to
> the job when it comes to broadcast band DX hunting.  What's up here?
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