If you want to switch in real time (say on alternate sweeps, so the
P3 can display both main and sub at the same time) then you'd need
to use solid-state switches. Probably several sections to get the
required isolation.
I don't know that the requirement is for alternate sweep display
Hi Guy,
It's that way i was thinking to use the P3!
-1- ALWAYS on the sub-receiver output.
-2- ALWAYS on a separated antenna.
My idea was to externally switch the 6m
(or internally if possible?) antenna from
K3 sub-rcvr to main RF when some activity
was detected on th P3. When working
on 6m, no
Yeah,
The rub is getting Wayne to add an option that will look at the subRX
for the P3 interface functions. Think you might get what you're
asking for.
Others are asking for that to be switchable back and forth between the
two *dynamically*. This involves both IF's and allows for signals in
Others are asking for that to be switchable back and forth
between the
two *dynamically*. This involves both IF's and allows for
signals in
the IF of one RX to be heard in the other. This would a
switch with
100 dB isolation. It would be an expensive option, plus
some
significant new code.
I don't doubt for an instant what you say.
I'm thinking the common ground path issues and cable routing issues
would get it, not that you couldn't do it with the relays
standalone. And then the complaints would start about hearing
signals move in one RX while tuning on the other, starting with
Hi Guy,
All OK !
Effectively, i don't envisage to look for 50MHz activity
on the P3 during transmitting on lower bands.
I will look at the K3 schematics how are switched
antennas, KAT3, KRX3, etc.
I'm not 100% ok with all these connections for the moment...
and how TX/RX switching is done...
The K3's S-meter reads up to S9 + 60 dB, which is -13 dBm. The noise
floor in 500 Hz bandwidth with preamp on is around -136 dBm. So an IF
switch really needs more than 120 dB isolation to avoid cross-talk
between the main and sub-receivers.
That is certainly possible but it's not trivial
Hi Alan,
If modifications are not too heavy, it's
not a problem; but i don't like to take the risk
of performances degradation of the initial configuration.
That's the reason the 1st time i've opened
my K3 was for recent 8poles filter installation
and removing of original 2k7 5poles.
No risk
- Original Message - From: Alan Bloom a...@elecraft.com
To: hb9ari hb9...@bluewin.ch
Cc: Elecraft-forum Elecraft@mailman.qth.net
Sent: Tuesday, May 25, 2010 9:48 PM
Subject: Re: [Elecraft] K3 Sub-receiver use
Hi Rudolf,
At the bottom of this message I will copy a posting from W3SZ on the
LP
Hi Alan,
No more a dream for me !
If i dare, you can put me on the list!
73 QRO,
Rudolf, HB9ARI
PS Excuse me for my bad mood !
I love too much MY K3...
Alan Bloom wrote:
Yes, the P3 assumes it is connected to the main receiver's IF output, so
if it is actually connected to the sub-RX it
Guy Olinger wrote:
That aside, I believe someone using the sub-RX with the TX in split,
while leaving the main RX to feed the P3, would accomplish the same
end.
Afraid not, Guy. Cross-band split is not supported, so the envisaged
mode of operation (main RX on 6m feeding the P3, subRX and TX
G'day,
-3dB if the sub-RX is enabled.
Regards,
Mike VP8NO
- Original Message -
From: Guy Olinger K2AV olin...@bellsouth.net
To: a...@elecraft.com
Cc: Elecraft-forum Elecraft@mailman.qth.net
Sent: Tuesday, May 25, 2010 11:50 PM
Subject: Re: [Elecraft] K3 Sub-receiver use
That aside
On Tue, 2010-05-25 at 22:36 -0700, Brett Howard wrote:
Can the P3 at least show where the sub RX is and its BW and what not if
its on the same screen full of where the Main RX is?
Yes, that's the way it works normally. Even though P3 is receiving the
main receiver's IF output, there is a
On Tue, 25 May 2010 21:25:15 -0700, Alan Bloom a...@elecraft.com
wrote:
Ouch!
Does this mean that the P3 will not display the frequency of or the
signals seen by the KRX3?
If that is true, it is a show stopper for me.
TOM, N5GE BT 73 ES GUD LUK
AR DE N5GE SK
http://www.n5ge.com
Yes, the P3
The P3 is connected to the main receiver's IF output, so it is showing
the signals being received by the main RX. However there is a cursor on
the screen that shows the frequency and bandwidth of the sub-RX, as long
as its frequency is within range of the currently-displayed span.
That's exactly
The trick involved in that switch is a very high isolation between the
two IF's (RXA and RXB) currently very nicely highly isolated. If that
is degraded, then one starts hearing in one receiver the contents of
the other. Not at all a trivial modification, as high isolation
switches are not cheap.
, even if one has the find a fellow
ham to help with the actual conversion.
(But then I do lots of home construction)
73, Ed - KL7UW
--
Message: 18
Date: Tue, 25 May 2010 18:48:20 -0700
From: Alan Bloom a...@elecraft.com
Subject: Re: [Elecraft] K3 Sub-receiver use
Hello,
Before to order a sub-receiver for my K3 (#1212),
i would know if the primary use i've envisaged is possible:
RX/TX on main receiver on 20m for example, with
output power between 5 and 75W (JT65A mainly).
Sometimes, the auto-tuner in the K3 is used.
RX on sub-receiver for 6m on a
-- need your country on that
mode/band.
--
From: hb9ari hb9...@bluewin.ch
Sent: Tuesday, May 25, 2010 3:52 AM
To: Elecraft-forum Elecraft@mailman.qth.net
Subject: [Elecraft] K3 Sub-receiver use
Hello,
Before to order a sub-receiver for my K3 (#1212
-- Will be looking for you on 14076 JT65A -- need your country on that
mode/band.
--
From: hb9arihb9...@bluewin.ch
Sent: Tuesday, May 25, 2010 3:52 AM
To: Elecraft-forumElecraft@mailman.qth.net
Subject: [Elecraft] K3 Sub-receiver use
Hello,
Before
: Tuesday, May 25, 2010 3:52 AM
To: Elecraft-forum Elecraft@mailman.qth.net
Subject: [Elecraft] K3 Sub-receiver use
Hello,
Before to order a sub-receiver for my K3 (#1212),
i would know if the primary use i've envisaged is possible:
RX/TX on main receiver on 20m for example, with
output power
.
--
From: hb9arihb9...@bluewin.ch
Sent: Tuesday, May 25, 2010 3:52 AM
To: Elecraft-forumElecraft@mailman.qth.net
Subject: [Elecraft] K3 Sub-receiver use
Hello,
Before to order a sub-receiver for my K3 (#1212),
i would know if the primary use i've envisaged
If the P3 gets its signal from the IF out connector on the KXV3 (or
KXV3A), then it will not work with the subRX; the IF out connection from
the KXV3 is from the main receiver only. I seem to recall reading posts
from someone who had done some surgery on his KRX3 in order to create a
similar
If the P3 gets its signal from the IF out connector on the KXV3 (or
KXV3A), then it will not work with the subRX; the IF out connection from
the KXV3 is from the main receiver only.
Correct.
If you decide to bring out an IF signal from the KRX3, keep in mind that
there is 100 dB to 120
Elecraft@mailman.qth.net
Sent: Tuesday, May 25, 2010 5:52 AM
Subject: [Elecraft] K3 Sub-receiver use
Hello,
Before to order a sub-receiver for my K3 (#1212),
i would know if the primary use i've envisaged is possible:
RX/TX on main receiver on 20m for example, with
output power between 5
Hi Rich,
Very bad news !
That was my 1st idea when ordering the P3
to use it for wide span use for phone mode.
(50Mhz in priority during possible apertures)
For digi mode, as JT65, the ~2kHz width
of waterfall is 100% sufficient, because
frequencies are well defined (for ex 14.076Mhz)
I'm quite
Hi Rudolf,
At the bottom of this message I will copy a posting from W3SZ on the
LP-PAN email list that describes how he added IF output to his K3
sub-receiver. He used the Z1 buffer amp from Clifton Labs:
http://www.cliftonlaboratories.com/z1_buffer_amp.htm
If you don't mind modifying
Wouldn't there be a K3 interoperating with P3 firmware issue with
running the P3 on the sub-RX? Just because you could feed a
**stand-alone** box with a non-company mod for sub-RX IF, does not
mean the P3 would change the sub-RX with a click on the P3. There is a
lot of proprietary communication
Yes, the P3 assumes it is connected to the main receiver's IF output, so
if it is actually connected to the sub-RX it would still work but would
not display the correct frequencies and levels. If this becomes popular
enough maybe we should think about adding sub-RX support to P3 firmware.
Alan
Hi Steve,
A lot of money hi !
As the P3's IF should be software
defined, i could use it with an other
rig, where an IF output is installed or
a modification easily feasible.
I've connected the PR6 on my K3,
and RX have done some comparisons
with my old FT857 WITHOUT preamp
sharing the same
Hi Mike,
Same answer as for Steve,
as IF input of P3 should be
software defined, i could
use it with a dedicated 6m rig.
73 QRO,
Rudolf, HB9ARI
K2MK wrote:
Hi Rudolf:
You should be able to stop the P3. They are not starting shipments of
the P3 until 15 July.
73,
Mike K2MK
Can the P3 at least show where the sub RX is and its BW and what not if
its on the same screen full of where the Main RX is?
~Brett
On Tue, 2010-05-25 at 21:25 -0700, Alan Bloom wrote:
Yes, the P3 assumes it is connected to the main receiver's IF output, so
if it is actually connected to the
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