Brett,
Those numbers are similar to what I measured on my K3. It varies by
band, but before modification I was getting in the neighborhood of -6 dB
with preamp on and -17 dB with preamp off. After modification I
measured +4.5 dB with preamp on and -6.5 dB with preamp off (at 10 MHz).
A 0603 res
Ok so I decided to do the IF mod as the P3 will be ordered when it comes
out and I'd like the increased sensitivity. I'm copying elecraft and K3
support cause I wanted to ask a simple question (as well as share the
results). First my question, I didn't have any 13K ohm resistors in
0805 size. So
Thanks to all, this list is great.
Am 13.01.2010 15:28, schrieb Lyle Johnson:
>
>> I hook my TS-850 to the IF-output,...
>> I set the TS-850 to USB when listening to LSB-sigs on 80m.
>> Why is this the case?
>>
>
> The K3 uses high-side injection on all bands except 6 meters.
>
> 73,
>
> Ly
Martin,
If the frequency of the LO signal applied to a mixer is higher than that of
the incoming signal frequency, as is the case in the K3's receiver on all
bands except 6m, then a received LSB signal will appear as a USB signal at
the mixer's IF output. Also a received USB signal, for exampl
> I hook my TS-850 to the IF-output,...
> I set the TS-850 to USB when listening to LSB-sigs on 80m.
> Why is this the case?
>
The K3 uses high-side injection on all bands except 6 meters.
73,
Lyle KK7P
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I hook my TS-850 to the IF-output, it works fine.
Make sure your "panorama-radio" is not able to transmit into your K3,
e.g. use a RX-only input or modify it.
I set the TS-850 to USB when listening to LSB-sigs on 80m.
Why is this the case?
Have not yet verified if that changes when listening to
-boun...@mailman.qth.net] On Behalf Of sr...@swbell.net
Sent: Tuesday, January 12, 2010 4:34 PM
To: d...@w3fpr.com
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] IF output
I was expecting to hear a carrier, but after I thought about it that
can't be the case.
With the IF connec
- Original Message -
From: "Alan Bloom"
To:
Cc:
Sent: Tuesday, January 12, 2010 1:55 PM
Subject: Re: [Elecraft] [K3] IF output
> You should hear whatever signals the K3 is tuned to. I'm assuming you
> are connected to the IF OUT jack of the KXV3 or KXV3A.
>
>
ail.com]
Sent: Tuesday, January 12, 2010 4:27 PM
To: sr...@swbell.net
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] IF output
Stan,
I should think you can - although you will have to be careful to listen
to the correct audio channel - it would be wierd to hear the real K3
received signal
Stan,
I should think you can - although you will have to be careful to listen
to the correct audio channel - it would be wierd to hear the real K3
received signal in one ear and the sub receiving the IF output signal in
the other.
73,
Don W3FPR
sr...@swbell.net wrote:
> Don, can I use the SUB
Burl,
Some will do that, but most will not - it all depends on the exact value
of the capacitors in the VFO Range Select circuit - a few pF one way or
another makes a big difference. BTW, that is what setting the L30
adjustment to get the voltage at the left end of R30 is all about.
Yes, the
@mailman.qth.net
Subject: Re: [Elecraft] [K3] IF output
If you have an oscilloscope you can connect it and see the output. I have a
K3 which has the modified IF with higher output. I have a 5 MHz (-3 dB)
oscilloscope in my shack for monitoring. Even at 8.215 MHz it indicates up
to +/- 50 mV in the 40 m
Don, can I use the SUB receiver in the K3 to do that? I have the KBPF3 in the
sub receiver.
Stan Rife
W5EWA
- Original Message -
From: Don Wilhelm
To: sr...@swbell.net
Cc: elecraft@mailman.qth.net
Sent: Tue, 12 Jan 2010 16:06:55 -0600 (CST)
Subject: Re: [Elecraft] [K3] IF output
If you have an oscilloscope you can connect it and see the output. I have a
K3 which has the modified IF with higher output. I have a 5 MHz (-3 dB)
oscilloscope in my shack for monitoring. Even at 8.215 MHz it indicates up
to +/- 50 mV in the 40 m band (no ATT, no PRE). In other bands it is lower,
: [Elecraft] [K3] IF output
Stan,
The K2 cannot receive that frequency - the dial may say so, but the
VFO/PLL has maxed out at about 7400 kHz (if you are tuning from 40
meters) and although the dial continues to increment, the actual
frequency will not go any higher. Even if it did, the
I thought about that and I guess that must be the case.
Stan Rife
W5EWA
-Original Message-
From: Joe Planisky [mailto:jp...@jeffnet.org]
Sent: Tuesday, January 12, 2010 3:57 PM
To: sr...@swbell.net
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] IF output
I don&#
Stan,
The K2 cannot receive that frequency - the dial may say so, but the
VFO/PLL has maxed out at about 7400 kHz (if you are tuning from 40
meters) and although the dial continues to increment, the actual
frequency will not go any higher. Even if it did, the bandpass filters
would probably a
I don't think you'll hear much of anything on a K2 at 8.215 MHz.
That's well outside the 40m passband. The K2 does not have general
coverage RX.
73
--
Joe KB8AP
On Jan 12, 2010, at 1:05 PM, wrote:
> I am trying to verify the output at the IF OUT jack on the back of
> the K3. I have i
You should hear whatever signals the K3 is tuned to. I'm assuming you
are connected to the IF OUT jack of the KXV3 or KXV3A.
If you haven't done the IF output mod:
http://www.elecraft.com/K3/mods/IF_Output_Buffer_Gain_Mod_Rev_A.pdf
then the signal level will be lower than at the K3 antenna connec
I am trying to verify the output at the IF OUT jack on the back of
the K3. I have it connected to my K2 with the VFO set for 8215.00 and I see
or hear no signal at all. Shouldn't I see the output from the K3? Is the
signal that low that I won't even get a blip on the K2 receiver? Am I
missi
On 1/11/10 3:58 PM, K3RWN wrote:
> I take it this mod will increase the audio level?
No, it will only increase the level of the 8 MHz signal used for a
panoramic adapter (or other accessory) that appears at the IF output
connector. It won't affect the audio. You only need to do this if a) you
h
I take it this mod will increase the audio level?
Please excuse my ignorance on the subject.
Rich #3300
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Post: m
Thanks for the Chipquick suggestion; will get some of that post-haste.
As for the resistor, I took a look at it again. Doesn't look as bad as I
thought, and after testing it again with my vom, the reading is actually
13.04k, not 13.4 as I had originally written. That's less than .05%
variance in
Hi Dave,
I'll see what I can do to borrow another receiver. Otherwise, your Softrock
suggestion seems perfect.
As for the chipped resistor; I seem to have taken a very small bit off the
surface at one corner. It's the black material with the value etched on top
of it. I guess the edge of
> We just bought a new spectrum analyzer from Agilent which
> with all the options we got only cost around 55,000. This unit
> is an N9020A and its very accurate.
Yes, that's a beautiful instrument, Brett. I guess my comments were directed
toward the 1000's of older conventional analyzers out
If it were within +/- 2.0dB absolute accuracy I'd be tickled pink.
However your comments about spectrum analyzers today are a bit dated.
Power meters are becoming much less crucial for getting accurate
readings.
We just bought a new spectrum analyzer from Agilent which with all the
options we go
> Are there any thoughts as to the accuracy level in dBm in correlation
> with this mod? As well as any sort of absolute accuracy specs on what
> we expect to see with this box?
The absolute accuracy will almost certainly not be better than about +/- 2.0
dB... which is the best that spectrum ana
Are there any thoughts as to the accuracy level in dBm in correlation
with this mod? As well as any sort of absolute accuracy specs on what
we expect to see with this box?
On Tue, 2009-09-22 at 16:58 -0700, Alan Bloom wrote:
> On Tue, 2009-09-22 at 19:08 -0400, amstel78 wrote:
>
> > So would it
On Tue, 2009-09-22 at 19:08 -0400, amstel78 wrote:
> So would it be advisable to wait for the P3 to come out before
> performing this modification? If it's not really needed, then what's
> the point? My antenna system isn't that great anyway...
I need to do some more experimenting to get a bett
hi, fellow elecrafters,
if you should have a problem with the 13 kOhm resistor,
take two.
47k in parallel with an 18kOhm resistor, both SMD, solded together as
piggyback onto the solderpads.
It fits great.
73 from Germany
Hans, DF5SR
_
On Tue, 2009-09-22 at 08:22 +0100, Ian White GM3SEK wrote:
> (Also a query about the resistor value: does it truly have to be 13K?
> Is this potential divider so critical that it cannot use one of the
> readily available standard values of 15K, 12K or even 10K?)
No, the exact value is not criti
Dave G4AON wrote:
>
>Bill W4ZV wrote:
>
>>When the mod was first published I asked:
>>"Just checking to see if this is a typo. 13K or 12K?"
>>
>>Bob Friess N6CM (the 1st mixer designer) replied:
>>"13K is a standard 5% value and is correct."
>>
>>I took the 5% tolerance to mean the value is somewha
13k is a standard value in the progression of 5% resistors (10, 11, 12,
13, 15, 18, 20, etc.). It is difficult to get 10% resistors anymore,
and 5% tolerance is normally used.
If your local parts source does not have them, perhaps they are only
stocking those values from the list of 10% toleran
There is about 0.2 dB difference between using one value or the other,
depending on the accuracy of your model.
73 Dave, G4AON
K3/100 #80
--
Bill W4ZV wrote:
When the mod was first published I asked:
"Just checking to see if this is a typo. 13K or 12K?"
Bob Friess N6CM (the 1st
On Tue, 2009-09-22 at 03:50 -0700, Bill W4ZV wrote:
>
> When the mod was first published I asked:
> "Just checking to see if this is a typo. 13K or 12K?"
>
> Bob Friess N6CM (the 1st mixer designer) replied:
> "13K is a standard 5% value and is correct."
13k is not standard in the bag of SMT
James Sarte wrote:
> I've already done most of the
> hardware mods, but SMD stuff I refuse to deal with.
I too was extremely nervous about those little smd parts but I
eventually plucked up courage and found it astonishingly easy. You just
need plenty of light, a fine bit, tweezers and a magnify
Ian White GM3SEK wrote:
>
> (Also a query about the resistor value: does it truly have to be 13K?
> Is this potential divider so critical that it cannot use one of the
> readily available standard values of 15K, 12K or even 10K?)
>
When the mod was first published I asked:
"Just checking to
K2QI wrote:
>
> 2.If I do decide to buy the panadaptor, can Elecraft perform this
> modification for me if I send the radio back? I've already done most of
> the
> hardware mods, but SMD stuff I refuse to deal with.
>
>
I entirely understand your concern, but having plucked up the courag
I find removing surface mount resistors, at least on the underside of
the K3 main board, quite simple. It's easier than removing wire ended
resistors from plated through holes! Remove the bulk of the solder from
each end of the component with solder wick, the heat from the iron will
often have migr
Alan Bloom wrote:
>It's an easy mod. Just remove one surface-mount resistor (cut it in
>half with side cutters
That is a very risky technique - cutters apply a very large and
uncontrolled force which can easily tear up the solder pads.
It is much safer to melt the solder at both ends of the re
On Mon, 2009-09-21 at 22:15 -0400, James Sarte wrote:
> I've just gone through the last 800 or so recent reflector messages (I
> haven't downloaded my email in a few days), and not a single one was devoted
> to this hardware modification. I have a couple of questions:
>
>
>
> 1.What is this
> 1.What is this mod for? I'm assuming it's for the Elecraft panadaptor,
> but why do we need to mod the K3? Couldn't the IF output be amplified by
> the panadaptor? I'm not really comfortable cutting stuff out of my 4
> thousand dollar investment.
>
In some circumstance, the IF output le
I've just gone through the last 800 or so recent reflector messages (I
haven't downloaded my email in a few days), and not a single one was devoted
to this hardware modification. I have a couple of questions:
1. What is this mod for? I'm assuming it's for the Elecraft panadaptor,
but why d
Hello Eric,
Since I plan to purchase and connect my K3s to the P3, I would like to make the
R8 resistor value change ahead of time. Please tell me which board this
resistor is on, and let me know if this mod will be posted in K3 Resources and
if the resistor will be made available to purchase t
Mike,
Do you have a known good receiver that will tune 8.215 MHz? If so, use
it to listen to the K3 IF output. If you hear signals on that receiver
as you tune the K3, then the K3 IF output is working.
You said the Softrock was *not* working. The Softrock will have to work
before you can us
Is the IF output on all the time? I have a softrock that isn't working, and
was wondering if I was even getting an output.
I built the softrock, and have Jack Smith's Buffer Amp, feeding to an
EMU-0202 USB sound card. Rocky and PowerSDR-IF do not appear to display
anything but
noise, but then I
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