Fred,
Is that "K3S" or multiple "K3"s?
All The K3S have the mod, as well as later K3s. If an early K3, then
you may need the mod.
73,
Don W3FPR
On 10/4/2019 8:59 PM, Fred Massey wrote:
I knew I had an issue when I could hear signals on the K3s that weren’t
showing on the waterfall.
I need to engage Elecraft tech support to see if I need the mod for my K3s,
and see what they say about using an external buffer amp or preamp.
When I posted, I thought this might be a common problem that others had
fixed before.
On Fri, Oct 4, 2019 at 6:59 PM Bob McGraw K4TAX <[email protected]> wrote:
I read that folks have successfully used the Clifton buffer amp.
Certainly worth a try. Others have indicated only about 6 dB of gain is
needed.
The software I use for my RSP-1 allows RF Gain changes. Thus with the
lower IF output of my K3S, I just raise the gain of the RSP-1 via the
software. I've never considered the SDR receivers of that type to be very
precise with regard to "calibration". Although some seem to think they
can split hairs on a mosquito with the level and frequency accuracy of the
receivers. I do not consider them of instrumentation quality, thus
anything +/-10 dB is deemed satisfactory. Likewise the same with frequency
accuracy. Others may have different experiences with different receivers.
73
Bob, K4TAX
On 10/4/2019 6:34 PM, Fred Massey wrote:
A friend of mine, Tim AB4B, suggested that I might need a buffer amp to
keep the IF being pulled down by the sdr. DXEngineering sells the Clifton
Z10000. That adds about 6db of gain, but maybe the buffering that it does
has an even bigger effect.
On Fri, Oct 4, 2019 at 2:18 PM Bob McGraw K4TAX <[email protected]>
wrote:
In a word, YES. I find that to be true with my K3S as well as other
brands/models of radios. Thus you'll need about 20 dB of gain in the
form of a preamp between the IF output and the QSR receiver.
73
Bob, K4TAX
On 10/4/2019 12:57 PM, Fred Massey wrote:
Some. I was planning on sending an email to Elecraft support with the
s/n
of my K3s to see if I needed the mod. The difference I’m seeing in
signal
strength is about 20+ dB. Is it normal for the if-out to be weaker
than a
direct connection to the antenna?
73,
Fred
AE4ED
On Fri, Oct 4, 2019 at 12:44 PM Don Wilhelm <[email protected]>
wrote:
Fred,
Have you looked the K3 IF Output mod?
https://ftp.elecraft.com/K3/Mod%20Notes%20Alerts/IF_Output_Buffer_Gain_Mod_Rev_A.pdf
If you don't have the 13k SMD resistor or a 1/8 watt 13k resistor, you
can order the kit from Elecraft.
73,
Don W3FPR
On 10/4/2019 1:24 PM, Fred Massey wrote:
Good afternoon Wes and all,
If I connect the antenna directly to the QSR-1, I get the same signal
level
as the K3s. But, when I connect to the QSR-1 to the IF-out, the
signal
is
about 4 s-units less.
Any ideas...anyone?
Fred
On Thu, Oct 3, 2019 at 4:14 PM Wes <[email protected]> wrote:
I use an SDR-IQ on the i-f output on my (very) early K3S. it works
fine.
IIRC,
always a dubious proposition, I did the mod on my original K3 and it
worked well
too without any additional amplification. I think you have another
problem.
Wes N7WS
On 10/3/2019 2:01 PM, Fred Massey wrote:
Good afternoon,
I have successfully connected my QSR-1 to my K3s if-out, and
immediately
noticed the signal strengths showing on the QSR-1 were much
weaker. I
probably have an early K3s, so the if-out signal strength is even
weaker.
Any recommendations at a good preamp to use? It seems like 20db is
what
I
need:
73,
Fred
AE4ED
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