[Elecraft] KRX3 insatall

[Mike Reublin]

Is that the addition across R91 if R91 is greater that 22 ohms? IF out would affect the P3, not audio volume, right?

Mike NF4L

On Oct 31, 2012, at 5:55 PM, Brian Alsop <alsopb at nc.rr.com> wrote:

> If one looks at the schematic there is a JFET buffer between the IF and 
> the IF out in the main RX.  Isolation and impedance matching is its 
> function.  There is no stock IF out for the subrx and hence no JFET.
> 
> JFETs have really high input impedances.
> 
> A one resistor "gain mod" is on the K3 site reduces the signal loss in 
> this JFET stage for those using the IF output jack.
> 
> 73 de Brian/K3KO
> 
> On 10/31/2012 21:10, ab2tc wrote:
>> Hi,
>> 
>> I have absolutely no dip in the center of my LP-Pan display and I have never
>> heard anybody else having this problem either. The IF out port and the
>> crystal filter bank are driven in parallel by a buffer amplifier that
>> appears to be capable of driving both without gain loss due to the crystal
>> filter load.
>> 
>> AB2TC - Knut
>> 
>> 
>> Edward R Cole wrote
>>> I built my K3/10 and installed the KRX3 with no issues of different
>>> audio levels.
>>> 
>>> BTW running both Rx with dual LP-Pan on MAP65v2.3 sw shows the audio
>>> level on a bar graph for each (when in diversity mode).
>>> 
>>> Two things were recently done to improve use of the
>>> LP-Pan:  1)  Enabling an open filter position in the K3 and KRX3
>>> eliminates gain "suck out" by roofing filter which is connected in
>>> parallel with the IF output jack.  It shows as a dip in gain on a
>>> panadaptor spectrum display at center freq.  2)  Installed 32.860 MHz
>>> xtal in LP-Pan which is 4x the IF freg of 8.215 MHz which eliminates
>>> the previous +6 KHz freq. off set in the display sw (thanks to Larry,
>>> N8LP).
>>> 
>>> My 2m-eme dual-polarity adaptive receive system will get a work-out
>>> in this weekend's eme contest.  It extensively uses the dual-Rx
>>> diversity reception mode of the K3.
>>> 
>>> 73, Ed - KL7UW
>> 
>> 
>> 
>> 
>> 
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> 
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