so no more phase noise limitation in DR and IMD?...that's gonna be fun, coz now
there is a lot of buzz with new 7850 super low noise LO, so 200 bucks update K3
is gonna stay shoulder to shoulder with a 10k limited quantity radio...so here
is my bet...won't wait for test results and gonna order 2day...
vy 73 de VE3GNO Daniel
From: Johnny Siu <[email protected]>
To: Wayne Burdick <[email protected]>; Elecraft Reflector
<[email protected]>; "[email protected]"
<[email protected]>
Sent: Friday, February 13, 2015 9:42 AM
Subject: [Elecraft] Upgraded K3 synthesizer module now available: The KSYN3A
Hello Wayne,
It is good to see improvement in RX phase noise which will affect the
reciprocal noise mixing.
Could you put the improvement in layman terms? For example, in the original
KSYN3, a weak CW signal could be heard 10Khz away from a S9+60db signal, under
the new KSYN3A, what improvement can I expect? Will it be now heard 1Khz away
from the S9+60db signal?
It would be better for you to give examples in this way so that for a non-radio
profession like me, can understand the improvements.
73
Johnny VR2XMC
寄件人︰ Wayne Burdick <[email protected]>
收件人︰ Elecraft Reflector <[email protected]>;
"[email protected]" <[email protected]>
傳送日期︰ 2015年02月13日 (週五) 2:07 PM
主題︰ [Elecraft] Upgraded K3 synthesizer module now available: The KSYN3A
The KSYN3A synthesizer module for the K3 is a completely new design that
improves on the original KSYN3 in several ways. All K3s shipped on or after
January 23, 2015 already include the new synthesizer (serial number 8801 and
later).
See feature list below. Ordering and installation instructions can be found
here:
http://www.elecraft.com/order_form_parts.htm#K3%20Parts
* * *
NOTE: If you wish to upgrade a K3 that includes the sub receiver (KRX3),
you'll need two (2) KSYN3A modules, since the synthesizers for both receivers
must be of the same type.
* * *
KSYN3A FEATURES:
* FASTER CW BREAK-IN AND MORE ACCURATE CW TIMING
A dedicated coprocessor on the module permits faster transmit/receive
switching, improving CW timing accuracy with both internal and external keying.
This also speeds up receive recovery between elements.
* ULTRA-LOW PHASE NOISE
The KSYN3A significantly improves the K3's already excellent receive and
transmit phase noise characteristics at close carrier spacings. This, in turn,
improves its close-spaced receive dynamic range, yielding even better weak
signal detection in the presence of strong signals. In transmit mode, the
KSYN3A keeps the signal exceptionally clean, further enhancing K3 performance
at multi-transmitter stations, Field Day and DXpeditions.
* 600-METER COVERAGE
The new synthesizer provides complete coverage of 600 meters -- and below. VFO
tuning extends down to 100 kHz, with sensitivity gradually falling off below
450 kHz. Receive sensitivity (MDS) at 475 kHz is typically -120 dBm at the RX
ANT IN jack. Transmit output of about 1.0 mW is available for use with a
suitable external amplifier. (Note: 600-m allocations vary by country.
Operation on this band requires the KBPF3 and KXV3 options. For receive-only
use, an antenna can be connected to the RX ANT IN jack on the KXV3 module. For
transceive operation with an external amplifier, use the XVTR IN and XVTR OUT
jacks, and set CONFIG:KXV3 to TEST.)
* EXCELLENT MECHANICAL STABILITY
The KSYN3A is virtually immune to both physical vibration and magnetic
coupling, and operates over a very wide temperature range with no change in
performance. K3 kit construction is simplified, as the KSYN3A requires no
alignment of any kind.
* * *
73,
Wayne
N6KR
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