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SS-40
40M High Performance
Superhet Receiver
Designed by Jim Kortge, K8IQY
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Announced at OzarkCon 2011
Kitted and Offered For Sale By The Four State QRP Group
The SS-40 high performance receiver is the latest design effort from Jim Kortge, K8IQY. SS stands for "Stable and Sensitive".
It exhibits the signature IQY extremely quiet amplifier chain. Disconnect the antenna and the receiver's noise floor is almost undetectable. A matched crystal IF filter provides a
steep sided 500 cycle bandpass and outstanding opposite sideband rejection. Covering the 40M QRP "watering holes", a Super VXO provides 25-30 kHZ of smooth stable tuning, and no perceptible drift even from a cold start..
While easy to build, this is not a trivial kit. There are 150 parts, and when completed the resulting high quality receiver is a pleasure to use.
Intended as a companion receiver for the NS-40 transmitter, a Magic Box TR system between the SS-40 and NS-40 allows effortless transceiving, and RIT results since the receiver is independently tuned.
First time builders please note: This kit
is not difficult to build. All parts are through hole except the main
mixer, which is an easy to solder large footprint SMT part.
The parts are wide spaced on the board making installation easy, and all connectors are board mounted
which eliminates point to point wiring. After all the parts are installed it's ready to try out.
Specifications and Design Features
Sensitivity (MDS): -132 dBm Spectacular, nearly all the big rigs on this list
are less sensitive (without their preamps) than is the SS-40.
Selectivity: 500 Hz IF Filter with great skirts.
Opposite Side band Rejection: Outstanding, greater than 50 dB!
Noise floor: Incredibly quiet! 45 dB below the 40M average noise floor, and 20dB quieter than the famed 2N2 series.
Audio stage: Drives speakers to undistorted, clean, room filling volume, or use earphones.
Tuning Range: 25-30 kHz of stable, smooth, and easy tuning.
Super VXO: Three crystals and NO PERCEPTIBLE DRIFT! Not even from a cold start!
Audio Derived AGC: That is smooth, very effective, pleasant to hear, and easy on the ears.
Documentation
Assembly Manual, 10K Tuning Pot Version For kits shipped since 27 June 2011
Assembly Manual In Spanish Translation by Jon Iza EA2SN, thank you Jon.
Assembly Manual In Japanese Translation by Kyonosuke Hiroi JHØCCK, thank you Kyonosuke-san.
Assembly Manual, 5K Tuning Pot Version For kits shipped before 15 June 2011
Radioafionados Article. Authored and Translated by Jon Iza EA2SN, thank you Jon.
Assembly Manual In Spanish, 5K Tuning Pot Version Translation by Jon Iza EA2SN, thank you Jon.
Schematic
Parts Inventory List from Rich Fowler K8MEG
Parts List
Click to download
WB8RCR's Dial Maker program. A generic dial can make an effective
frequency
dial when used
with a calibration chart such as this one.
K9PL's Review
in the K9YA Telegraph (posted here with permission) Thank you Philip.
Elecraft's Excellent Capacitor Identification Page Posted with permission.
Electronics 2000 Resistor Code Graphic calculator Posted with permission.
Ten Tec TP-41 Enclosure Drill Template
SS-40 Photo Page
Front Panel Label
IF Filter Response Curve
Tuning Pot Kit For First run only.
Kits shipped after 25 June 2011 do not need the kit.
Ordering Information: ... The cost of
this kit is $60 for US orders and $65 for DX orders. Shipping cost is included in the price.
Pay With PAYPAL
7.040 MHz Option
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Pay With PAYPAL
7.122 MHz Option
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Shift your 7.040 SS-40 to
7.122 With These Crystals.
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Or pay by check or money order (US dollars only) please make it out to "Four State QRP Group" and send to:
Four State QRP Group
Ron Potter, AG1P
274 Black Hawk Road
Forsyth, MO 65653
The SS-40 is carefully kitted and shipped by Wayne Dillon, KCØPMH.
Please direct kit and part related questions to wayne
All proceeds are applied toward funding OzarkCon. Thank you for supporting The Four State QRP Group.
Expanded Spectrum Systems is an excellent source for QRP crystals.
Click here for their crystal information page
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