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eHam Forums / SWL (Shortwave Listening) / RE: Smart looking new receiver
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on: February 05, 2013, 03:39:50 PM
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The CR-1 specs are really buried in that website: --------------------------------------------- "Product Information
Introducing the New CR-1 Communications Receiver
The CR-1 is a small, low-power, ruggedly constructed radio receiver that is finding a niche in the world of SWL’s (short wave listeners) and amateur radio enthusiasts alike.
The CR-1 is a new Software Defined Radio (SDR) from the designers of miniature wideband signal intelligence receivers, developed for special-operations units, and rugged business-jet data-link transceivers.
The CR-1 SDR is independent of a host PC, using embedded digital signal processing technology providing a degree of portability and performance previously unavailable to the radio enthusiast.
As one potential customer noted: “It’s an SDR with knobs, keys, and a display!”
Frequency Coverage and Modes:
MW-HF: General Coverage: 500 kHz - 30.000 MHz
User Configurable Band Key: Amateur Band Selections: 160 m – 10 m International Broadcast Bands 120 m – 11m AM-SSB-CW auto-mode-selection (based on tuned frequency) with user-override. International Broadcasting: auto-select AM - 5 kHz steps - cursor override Auto-Filter Width select with override: AM: 6 and 7.5 kHz kHz/SSB: 2.6 kHz/CW: 1 kHz Tuning Resolution (cursor control): 1 MHz / 100 -10 - 1 kHz / 100 - 10 Hz
VHF-UHF General Frequency Coverage:
VHF: Continuous Coverage: 64.0 - 225.0 MHz UHF: Continuous Coverage: 437.0 – 468.0 MHz Automatic standard frequency steps for each band Cursor Controlled (override) Tuning Resolution : 1 MHz / 100 - 10 - 1 kHz
VHF-UHF Band Plan:
Aircraft Band: 108.000 - 136.975 MHz, AM auto-select -25 kHz channel steps Amateur: 2 m, 1.25 m, 70 cm (upper portion starting @ 437.0 MHz); with user selectable standard frequency steps. NBFM mode default with SSB-CW mode selects. Note 6 m (54 MHz) is not available. Marine & NOAA Weather Radio Public Service: 137.0 - 225.0: 12.5 and 25 kHz steps. NBFM default. FRS-GMRS 462 – 467 MHz , NBFM - 25 kHz Steps
Receiver Architecture
HF: Dual conversion (VHF-UHF: single conversion) with low-IF , I-Q digital sampling, 32-bit DSP with digital audio CODEC
DSP demodulation algorithms: DSB-AM, SSB, CW, WBFM, NBFM
DSP scalable, fixed bandwidth channel filtering
Audio System – (Digital CODEC)
Speaker Driver: 0.8 W into 8 Ohm load Internal 2.5” diameter, Mylar communications grade speaker External monaural speaker jack (3.5 mm stereo jack - back panel) Headset Driver: 40 mW into 16 Ohms. (3.5 mm stereo jack - front panel)
Antenna Inputs
MW-HF Port: 1000 Ohm – 3.5 mm jack (auto-detection) MW-HF Port: 50 Ohm – BNC (female) VHF-UHF Port: 50 Ohm – BNC (female)
Display
64 x 128 OLED Display with EMI-filtered lens Readable outdoors and manually dimmable
Power Inputs
USB and 6-18 VDC – 2.1 mm diameter center pin (positive) jack
Power Consumption
< 1.0 Watt
USB
Mini-B –USB 2.0 Jack (powered): Downloadable software updates from CommRadio Website
Mechanical
Overall Size: 5.64” W x 2.43” H x 6.10” D (including knobs, jacks , feet) Weight: 1 lb – 12 oz Knobs: Machined Aluminum – Black Anodized Front Panel: Machined Aluminum – Powder Coated – Black semi-gloss Case: 20 Gauge Steel, Powder Coated – Black Crackle.
ESD Protection: ESD Diodes: Antenna ports - Power Jacks - USB Port-Keys – Knobs
Hardware Design Limitations:
The CR-1 is not controllable over USB by CommRadio or third-party software at this time. I-Q analog and/or digital IF signals are not ported to the rear-panel or accessible or at a standard sound-card sampling rate. Both of these options may be added, provided demonstrated interest
Software Demodulators Not embedded in the CR-1 at this time:
Mono or Stereo FM broadcast Demodulator P25 or Trunk Radio D-STAR DRM
Always Free: Planned Software Upgrades:
SW revisions and upgrades (improvements) FM broadcast demodulator (US and International) European Band Plans: MW- 9 KHz Frequency Steps
Potential New Software Applications (provided free if they occur, but not guaranteed to all new customers in 2013):
Spectral Display (across individual bands) – fast detect of band openings CW reader ported to display and over USB PSK-31 decoder ported to display and over USB. Tell us what you want.
Origin & Warranty
Designed and manufactured in USA Limited 1 year warranty on parts – labor – workmanship
Warranty"
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122
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eHam Forums / SWL (Shortwave Listening) / RE: Smart looking new receiver
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on: February 05, 2013, 02:09:44 PM
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So who in the heck is Don Moore N0HDX? Let's see: "It draws on my experience as a kid building Knight Kits, from my paper route earnings through currently owning a classic Drake 2B and a Zenith Transoceanic; my benchmarks for enjoyable, high quality short wave listening. "Then he adds an hefty aluminum knob. And Voila, a cutting edge SDR radio! From his Eham bio: " I now develop commercial grade, aviation (VHF) transceivers and plan to intorduce [sic] a SSB rig hopefully in 2003/2004. 73, N0HDX, Don" Anyone know this guy or anything about his background? Has a general class license apparently. Here's some discussion on an SWL site: http://swling.com/blog/2013/01/commradio-is-introducing-the-cr-1-a-new-tabletop-shortwave-receiver/
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124
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eHam Forums / Misc / RE: The Kenwood 990. A new HF operating paradigm
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on: February 03, 2013, 10:27:40 AM
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Google how our submarine fleet stays in communication. (And that fantastically long underground antenna system...) Any sub communications experts here? Am I correct that ELF radio only penetrates a short distance underwater so submarines must approach the surface to communicate. Also helps that those communications stations around 25 kHz run enormous power. They (stations in N.Dak and Maine) are quite loud at my QTH even using a sound card as a receiver.
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125
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eHam Forums / SWL (Shortwave Listening) / RE: LYQ Navigational Beacon coming in strong on 530 KHz.
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on: February 01, 2013, 04:06:36 PM
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Has the LYQ beacon in Tennessee on 529 kHz shut down?
I haven't heard it for some time. A longwave group post said LYQ was considering shutting down. And I've carefully listened for it the past two days.
The ham who owned it considered it to be more of a service to SWLs and hams from what I could understand. NDBs are pretty obsolete as aircraft navigation devices.
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129
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eHam Forums / SWL (Shortwave Listening) / RE: Remember SWLing when it was fun?
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on: January 30, 2013, 06:49:55 AM
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"1. Radio Moscow used to send you "awards"?" Don't know about you Komrad but they never gave ME any awards.  --------------------------------------------------------------------------------- - Others listened to Radio Moscow; I ONLY listened to Ronald Reagan on TV  - You built the receiver you used - In my case the above receiver ONLY picked up CHU Canada - Re-tuned the family AM radio above and below its intended range - You pretty much got electrical shocks from everything - You knew nothing about antennas - No one knew anything about antennas - When you owned zero test equipment or tools - Only electronic genius you knew was the TV repair guy - Took bus to ham/surplus stores - (If ham) lived in utter fear of the FCC. I actually got two Pink Tickets. (Heath VFO, ya know) - Bought replacement tubes at Walgreens - All the good AM stations began with "X." - Local AM (KWK in St Louis) ended the scourge of Rock n Roll with this: [ http://www.youtube.com/watch?v=N92bt6W30UI ]
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130
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eHam Forums / Hamfests / RE: ARRL Midwest Convention November 2013
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on: January 26, 2013, 10:11:00 PM
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I'm old enough to remember when those conventions would take over the Chase Hotel here, once the finest hotel west of Chicago.
Congrats to the Lebanon radio group. Heck, that facility looks better than Dayton. The location isn't far from the Lake of the Ozarks and Branson.
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131
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eHam Forums / Hamfests / RE: ARRL Midwest Convention November 2013
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on: January 26, 2013, 11:11:39 AM
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"It will be held in November 2013 in Lebanon, Missouri." Now I live in St Louis MO and my first question: Where the heck is Lebanon MO? By car it's 150+ miles away from me, down hwy 44, and pretty far from Kansas City, too. Their convention center looks nice, at least. Guess the convention will be convenient... for the 14,000 people who live in Lebanon 
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132
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eHam Forums / Antennas and Towers and more / RE: Zero-Five vs. DX-Engineering 43 ft - Build Quality
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on: January 26, 2013, 06:45:09 AM
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"What do you do when using the DX Engineering plate when the bolt (that's never been removed) hangs up in the groove on the plate while your in the middle of walking the antenna up or down?" Happened to me quite a few times with my DXE plate in the 3+ years I've had the antenna. Replaced the bolts several times. Much easier to happen with their 43' verticals than with small verticals, like a Hustler. You do get better with practice. Best to use two people and wait for a calm day.
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133
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eHam Forums / SWL (Shortwave Listening) / RE: in apartment swl antenna (aka aerial)
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on: January 24, 2013, 12:26:33 PM
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I lived in about the tallest high rise apartment building in St Louis for many years. Luckily I had a nice balcony on the 18th floor and windows that opened. Radio signals did not penetrate it. I actually spoke (on the air) to a ham who was a main design engineer on its construction years before. He assured me it was VERY well built from concrete and steel beams. I've lived on the south side of the building. You could hear almost nothing from the north.
In such a building you'd probably be best to tape wire along a window or use the metal window frame. Who knows how a loop would work near metal beams hidden in concrete? Or even closer to metal lath in walls?
The trick is to experiment. Yes, a piece of wire out a window may work as well as anything.
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134
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eHam Forums / SWL (Shortwave Listening) / RE: in apartment swl antenna (aka aerial)
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on: January 23, 2013, 06:44:13 AM
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You're providing almost no info.
What frequencies and services are you most interested in? Do you currently live in this apartment? Main goal of an apartment antenna is usually to reduce man made noise which is often the major limiting factor. Can you run a simple thin wire out a window? What floor in this apartment are you on? What kind of receiving equipment will you use? If it is a tall building, what is is made from?
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135
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eHam Forums / Elmers / RE: How much of a help is 6 DB?
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on: January 18, 2013, 02:51:14 PM
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But to condense it: 6 DB = 1 S unit That may have been true 60 years ago. On my TS-850 I came up with an S-unit being about 4.7 dB and only on the middle portion of the scale. Difference between say S-2 and S-3 was much less. And I was only testing on 40 meters where I was trying to get an accurate determination of the performance of my array of phased verticals. S-meters can vary by band or even by frequency within a band according to one article.
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