Sunday, December 5, 2010

The Alinco DR-235 TMK III

I’m hoping to purchase an Alinco DR-235 TMK III in 2011. Why you may ask? Just because it is the only mobile rig that dose the 1.25 meter band (220 MHz). The 220 MHz is a portion of the VHF radio spectrum allocated for amateur radio use in ITU Region 2, comprising frequencies from 222 MHz to 225 MHz in the United States (with the addition of 219–220 MHz on a limited, secondary basis) I’m still needing to research the meaning of that.
It just seems to me that 2 meters is very crowded and 440 gives me heartburn, so I am gonna try 220MHz.

The Alinco DR-235 TMK III features;

Frequency range RX; 216-278 MHz (after modification: RX/TX 200-299.995 MHz depending on VCO alignment)

TX; 222-225 MHz

Modulations;
RX FM / N-FM
TX FM / N-FM

Sensitivity;0.25 µV (12 dB SINAD)

Selectivity;
FM: 12 kHz (-6 dB), 28 kHz (-60 dB)
N-FM: 6 kHz (-6 dB), 14 kHz (-60 dB)

Aerial; 50 Ω, SO-239

RF-Output; High: 25 W, Medium: 10 W, Low: 5 W

Memories;101 channels in 1 banks

Power requirements;13.8V DC

Current drain RX; Max 600 mA

TX; Max 8 A

Dimensions (w×h×d); 142 × 40 × 174 mm (5.59 × 1.57 × 6.85 in)

Weight; 1000 gr (2.2 lbs)

Features;
CTCSS, DCS and DTMF. 1K2/9K6 TNC option. Theft alarm Digital voice board option (requires at least two similarly equipped radios)
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Counter Added January 1, 2011

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HOW TO READ PROPAGATION NUMBERS

The A index [ LOW is GOOD ]

  • 1 to 6 is BEST
  • 7 to 9 is OK
  • 11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Ap-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

  • 70 NOT GOOD
  • 80 GOOD
  • 90 BETTER
  • 100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of 60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

  • 0 or 1 is BEST
  • 2 is OK
  • 3 or more is BAD
  • 5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet) over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

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