Commercial and Amateur
VHF & UHF Radio Equipment
Providing innovative solutions for 45 years!

Features include:

• Dip switch frequency selection, 5 kHz resolution.
• Very low noise synthesizer for repeater service.
• Commercial grade tcxo for tight frequency  accuracy in wide range of environmental  conditions:  2ppm -30 to +60°C.
• In stock for same day shipping.

The R305 UHF FM Receiver is a  tough, commercial-grade, receiver which answers the need for the most demanding applications.  It has very good sensitivity and selectivity.  It is ideal for voice operation in repeaters and voice links. Used with our data demodulators, it makes a handy link for computer controlled equipment or a reliable telemetry link in place of expensive phone lines.

Our new uhf receiver proudly combines the best features of its highly acclaimed predecessors, and it allows instant frequency setting without waiting for channel crystals!

There are some jobs a transceiver grade receiver just can't do, at least not well. That's where reliable Hamtronics® commercial quality receivers come in!

The R305 retains all of the popular features Hamtronics® receivers have been noted for.  It uses triple-tuned circuits in the front end and excellent crystal and ceramic filters in the i-f with steep skirts for close channel spacing or repeater operation. The i-f selectivity, for instance, is down over 100dB at ±12 kHz away from the carrier, which is 40-50 dB better than most transceivers. Low noise fet's in the front end provide good overload resistance and 0.15µV sensitivity. You won't need a preamp with this receiver!

By careful engineering and economies of scale, we were even able to keep the price about the same as crystal controlled receivers sold for, even years ago!  Since the unit uses a tcxo with 2ppm stability, no crystal oven is needed to get good stability.  That actually saves cost over an equivalent crystal controlled model.

The R305 is our 5th generation uhf fm receiver, and it packs in features you've told us are important to you during our 40+ years of designing receivers. It's up to the difficult jobs you've told us you have.

Able to hear weak signals, resistant to intermod, desense, and adjacent channel interference, easy to interface, instant channel frequency setting.  Isn't that what you need for your demanding applications? 

Specifications:

• Frequency Ranges: 
  • Model R305-0     400.000 – 409.995 MHz
  • Model R305-1     410.000 – 419.995 MHz
  • Model R305-2     420.000 – 429.995 MHz
  • Model R305-3     430.000 – 439.995 MHz
  • Model R305-4     440.000 – 449.995 MHz
  • Model R305-5     450.000 – 459.995 MHz
  • Model R305-6     460.000 – 469.995 MHz
• Frequency Stability: ±2ppm over a temperature range of -30°C to +60°C.
• Sensitivity (12dB SINAD): 0.15µV
• Squelch Sensitivity: 0.15µV
• Modulation Acceptance: ±7.5 kHz
• Adjacent Channel Selectivity: ±6kHz at -3dB, ±12 kHz at -100dB!  (Narrower or wider bandwidth available on request)
• Image Rejection:  60dB
• IF Filters: 8 pole 10.7 MHz crystal filter plus 455 kHz ceramic filter.
• Audio Output: 1 Watt (8 ohms).
• Operating Power: +13.6Vdc at 42-200 mA, depending on audio level.
• Size: 4 in. W x 2-7/8 in. D (plus pot. shafts)
• Shipping Weight: 1 lb.

Top View of Board (click for large image)

Bottom of Board (click for large image)

PRICES:

R305 Factory Built Receivers ... $229.00

Note:  Some retuning is necessary when changing frequencies.  Please specify the frequency you want to operate on so we can tune the unit for you before shipping.)

A28 Coil Alignment Tool .........$6.00

A2 Capacitor Alignment Tool ...$6.00

A5 RCA plugs.  A special rf type plug with cable clamp...$1.00/each

A27 Miniature Coax Cable ...6ft/$3

A91 Monitor Speaker ............. $15.00