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R303 VHF FM Receiver

VHF FM RECEIVER USES LOW NOISE FREQUENCY SYNTHESIZER

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 R303 is our 9th generation vhf 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.

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.

This new vhf receiver proudly combines the best features of its highly acclaimed predecessors.  There are two differences between the R303 and its predecessor, the R302.  The volume and squelch controls are trim pots on the board rather than panel mounted pots.  Most customers find this provides easier mounting and keeps controls away from prying hands.  The synthesizer uses a microcontroller which has the frequency directly programmed into it at the factory so there are no dip switches to deal with.  For those applications requiring more than one frequency, we can actually program in up to four channel frequencies which can be selected by jumpers on the board or an external switch.

The R303 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 excellent 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 several years ago!  In fact, you don't need a crystal oven; so it saves you $45 over a comparable crystal controlled unit.

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 available:
    • 138-175MHz
    • 216-230MHz
    (Component values are dependent on exact frequency.  Units are tuned to your frequency at the factory.)
  • Frequency Stability: TCXO (temperature controlled xtal oscillator)  provides  temperature stability of ±2ppm over a temperature range of -30°C to +60°C.
  • Sensitivity (12dB SINAD): 0.15 - 0.2µV
  • Squelch Sensitivity: 0.15µV
  • Normal signal bandwidth: ±5 kHz deviation
  • Modulation Acceptance: ±7.5 kHz
  • Adjacent Channel Selectivity: ±6kHz at -3dB, ±12 kHz at -100dB!  (Narrower or wider bandwidth available on request)
  • Image Rejection:  60-70dB
  • 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 38-100 mA, depending on audio level.
  • Size: 4 in. W x 2-1/2 in. D
  • Shipping Weight: 1 lb.

See what customers have to say:

The receiver kit arrived and I placed it into service 3 weeks ago. It has transformed our RT use. We are no longer getting the large amounts of cross-mod and spurious interference we used to get on the 40 year old receiver we had previously.
Your instruction were very clear and no difficulty was experienced in getting the rx kit running.
Many thanks for your assistance.   ...Ross ZL3TFK

I just wanted you to know that I'm really impressed with my new R-302 receiver. My 12 year old R-301 is an excellent receiver but the new R-302 pulls stations in loud and clear that were barely a whisper on my R-301. I don't believe there is any receiver out there that can top this one. It seems that you guys took receiver sensitivity to the theoretical limits.  ...J. B., Tannersville PA

The R303-2 receiver I ordered and installed is fantastic.  Thank you so much for helping me meet my time frame goals by having a new receiver at our repeater site by the date I requested. ...Eugene C. Patrick, NA8I

I'm very impressed with the receiver. Great selectivity (no adjacent channel interference), excellent sensitivity (no white noise), and surprisingly good audio quality.  I'm very happy with its performance.  Thanks for recommending it....James Bade, Mount Pocono, PA

Features include:

  • Factory programmed frequency with 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.


Top View of Board
(click for large image)


Bottom of Board
(click for large image)

PRICES:

R303 Factory Built Receivers .... $229.00

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

Narrowband Filter Option: for applications using 2.5kHz deviation instead of 5kHz .... $30.00

Tuning Tool.  Hex tool used for alignment...$6.00
RF plug & cable to connect to board.
A40 115VAC/12Vdc Power Adapter to power this unit ...$10.00