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Reviews Categories | Receivers: Commercial/Military/Marine adaptable to ham use | Collins ARR-41 R648 Receiver Help

Reviews Summary for Collins ARR-41 R648 Receiver
Reviews: 2 Average rating: 5.0/5 MSRP: $unknown
Description: 190-550Hz & 2kHz to 25mHz receiver. Dual conversion above 4kHz. 2 RF and 3 IF stages with 6.1kHz and 1.4kHz mechanical filters at IF of 500kHz. Full time noise limiter (no off function) for AM & CW reception. Mechanical digital frequency readout and built-in crystal calibrator
Product is not in production.
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N8FVJ Rating: 5/5 Mar 19, 2017 20:12 Send this review to a friend
Great  Time owned: 6 to 12 months
Collins produced an ad for this receiver. They stated the R-648 was designed with many the 51J-4 design features. Unlike the 51j-4 the R-648 has a tunable RF front end with variable cores like the R-390 series. Using dual RF amplifier tubes and the tuned front-end it is unaffected by powerful shortwave stations and in band strong stations. Like the R-390 the R-648 may be the ultimate AM receiver.
N8FVJ Rating: 5/5 Mar 18, 2017 17:10 Send this review to a friend
Excellent Receiver  Time owned: 3 to 6 months
The Collins R-648 receiver is a Mil Spec built design for the US Air Force in 1956 thru guessing 1960. It has a tunable front-end like the Collins R-390 & R-390A and weighs about 35 lbs.

The receiver is very quiet on the ham bands. 75 meter AM kind of just pops out of the low noise with a strong signal. I can hear most ham AM stations and this is a better receiver than the great performing National NC-183D. Having double conversion, there are no 'ghost' signals on the shortwave bands.

Controls are limited compared to the ham receivers of past. However, the receiver works so well controls such as crystal phasing, Q Multipliers, Noise Limiters, etc are not needed. This receiver has a full time noise limiter and it does not cause any distortion. The RF gain is a screwdriver adjustable control under a spring cover. It is located on the front panel and could be converted to a knob control.

The receivers only used a 28 volt dynamotor supplying 250 volts DC at 100ma. Converting to 120 volts AC power supply requires DC on the tube filaments due to many electrolytic capacitors in the filament circuit. 26 volts AC with convert to 27 volts DC with standard rectifiers and a CRC filter having 2 ohms resistance. 20,000uF per caps makes less than .05 volts AC ripple. B+ is a simple design not needed to be mentioned here.

If you have a chance to buy one, I would spend the $500 to $600. Having 17 tubes, I is a powerful receiver.

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