überarbeitet am 22.7.2010
As Rainer Lichte stated in his test report thirty years ago: "The receiver we had in our disposition for testing purposes has been misaligned and in a poor state...", the same happened to me with several Sanyo RP-8880, I could buy on the used market. All three receivers, I could lay hands on, did not operate properly - with contact cleaning, I managed to reactivate the long- and mediumwave ranges...
Most of the switches showed poor contacts, the mechanical stability of the chassis is quite poor so when aktivating one switch, this affected e.g. contact of the bandwidth switch and deteriorated sensitivity. So I would recommend to test a set thoroughly before you spend more then a few Euros on it...
The receiver has a very impressive external appearence with it's metal frontpanel protecting handles, the carrying handle and the rotary ferrite antenna (which cannot be switched off) and the two telescopic antennas. The RP-8880's dimensions are 48 x 24 x 15 cm and it's weight 4,5 kg.
At the left side of the front panel, you find the dial illumination and
main power switch above the large speaker. In a vertical panel at it's right,
you find the switches for the AFC and meter function, the high quality rotary
volume control and the sliding controls for bass and treble which tend to give
poor contact and often need cleaning.
On the left small face of the cabinet, you find the socket for the mains cable and a 12 V DC connector, at the rear face the battery compartment for eight UM-1 batteries, the DIN tape recorder connector and the antenna and earth terminals.
The RP-8880 is a double conversion set in the shortwave ranges, the two standard intermediate frequencies of 10,7 and 455 kHz make the set cheaper as Sanyo could use standard components of Am radios and could make double use of the VHF 10,7 MHz intermediate frequency. Due to this i.f., there is a reception gap between the shortwave bands 2300 - 5950 / 5950 - 6200 / 6200 - 10000 kHz and 11700 - 20000 / 20000 - 30000 kHz. In the longwave / mediumwave / marine band ranges, the RP-8880 acts as single conversion receiver. The crystal calibrator is based on a 4 kHz oscillator with a frequency divider for 1 MHZ, 0,1 MHz and 10 kHz.
The operating scheme in the LW / MW / MB ranges is uncomplicated, but in the
shortwave ranges, the tuning arrangement is really awkward - in the RP-8880,
Sanyo has used a combination of a crystal calibrator with a calibrated VFO used
as fine tuning control:
In summary: The Sanyo RP-8880 with it's quirky tuning arrangement with a
VFO and crystal calibrator is technically outdated from today's point of view,
in can be tuned with acceptable accuracy only in the low frequency segments
of the shortwave spectrum, specially in the spread 49 m shortwave broadcast band.
Frequency stability is poor, as well as skirt selectivity of the ceramic i.f. filters.
The production quality of the receiver has obviously been quie poor and the radio
was not that cheap, so there have been several competing offers of better sets
from other brands - Sanyo never managed to become a large scale manufacturer
of world band shortwave receivers.
e: Chassis disassembly
d: Testbericht RP-8880, Rainer Lichte, Kurzwellenempfänger - Qual der Wahl
© Martin Bösch, 30.12.2010