⚓ Description

Fixed frequency receiver with crystal for channel selection.

⚓ Specs

• 2-30MHz, crystal controlled
• AM, USB, LSB, RTTY (wide and narrow), CW
• 115/230V or 14-18V

⚓ Documentation

• Bought a brochure with some specs and a block diagram, waiting to receive and put to Archive.org
• Service Manual available to buy from http://www.vintagemanuals.com/manual/WRL+Galaxy/R-1735URR%2C+FFR-230 (I can confirm it is very good quality, includes alignment procedure, and all schematics and components values)

⚓ Crystal frequency

There is two crystals in a controlled oven.

• x1 is the “channel” crystal
• x2 is 1703.226 KHz
• There is a 53 KHz IF

Crystal frequency calculation:
${rx\ frequency} = {x1 + x2 - if}$

So for the x1 channel crystal frequency:
${x1} = {frequency - (1703.226 - 53)}$

Examples:

• Rx on 11.726MHz = 10.075774MHz x1 xtal
• Rx on 9.970MHz = 8.319774MHz x1 xtal

⚓ Pictures

⚓ Work

⚓ 22/04/2022

• Working, tests done in AM with a siggen instead of crystal.
• Some wires have been cut/desoldered ? Waiting for service manual to see.
• Horrible blue led to be replaced.

⚓ 24/04/2022

• Disassembled the whole front panel for cleaning
• Speaker is pierced at one place, will be replaced with a GF0776M from CUI Devices
• The additional circuit (replacing selectivity ?) was half-wired, and needs to be reverse engineered
• The plate behind the transparent dial of the preselector is white-yellowish and cracked, will probably strip and paint with plain mate white
• The transparent front window of the preselector needs to be cleaned and re-fixed