Improve performance of Your low-band DX-ing station dramatically with this Redifon RFS-11 preselector. Contains a four-stage tuneable bandpass-filter for the complete HF-range, 1 - 32 Mc, in five bands. Easily tuneable. Bandwidth approx. 50 Kc. Most modern HF-rigs contain just too wide front-ends, letting every big unwanted signal thru to the first mixer, thereby seriously impairing overall receiver-performance. Simply insert this preselector in between Your antenna and Receiver, tune to the selected band and there You go - pick-up the smallest DX-signal You otherwise could not have copied. The RFS-11 can both be tuned manually and remotely - for the latter no info available at time of writing.
Speciaal voor Aad staat hier de manual van de RA-1772 ;)
Fuer Friedrich DL6AAR gibt's hier den manual der Harris URR2368