| |
G8MNY > TECH 24.04.01 00:37l 25 Lines 1065 Bytes #-8827 (0) @ WW
BID : 44812_GB7CIP
Read: DK1MBY GUEST OE7FMI
Subj: SYSTRON DONNER 1702 SIG Gen.
Path: DB0ZKA<DB0GPP<DB0LX<DB0RBS<DB0ROT<DB0AIS<DB0ZDF<DB0LJ<DB0ACH<DB0OVN<
DB0GOS<ON6AR<WB0TAX<HA3PG<HA8FY<ON1CED<ON0CK<GB7SXE<GB7CIP
Sent: 010423/2042Z @:GB7CIP.#32.GBR.EU #:44812 [Caterham] #:306956 $:44812_GB7C
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WWW
Hi & thanks for reading.
I bought one of these at the Leicester rally a few years ago. It is 19"
rack sized & generates signal from 100Hz-999.9999MHz with 8 lever operated
thumb wheels. Made in the USA by the Throrn EMI owned Co. in 1983?
It uses sevearal PLL oscillators & mixers, all locked to an internal/external
reference. It has a calibrated AM & FM modulation (digital readout) display
from built in locked 400Hz & 1KHz sine wave sources ass well as expernal mod.
Unfortunatly it was not all working (eg no 144MHz) when I got it, but I have
now managed to repair all the faulty bits I think, without a diagram! Which was
very time consuming, working out how it all worked.
I have done several mods now. eg FM deviation increased to 100KHz, & a "poor
mans Ceasium ref" (simular to BATC/Radcom) where I have phase locked the 1MHz
master crystal oscillator to BBC terrestial TV line syncs to give better than
1 in 10^8 accuacy.
I would appreciate any infomation on the unit.
73 de John, G8MNY @ GB7CIP
Read previous mail | Read next mail
| |
