![]() We had been discussing the test equipment that we each used for aligning the filters, in particular, the infamous 40MHz Band-Pass filter. ![]() This came about as a result of an email exchange with a fellow RA17 enthusiast. Given that my Systron-Donner didn’t cost me anything back in the early 80s, and the fact that I have recently resolved a frequency accuracy issue, what was my reasoning behind the new investment? The thing is, I already have a more than adequate, albeit old, Systron-Donner 809-1, which covers 10MHz right up to 12.4GHz in 5 switchable ranges. I recently invested in a new spectrum analyser, a Rigol DSA815-TG, to be precise. ![]() A low-cost Hand-Brake lever for Dirt Rally.Using the Rigol DSA815-TG to align filters in the RA17 series.Systron Donner Spectrum Analyzer Type 809-1 - Solving the Frequency Calibration Issue.Repairing a troublesome ProSisTel Rotator.Systron Donner Spectrum Analyzer Type 809-1 re-fit.Repairing a MKII Pye Black Box amplifier.S-Parameter Test Set for the SDR-Kits VNWA.Rapco 1804P9 GPS Disciplined Precision Frequency Source.PLL Upgrade for DB6NT MK2 13cm Transverter.Systron Donner Spectrum Analyzer Type 809-1.A Microphone Pre-Amplifier for the T1154. ![]() Refurbishing a 1940's Air Ministry Headset. ![]()
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