My avionics collection.
The combination of flying and Radio amateur
results in a collection of communication avionics.
RA-1B Bendix HF RX R1155/T1154 ARC-2 VHF TRX
618M-1 VHF com Collins British VHF TRX SARAM
ART-13 Collins ER-104 thomson AVC-110 RCA
GF11 HF TX GF11
Solving the earth problem of the R1155 - T1154
When connecting the minus of the HV supply to more equipment simultanously and connecting the T1154 earth terminal to earth of the other transmitters/ receivers in the shack, generates a short cut to the negative grid bias circuit of the R1155.
To overcome this problem so you can use only one powersupply for all equipment i made this capacitor which makes a DC block between the earth terminal of the T1154 and the rest of the shack. It works well. the capacitors have to whitstand a voltage of 30...40 VDC and the RF current due to transmission. See pictures below. The chassis of the R1155-T1154 is app. 35 VDC below the rest of your equipment. Use 16 1nF feed thru capacitors made by Stettner &Co.