>
>Hi all,
>
>I would like to create the right relay time sequencing into my two holer amp.
>Using for input and output Jennings RJ1A (operating time 8ms, release time
>8ms) and for bias switching SDS-S2 Relay (op 8ms, release 5ms). In to the
>input relay circuit I put a RC string 12R/1W and 100µF/50V. These should give
>me a small delay of abt. >1ms. Is that right, that all modern transceivers
>have a build in delay of about 10ms? Will say, after VOX starting or PTT
>activation h.f. power will come 10ms later. I am interested to know delay
>times for Icom 781, FT-1000D, FT-990, TS-870S and TS-850S.
>Thaks,
>
? Werner - - Delaying transceiver output until relays close in the
amplifier is a problematic thing to accomplish. An easier solution to
the problem is to speed-up relay closure in the amplifier, so that the
contacts close before the fastest radio on the market can begin to
generate RF. // Jennings RJ-1A relays can be made to close in <2mS.
The fastest radio is c. 5mS. (FT-1000D). For a make speed-up circuit,
see Figure 7 on my Web site. // Basically, a make speed-up circuit
overcomes the coil inductance (in this case, c. 0.3H) sooner with a
V-limited current source. .Speed up on break is accomplished by putting
a resistance in series with the reverse diode across the relay's coil.
>
- cheers
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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