Thanks for the input abt my question concerning the amp keying =
capacities of the mark V.
Since the manual is not very clear about this subject the mailings I =
received where very usefull.
The mark V can key with the mechanical relays a sb220 (125V at 50 ma) =
since it uses the same mechanical relay as the ft1000mp. Several users =
are using the mkV and sb220/221 combo. In that case I advise you to put =
a 100 to 200 ohm 0.5W current limiting resistor in the SB220/221 keying =
to limit the peak discharge current of the keying circuit (see =
www.vcnet.com/measures ) and to avoid pitting the relay contacts of =
the Mk V.
For qsk keying a modified sb220/221 (circuit AG6K) I have been advised =
a keying inferface either commercial a la Ameritron, Harbarchelectronics =
(look at www.harbachelectronics.com) or home build.
Using the 8 pin band data plug on the mkV (pin 1, 2 and 3 is needed). =
This contact plug or cable can be supplied by Yaesu (P/N D4000019). =
I have simply used a European DIN plug and cut off the not needed pins =
this modified contactplug slides easily in the rear plug of the Mk V.
Using K6XX (see www.k6xx.com) FT1000MP automatic band selection =
interface and keying interface guidelines I build the keying interface =
on a perf board. The band selection interface has not been build.
I have used a 2N3904 as a buffer for the wimpy transistor inside the Mk =
V, the second transistor is a MPSA42 instead of the 2N3904 because the =
MPSA NPN transistor can handle 300V at 500mA. =20
You can use also a IRF 610 mosfet after the buffertransistor. Since I =
have used the MPSA ever since in my QSK modified SB220 for amp fast qsk =
keying with my TS850S it seems very reliable.
By the way I must say that Kenwood transceivers can be easily interfaced =
with all kind of amps than the Yaesu MkV. =20
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