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1-9 of 9 messages
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Icom 735 to Yaesu fl2100b
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by EI2GLB on July 12, 2008
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Hi all
I wish to connect a fl2100b to an Icom 735 can anyone tell me how to do this, there does not seem to be any phono sockets on the back of the amp.
Thanks
Trevor
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RE: Icom 735 to Yaesu fl2100b
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by WB2WIK on July 12, 2008
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The FL-2100B uses high voltage keying and the keying terminals are screw terminals on a terminal strip on the rear of the amplifier.
For use with the IC-735, you'll need an interface between the rig and the amplifier to prevent damage to the Icom.
WB2WIK/6
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RE: Icom 735 to Yaesu fl2100b
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by KA9CCH on July 12, 2008
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A foot switch to key the amp and xcvr will work also. See :http://heilsound.com/amateur/products/footswitch/index.htm
Made for that purpose.
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RE: Icom 735 to Yaesu fl2100b
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by W5RKL on July 17, 2008
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The IC-735's internal switching relay, accessed
through the 735's rear panel's "SEND" socket, has
a maximum voltage rating of 24VDC.
The FL-2100B's internal T/R relay operates on a low
voltage of "12VDC at approximately 100ma" not high
a voltage. This is well within the IC-735's relay
maximum rating.
I recommend reviewing both the IC-735 and the
FL-2100B's manual in order to ensure you fully
understand how to connect the FL-2100B to the
IC-735.
If you do not have the manuals for either the
IC-735 or the FL-2100B, you can download both
manuals in pdf format, free, at the following
websites.
The FL-2100B operators manual:
www.qsl.net/n2ckh/LIBRARY/YAESU/FL-2100B/FL-2100B.pdf
The IC-735 operators manual:
www.n7tgb.net/pages/radio/icom_docs.htm
73
Mike
W5RKL
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RE: Icom 735 to Yaesu fl2100b
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by W5RKL on July 17, 2008
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You can verify the FL-2100B's internal relay voltage
by measuring the voltage on the FL-2100B's rear
terminal pins "RY" and "E". If there is a jumper
between "RY" and "E" pins on the rear terminal,
the jumper must be removed. You should measure
approximately 12VDC between terminal pins "RY" and
"E". To measure the relay's energized current, simply
use the same voltage meter but switch the meter leads
to measure current, placing the positive lead on "RY"
and the negative lead on "E". In either case the
front panel "STBY/OPER switch must be in OPER position.
The FL-2100B's T/R relay will energize with the
current meter placed across the terminal pins "RY"
and "E" with the STBY/OPER switch in OPER postion.
The relay will not energize when measuring the voltage
between pins "RY" and "E" with the front panel
STBY/OPER switch in OPER position.
73
Mike
W5RKL
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RE: Icom 735 to Yaesu fl2100b
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by WB2WIK on July 17, 2008
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>RE: Icom 735 to Yaesu fl2100b Reply
by W5RKL on July 17, 2008 Mail this to a friend!
The IC-735's internal switching relay, accessed
through the 735's rear panel's "SEND" socket, has
a maximum voltage rating of 24VDC.
The FL-2100B's internal T/R relay operates on a low
voltage of "12VDC at approximately 100ma" not high
a voltage. This is well within the IC-735's relay
maximum rating.<
::That's the risk of looking at schematics and parts lists on line, instead of having the amplifier to measure. Yes, RL1 in the FL-2100B is a 12V relay: That's about the applied voltage when the relay is *keyed* and the RY to E contacts are closed. (In reality, almost 18Vdc is applied and this is one of the failures of the design.)
But "key up" (not "key down") represents the voltage the keying relay in the IC-735 is exposed to. Key down, when the amp is keyed, the voltage at "RY" is zero, since it's tied to ground.
"Key up" when the relay is *not* closed, the actual voltage measures 20Vdc, typically. That's because it is derived from T1 which provides 13.65Vrms no load to DS1, a 1/2-wave rectifier, filtered by C5 (1000uF at 25V). However, the original design assumes operation on a 117Vrms or 234Vrms line, which are the only taps available on T1.
In my case, my line voltage is 244V -- pretty much always, and that's well within tolerance for the American power grid (unlike Japan, where it's 200V by design). So, using "American line current" all voltages come out about 5% high.
In my test FL-2100B, the DC voltage (open circuit) from RY to ground measures 20.9Vdc.
That's not 12V.
Now, when you close the contacts, the voltage across RL1's coil is lower because the voltage drop across DS1 increases, and C5 is not large enough to hold the DC voltage very high under load. So, the coil voltage measures about 18V.
But, it's worse than that. When RY1 releases and the coil field collapses, the kickback surge voltage measures ~48Vpk (scope measurement). *That's* what tends to blow out the keying relay in the IC-735.
But I'd use an interface between the IC-735 and the FL-2100B, or at minimum modify the FL-2100B in at least this way:
-Add a kickback protection diode across RY1's coil to prevent the big spike.
The FL-2100B is not a great design. It's really tapped for the Japanese market; the bias circuit is weak and prone to failure; the little cooling fans don't blow any air across the socket pins. It's kind of a knockoff of the Heath SB-200, but Heath did a better job.
WB2WIK/6
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RE: Icom 735 to Yaesu fl2100b
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by W5RKL on July 18, 2008
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I don't doubt the voltage you measured was higher.
I also agree the unkeyed voltage level is what is
important. I key my AL-811 with my FT-857D which
has a 12VDC relay keying voltage. The measured relay
voltage is between 14 and 15 VDC unkeyed. The 857D
keys the amplifier's T/R relay just fine without a
keying interface. But, again, as you say and I
agree, the unkeyed voltage is the important one.
The FL-2100B has a number of different transformer
primary voltage settings, 100, 110, and 117VAC plus
200, 220, and 240VAC. One could plug the FL-2100B
into a variac transformer and bring the line voltage
down to the level the primary wiring is set for then
measure the relay voltage to see what the voltage is.
I seem to recall when I had an FL-2100B, it was wired
for 117VAC, I measured 15VDC on the relay. Now that's
been a few years back so I could be off a few volts.
Anyway, thanks for the info Steven and have a good
day.
73
Mike
W5RKL
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RE: Icom 735 to Yaesu fl2100b
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by W5RKL on July 18, 2008
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Oppps forgot about the relay coil issue. Yes, that's
true. I'm surprised Yaesu never thought of that and
put a diode across the relay coil to prevent that.
The same thing occurs in power supplies with choke
input filters when rectifier tubes are replaced with
diodes that are not properly protected against the
collapsing field. I have an old Yaesu FT-757GX and
the optional amplifier relay keyer, forgot the part
number, has a diode across the relay for that exact
purpose to protect the keying transistor. I duplicated
the circuit and it works very well.
73
Mike
W5RKL
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RE: Icom 735 to Yaesu fl2100b
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by AE6JX on August 7, 2008
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From my memory, which may be flawed, the 2100 has the -ve receive grid bias on the keying terminal, about -20 to -30 volts. It is best to key this through an isolated interface. I built one into my 2100, using the bias tap on the transformer to create a 20V power supply.
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