Well, use a bigger cap then. Personally, I would never run audio
straight to a PC/LT. You never know what will happen. I guess you could
try it and see what happens. I guess replacing a sound card is cheaper
than replacing a motherboard or a PC/LT. Especially if you are using the
onboard sound chip. LoL I always use a 1:1 audio transformer to prevent
ground loops and DC as well. At times I have had to add a 5k oHm pot to
adjust the level - more convenient to quickly turn a knob than messing
with PC/LT sound mixer sliders and a mouse.
BTW, are you using POSAG or something like that? I messed with that kind
of stuff ~15 years or so ago. Boring after a few minutes. Yeah, you'll
see lots of phone #'s and very short messages. Don't remember if it
legal or not but still boring, at least to me anyway. Kinda like the 49
mHz baby monitors and 900 mHz wireless phones. Listening to the
PD/FD/Mil and some local VHF is a lot more interesting at least to me.
Don KPC6NDB
Upland, CA
34.10 -117.63 1250ft
R-75 w/250Hz 2x R-71A w/250Hz R-70
Perseus SDR-IQ FUNcube Dongle Pro+
FRG-100B SR-AF & LPF DSP599zx
MFJ-784B HD-1418 AF-1 MSB-1
PA0RDT Mini-Whip x2 @ 25ft
RYO Active Antenna @ 25ft
LFL1010 ALA100L x2
Post by BigjedOK.A bit of a conflict here then.Question:Would I get away with using
nothing at all?Just a wire from the tapping point to a phono socket
mounted at the rear of the radio.No danger of headphones being plugged
into that.I intend to use the socket for the purpose of decoding pager
signals and the like and want a nice clean signal.
Gerry.
Post by OldOneI normally use a 1K resistor as an isolator incase some one plugs a
32 ohm
Post by OldOneearpiece into the socket and almost shorts the discriminator point to
ground.
Post by OldOneAlso do not use a 0.01 uf cap as DC blocking if you want a clean data
waveform
Post by OldOneout as it will phase distort the low frequency squarewaves output for
data
Post by OldOnedecoding. If you must block the DC use a least a 1.0 uf 50v
monolithic cap
Post by OldOnewhen feeding into a 10k load of the sound card input.
Post by DonPost by DonUsually it is advisable to use a small value ceramic cap like 0.01
uf to
Post by OldOnePost by DonPost by Donblock DC - no resistor needed - that would drop the signal some.
Doesn't hurt to use coax like RG-174 but not really needed. Depends on
how much you want to put into a project labor wise. Also I always
think
Post by OldOnePost by DonPost by Donabout resale value - like putting holes for switches on a front panel.
Thanx Don.I've seen a couple of conflicting articles re this.Some
recommend the resistor with coax,some just a wire from the tapping point
straight to a phono socket on the rear of the radio.I've not seen the
ceramic cap mentioned yet tho'.is that just connected in series,like the
resistor would be?
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