From: Mike Curtis <;wd6e~aiwan.com>;
Date: Fri, 3 Nov 1995 13:15:26 -0800 (PST)
Subject: Re: Wireless/batteries

>; I use a Nady 201 which I cut the male 1/4" and put a female plug on. I then
>; can use any high impedance mic I want with it and run into an amp. I wasn't
>; able to tell the differance between cord or wireless and it has worked fine.

I wouldn't recommend "cutting" the cable. There's a small RF bypass
capacitor at the connector that needs to be reinstalled if you change the
connector. Also, the cable is used as an antenna, and is tuned. Any change
in length can affect radiated signal strengh, perhaps drastically, and may
necessitate transmitter realignment for maximum output.

>; I recommend rechargeable batteries. I use two nine volts a night.

Typical disposable batteries, such as carbon-zinc ("regular" batteries) and
alkaline are 1.5 volts per cell. NiCds are only 1.2 volts at full charge
under load. A 9 volt battery is made up of 6 cells; and most batteries of
that size use 6 cells, ergo most rechargeable "9 volt Nickel Cadmium" (NiCd)
types are 7.2 volts. Also, many are low capacity - I've seen some as low as
40 mAh (e.g. Radio Shack). The Nady Wireless One (what I use) requires 7.0
volts, and 7.2 isn't really sufficient for optimal operation.

The ones I use are 8.4 volts, and 150 mAh. They last all night, and put out
almost identical power to a 9 volt alkaline battery. even though the 8.4
voltage is higher than the typical 7.2 volts, they still recharge just fine
with a standard NiCd charger.

There are 9.6 volt NiCds available, but these require a special charger.

I use one per day - they last me around 6 hours or more. I _try_ to
remember to turn off the transmitter between sets, but I often forget.

It's good to periodically discharge NiCds until the LED on the transmitter
comes on (indicating low voltage). I don't recommend COMPLETELY discharging
them (like leaving them on overnight), as this can reverse charge weak cells
and trash the whole battery. Also observe the recommended charging time for
your charger, and don't leave the battery in the charger much longer than
recommended (i.e. all week, etc.). If it feels warm, it is being damaged
(heat dries out the battery electrolyte) and won't last as long. If you
can't babysit the charger, a timer is helpful - but get one that shuts off
permanently as opposed to one that turns on and off each day.

I carry a spare alkaline, just in case, and occasionally cycle it into other
equipment, keeping a fresh one handy. They have a "shelf life", and are
constantly slow-discharging due to internal resistance. Also, heat
accellerates their demise, so the glove compartment of your car parked in
the sunlight during the summer is not the best place for them.




-- mike


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