Here is what I did with my BITX40. Installed an 8 pin microphone
jack and use the mic from IC7300. It works good.
Denis, WB8SKP
On 8/6/2018 6:10 AM, Ian Reeve wrote:
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There are available on eBay very neat ready built electret mic
amplifiers,either with automatic gain or a manually adjust
version.I intend to try one of these to boost the audio on
Ssb.Will update once I try it out. 73. M0IDR
Terry,
I went down that same
road and the dynamics I tried had not enough gain.? I ended
up using the stock electret mic but I shorted R63 and
replaced R64 with a 250 ohm resistor in series with a 1 k
pot for a?mic gain control.? ?I got lucky at a hamfest and
picked up a nice Heil headset with no ends for something
like $10, took out the good HC5 element, and mounted the
stock ubitx electret inside.? It works fine, looks good on
the scope, and I have gotten no bad audio reports.? By the
way, the Heil HC5 didn't have enough gain either as I
recall.
Just my mileage.
73,
Pat AA4PG
Terry
You probably can use that 400 ohm dynamic mike with the
BITX, providing you make
the necessary mods to make it compatible with the
microphone amplifier input circuit.?
If your dynamic microphone puts out significantly less
than 45 millivolts you may need
to mod the BITX mike amplifier to have more gain, or less
gain...as necessary.? The
microphone that is provided with the uBITX is proper for
the transceiver, so why not
use it?
Arv
_._
On Sun, Aug 5, 2018 at 7:58 AM
terryhugheskirkcudbright via Groups.Io
<terryhugheskirkcudbright=
[email protected]>
wrote:
Can i use a dynamic mike with 400 ohms measures resistance
with the ubitx or the bitx40
i have not ordered yet - i am trying to make up my mind
which one to buy
terry
