On Aug 6, 2018, at 10:29, Bill Cromwell <wrcromwell@...> wrote:

Hi Walt,

From what I have seen in these threads about spurs, harmonics, and (lack of) filtering the troublesome unintended 'signals' are just about at the legal limit and slightly over. Over is over. Unacceptable. The way I use my radio I think the trash can be sufficiently cleaned up for 'safe', responsible use. It would be much better if that cleanup took place inside the radio and by design. It is too late for that. Later I might do some of my own investigation and attempt to correct the deficiencies. Maybe just follow what somebody else comes up with. But please don't hold your breath. I have other irons in the fire:)

I haven't modded mine at all yet and none of the mods for 'more power' is on my agenda. I like some of the features available in the CEC software. And something *must* be done about that million decibel side tone. OMG. I cracked a shop window with that thing!

I have other gear and will be buying more. Hans Summers's QCX and some other toys from his shop are on my hit list. If uBitx hadn't shown up in my world I would already be using some of those. When I decided to buy the uBitx first it was not a rejection of the QCX:) Those are next.

73,

Bill KU8H

Michigan QRP Club

On 08/06/2018 09:45 AM, WaltR wrote:
Thanks Bill,

I, as many others enjoyed assembling the bitx40 and the ubitx, for my
purposes, dragging around a bag full of outboard filters and other
accessories will not work. Perhaps to some degree I am spoiled by having
access to high end gear, but I am aware that it’s not prudent to compare
a Harris to a ubitx. I wish not to besmirch Harris by putting the ubitx
in the same sentence.

my understanding is the bitx was designed and built as a kit for those
that wish to assemble, experiment, dabble in Arduino sketches etc, and
by the number that have been sold obviously has a large following.
There is a need for a simple solid rig that doesn’t require a lot of
fiddling about, and is reasonably priced and meets regulatory criteria.

There should be some warning or reminder that if you plan on doing any
modifying or hacking that you should ensure that you don’t produce any
transmitted products that may interfere with other services, especially
any that might fall in the spectrum allocated to government agencies and
services, as well as commercial, and international interests. You might
get away with it in the ham bands but you certainly won’t if you cause
superfluous transmissions in other spectrum allocations.

Buy filters, there are some great little devices available at QRP LABS.

Cheers and 73

WRS

IF THE PROCESS IS FLAWED, THE OUTCOME MOST SURELY WILL BE FLAWED

--
bark less - wag more

Thanks Bill,

I, as many others enjoyed assembling the bitx40 and the ubitx, for my
purposes, dragging around a bag full of outboard filters and other
accessories will not work. Perhaps to some degree I am spoiled by having
access to high end gear, but I am aware that it’s not prudent to compare
a Harris to a ubitx. I wish not to besmirch Harris by putting the ubitx
in the same sentence.

my understanding is the bitx was designed and built as a kit for those
that wish to assemble, experiment, dabble in Arduino sketches etc, and
by the number that have been sold obviously has a large following.
There is a need for a simple solid rig that doesn’t require a lot of
fiddling about, and is reasonably priced and meets regulatory criteria.

There should be some warning or reminder that if you plan on doing any
modifying or hacking that you should ensure that you don’t produce any
transmitted products that may interfere with other services, especially
any that might fall in the spectrum allocated to government agencies and
services, as well as commercial, and international interests. You might
get away with it in the ham bands but you certainly won’t if you cause
superfluous transmissions in other spectrum allocations.

Buy filters, there are some great little devices available at QRP LABS.

Cheers and 73

WRS

IF THE PROCESS IS FLAWED, THE OUTCOME MOST SURELY WILL BE FLAWED

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

Get

---

From: [email protected] <[email protected]> on behalf of pat griffin <patgriffin@...>
Sent: Sunday, August 5, 2018 8:42:41 PM
To: [email protected]
Subject: Re: [BITX20] microphone

?

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

Pat Griffin

---

From: [email protected] <[email protected]> on behalf of Arv Evans <arvid.evans@...>
Sent: Sunday, August 5, 2018 11:20:37 AM
To: [email protected]
Subject: Re: [BITX20] microphone

?

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