Good idea! One of those little max9814 could be put in many mic housings using the +5v! tim ab0wr On Fri, 01 Jun 2018 09:26:57 -0700 "Lee" <mr.olson@...> wrote: I put +5 on the unused pin.? If you want to put a preamp or speech
processor in a mic the power is there if needed. --
Lee - N9LO?"I Void Warranties"
|
Everyone has different needs. I personally like the bandwidth as it stands. On 80m nets in a crowded band, the narrow bandwidth is a big help in isolating net members from others only 2khz away. I know others say my audio sounds "constricted" on transmit but it's not a lot different than what many DX'ers use for maximum "punch" in a pile up, again a big help on a net frequency on a crowded 80m band. tim ab0wr On Fri, 1 Jun 2018 13:07:34 -0400 "Ralph Mowery" <rmowery42@...> wrote: The filter on my ubitx seems narrow. By feeding in a 1000 hz signal
into the mic input and measuring the power output and then going up
and down in the audio frequency I seem to have about a 1650 hz to the
3 db down in output power. Only about 1800 hz or less and the power
out drops 10 db or more.
I though by now someone may have tried to broaden the filter. I have
not had time to,but hope to lower the capacitors in the filter some
to see if it helps.
The small electric microphones seem not to be all that good either
from several I tried. I switched to a Shure amplified mic and get
much better audio reports from several I talk to on an 80 meter
sched. I do feed it through an amplifier for about 150 watts to
bring the signal up to what they are used to hearing me at.
de ku4pt
On Fri, Jun 1, 2018 at 12:21 PM, Lee <mr.olson@...> wrote:
Thank you all. I like Jazz. On my mp3 player I have a 3 piece
band. Drums, bass, and piano. The drummer is playing on the snare
with brushes. I plug my SSB-Mite in it and it sounds good. When I
flip the bypass switch to filter the drummer on the snare and the
bass disappear but the piano still sounds good. . When I tried it
in my uBitx it sounded better in bypass than in filter mode. Now
I know why. I can use it on other non-filtered radios.
--
Lee - N9LO *"I Void Warranties"*
_._,_._,
|
Yes..!!
I had been juggling around that one. Stock 12MHz xtals have an Lm around 17mH and appeared bit narrow with 100pf caps, I was not happy with the round number IF's in uBitx tried some micro controller 11.0592 ones all in HC49S package now they were way too off with Lm at 24.5nH decent bandwidth was predicted by Dishal with 56pf caps and a sweep on SNA looked very decent but since Dishal does not considers actual? Q of xtals the smoother we make the pass band the worse is the skirt of filter. Farhan often mentioned this so still working around that one to arrive at a compromise.
Rahul VU3WJM
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Thanks guys.?? Guess I'll ground it and see what happens.? I'll put a pic up when done.
David - KD0UYH
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Re: New VK4PLN Audio Daughter Board + BCI
The PGA-103 is nice utility amp but too much gain for uBitx.? It needs more like a grounded gate Jfet
(10db is enough).? A wideband high gain without band limiting(tuned) will cause all sorts of havoc.
Allison
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Re: boosting the power on 28 MHz
#ubitx
I use the best tool I have for spotting 10 and 6M activity.
My radios.? There is always one on 10M and 6M turned on.
The advantage of building monoband radios they are opimized for the band and?
I have one for each of my favorite bands.? That and it leaves my mainline radios open
(tentec Eagle for HF and Tentec 6n2 for 6m and 2m).?
That Au and Eskip event didn't make it here, not yet.
Allison
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Re: Power supply question
Assuming there is nothing wrong with the rigs the excess current the supply can put out will not be used and you are safe.??
It is just like in your house, the AC outlet can put out lots of current,but each device will only take what is needed as long as the voltage is in the required range.
I often run my ubitx off a 50 amp Astron supply.
de ku4pt
On Fri, Jun 1, 2018 at 12:47 PM, <n2tmc@...> wrote: I have a 13.8 volt 20 amp supply I use on my 2 meter rigs. It has multiple connections for power out. Will my BITX40 only use the amps it needs or am I going to blow it up? I am sorry if this is a dumb question but since my stroke my memory isn't always that great.
TNX
George
N2TMC
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Re: Power supply question
Bill, that is a great answer!
Al
toggle quoted message
Show quoted text
On Jun 1, 2018, at 12:56 PM, Bill Cromwell <wrcromwell@...> wrote:
Hi George,
If you don't know (remember) and you ask a question then it isn't a dumb question :)
Your power supply does not 'force' 20 amps. It tries to 'force' 13.8 volts and it will until it gets to somewhere around 20 Amps *if* the load (your radio) demands. So the short answer is that your radio will only take the current it needs as long as it is not more than that 20 Amps the power supply can deliver. Your 20 Amp supply will be loafing along powering your happy ubitx.
On 06/01/2018 12:47 PM, n2tmc@... wrote:
I have a 13.8 volt 20 amp supply I use on my 2 meter rigs. It has
multiple connections for power out. Will my BITX40 only use the amps it
needs or am I going to blow it up? I am sorry if this is a dumb question
but since my stroke my memory isn't always that great.
TNX
George
N2TMC --
bark less - wag more
|
Re: Power supply question
I have a tendency to over fuse. One on the hot one on the ground. Will the BITX40 be happy with 13.8 volts?
|
The filter on my ubitx seems narrow.? By feeding in a 1000 hz signal into the mic input and measuring the power output and then going up and down in the audio frequency I seem to have about a 1650 hz to the 3 db down in output power.? Only about 1800 hz or less? and the power out drops 10 db or more.
I though by now someone may have tried to broaden the filter.? I have not had time to,but hope to lower the capacitors in the filter some to see if it helps.
The small electric microphones seem not to be all that good either from several I tried.? I switched to a Shure amplified mic and get much better audio reports from several I talk to on an 80 meter sched.? I do feed it through an amplifier for about 150 watts to bring the signal up to what they are used to hearing me at.
de ku4pt ?
On Fri, Jun 1, 2018 at 12:21 PM, Lee <mr.olson@...> wrote: Thank you all.?? I like Jazz.? On my mp3 player I have a 3 piece band.? Drums, bass, and piano.? The drummer is playing on the snare with brushes.? I plug my SSB-Mite in it and it sounds good.? When I flip the bypass switch to filter the drummer on the snare and the bass disappear but the piano still sounds good.? .? When I tried it in my uBitx it sounded better in bypass than in filter mode.?? Now I know why.? I can use it on other non-filtered radios.
--
Lee - N9LO? "I Void Warranties"
?
_._,_._,
|
Re: boosting the power on 28 MHz
#ubitx
Yeah, and now we're also getting Aurora on top of it. Now that's why 10 and 6 are called the "magic bands"!  73 Allard PE1NWL
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Re: Power supply question
Hi George,
If you don't know (remember) and you ask a question then it isn't a dumb question :)
Your power supply does not 'force' 20 amps. It tries to 'force' 13.8 volts and it will until it gets to somewhere around 20 Amps *if* the load (your radio) demands. So the short answer is that your radio will only take the current it needs as long as it is not more than that 20 Amps the power supply can deliver. Your 20 Amp supply will be loafing along powering your happy ubitx.
toggle quoted message
Show quoted text
On 06/01/2018 12:47 PM, n2tmc@... wrote: I have a 13.8 volt 20 amp supply I use on my 2 meter rigs. It has
multiple connections for power out. Will my BITX40 only use the amps it
needs or am I going to blow it up? I am sorry if this is a dumb question
but since my stroke my memory isn't always that great.
TNX
George
N2TMC
--
bark less - wag more
|
Re: Power supply question
Should work fine.
I'd add a 3 Amp fuse inline on the +12v from power supply? to Bitx40
to keep explosions down to a minimum.
Jerry
toggle quoted message
Show quoted text
On Fri, Jun 1, 2018 at 09:47 am, <n2tmc@...> wrote:
I have a 13.8 volt 20 amp supply I use on my 2 meter rigs. It has multiple connections for power out. Will my BITX40 only use the amps it needs or am I going to blow it up? I am sorry if this is a dumb question but since my stroke my memory isn't always that great.
|
Re: Power supply question
Your powersupply will only supply the amount of current the radio needs.
So for your powersupply , you will have no problem and it will only be loaded with a few amps , depending if your in rx or tx mode.
Joe VE1BWV
On Fri, Jun 1, 2018, 1:47 PM < n2tmc@...> wrote: I have a 13.8 volt 20 amp supply I use on my 2 meter rigs. It has multiple connections for power out. Will my BITX40 only use the amps it needs or am I going to blow it up? I am sorry if this is a dumb question but since my stroke my memory isn't always that great.
TNX
George
N2TMC
|
I have a 13.8 volt 20 amp supply I use on my 2 meter rigs. It has multiple connections for power out. Will my BITX40 only use the amps it needs or am I going to blow it up? I am sorry if this is a dumb question but since my stroke my memory isn't always that great.
TNX
George
N2TMC
|
I have several mics with goosenecks. On all of them the shield is connected to the mic base body. Since the gooseneck is metal like the base, it's connected to the shield as well.
That said, on at least one of my mics (perhaps more) the shield for the mic is not connected to the shield coming into the base from the radio. In fact my Kenwood TS-430 will produce a hum on my audio if the mic ground is connected to the radio ground. You don't have to worry about that on a Bitx series radio tho.
Vince.
toggle quoted message
Show quoted text
On 06/01/2018 10:53 AM, davedt1e@... wrote: I'm going to use this old light stand to make a desktop mic. Should I
attach the ground side to the flexible conduit portion? I'm worried
about hand capacitance issues.
Thanks!
--
Michigan VHF Corp.
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I don't think it is strictly necessary
Il 01/giu/2018 16:54, < davedt1e@...> ha scritto: I'm going to use this old light stand to make a desktop mic.? Should I attach the ground side to the flexible conduit portion?? I'm worried about hand capacitance issues.
Thanks!
|
I put +5 on the unused pin.? If you want to put a preamp or speech processor in a mic the power is there if needed. -- Lee - N9LO? "I Void Warranties"
?
|
Grounding can't hurt.?? Please post a picture of it when finished. -- Lee - N9LO? "I Void Warranties"
?
|
Thank you all.?? I like Jazz.? On my mp3 player I have a 3 piece band.? Drums, bass, and piano.? The drummer is playing on the snare with brushes.? I plug my SSB-Mite in it and it sounds good.? When I flip the bypass switch to filter the drummer on the snare and the bass disappear but the piano still sounds good.? .? When I tried it in my uBitx it sounded better in bypass than in filter mode.?? Now I know why.? I can use it on other non-filtered radios. -- Lee - N9LO? "I Void Warranties"
?
|
Allard PE1NWL
Lee