Re: looking for a ubitx board
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The 4sqrp filter is probably an audio filter like the 200hz very nice cw filter from them I assembled some time ago. The one in the Ubitx is the several poles 2nd IF crystal filter.
Il 01/giu/2018 16:03, "Lee" < mr.olson@...> ha scritto: So we already have a filter to cut audio outside the 700-2800 range?? I was building a SSB-Mite from 4 State QRP Group.? I searched the messages for it and did not find anything.?? Can you tell us where in the uBitx schematic it is.? Curious to compare it to the SSB-Mite.?
--
Lee - N9LO? "I Void Warranties"
?
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Exactly, it's its stock crystal filter at the second IF. Depending on how the BFO was set. If the carrier is closer to the filter bandwidth you will have more basses and less high and less sideband rejection. I see it works like that on mine without any mod. (the only change I have done so far is reducing R63 to 24ohm to have more average power). 73 Franco
Il 01/giu/2018 16:47, "Tim Gorman" < tgorman2@...> ha scritto: It's the 12Mhz SSB filter that limits the audio bandwidth.
tim ab0wr
On Fri, 01 Jun 2018 07:03:01 -0700
"Lee" <mr.olson@...> wrote:
> So we already have a filter to cut audio outside the 700-2800 range?
> I was building a SSB-Mite from 4 State QRP Group.? I searched the
> messages for it and did not find anything.?? Can you tell us where in
> the uBitx schematic it is.? Curious to compare it to the SSB-Mite. --
> Lee - N9LO?"I Void Warranties"
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Re: New VK4PLN Audio Daughter Board + BCI
Thru holes
?
?
Dr. William J. Schmidt - K9HZ
?
From: [email protected] [mailto:[email protected]] On Behalf Of Nick VK4PLN
Sent: Thursday, May 31, 2018 12:13 AM
To: [email protected]
Subject: Re: [BITX20] New VK4PLN Audio Daughter Board + BCI
?
Hi.
I'm thinking I'll make the board so it reaches all the way to the LPF relays.
One end is supported by the connector and then you can just glue a couple of 12mm stand offs on the first and last relay for the board to screw to.
Ill leaver the extra area blank for prototyping...
What would be best in the area? Me-Squares? or Through holes?
Thanks for the feedback.
73, Nick VK4PLN
?
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Re: New VK4PLN Audio Daughter Board + BCI
Hey what about a preamp for 6-15 meters?? I have a nice design for one using a PGA-103+ ¡ only 12 parts if you include the bypass relay¡ ? ?
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Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Nick VK4PLN
Sent: Wednesday, May 30, 2018 8:05 PM
To: [email protected]
Subject: [BITX20] New VK4PLN Audio Daughter Board + BCI ? Hi Everyone.
I am working on a new board that will give a few extra features to stock uBitx.
Its an Audio board providing easy access to Audio I/O pins. (add in your own AGC board, External amplifier...)
A place for an SSM2167 Mic Pre-amp. (with filtering for feedback and shutdown on TX)
Simple 4 component PTT POP fix. (BS170)
Switchable 200hz CW filter. (LM324)
and a bonus Snap off section with a 3.5MHZ BCI filter for the RX chain.
Here is a pre-view, NOTE this is a WORK-IN-PROGRESS.
Suggestions and corrections welcome.
73 Nick VK4PLN
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Hi Curt,
When those four-pin mic connectors were in vogue there was a recommendation by some manufacturers to use the fourth pin as PTT ground. Both the mic ground pin and the PTT ground pin are grounded..even right next to each other. I don't recall just why nor what problem that resolved. Possibly something to do with a ground loop. If your mic cable has only three wires (or two wires and a braid) you obviously cannot do that. If it has four conductors (one being a braid) use all four with the mic ground being the braid. It may not make any difference at all.
73,
Bill KU8H
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On 06/01/2018 10:30 AM, Curt M. wrote: Hi guys, I'm going to build up my uBitx and use a standard 4 pin mic
jack. For some reason I'm not used to seeing the circuit drawing of the
jack in the Wire Up so this is my interpretation.
I just want to make sure that I have this correct.
Violet = Mic +
Blue = Mic GND
Orange = PTT
Shorting between Orange and Blue will trigger PTT. Is that correct?
Thanks,
Curt
--
bark less - wag more
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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!
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It's the 12Mhz SSB filter that limits the audio bandwidth. tim ab0wr On Fri, 01 Jun 2018 07:03:01 -0700 "Lee" <mr.olson@...> wrote: So we already have a filter to cut audio outside the 700-2800 range?
I was building a SSB-Mite from 4 State QRP Group.? I searched the
messages for it and did not find anything.?? Can you tell us where in
the uBitx schematic it is.? Curious to compare it to the SSB-Mite. --
Lee - N9LO?"I Void Warranties"
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"?Unless you are keen to help diagnose these problems, best to just?
sit on your hands?till Allison and others report back."? ?Just what I plan on doing. But, it is fun to watch you and Allison weave your voodoo magic on this!? ?:)
Dave
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Re: Teensy I2c on wire2 (SDA2/SCL2)
#ubitx
There is a separate library for Teensy (i2c_t3) that comes as a built in library in the Teensy add-on for the IDE.
It is supposed to handle Wire1, Wire2, Wire3, and Wire4
#include <i2C_t3.h> instead of #include <Wire.h>
But apparently the LCD library may only be able to access Wire1
N5IB
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Re: boosting the power on 28 MHz
#ubitx
Oh wow. Allard I didn¡¯t know you were the creator, It¡¯s a good service. Btw just got notice that there¡¯s some Sporadic E on 6meters right now if anyone wants to have a go at it lol.
Joe
KD2NFC
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On Jun 1, 2018, at 10:25 AM, Allard PE1NWL <pe1nwl@...> wrote:
Great to hear this Joe! I never expected it would grow this big when I
started the DXrobot in the summer of 1999.
73 Allard PE1NWL
On Fri, June 1, 2018 16:06, Joe Puma wrote:
Allard I use this service DXRobot. I get audio alerts on a simplex node I
use that gives me propagation alerts. I get alerts everyday when 6m is
open
Joe
KD2NFC
On Jun 1, 2018, at 4:11 AM, Allard PE1NWL <pe1nwl@...> wrote:
For 6m (and up) you can use the DXrobot to monitor the band condition
and
to efficiently work DX:
Band status alerts are also sent via Twitter:
And if you have an Android device you can use this free alerting app:
73 Allard PE1NWL
On Fri, June 1, 2018 08:36, iz oos wrote:
Maybe in Europe works a little bit better. In May and June we know
bands may be open and some people try to call. Also are very important the
beacons. TEP is another story as I found it open in February to South
Africa and no beacon can help. Dxmaps Site may help with its e-sporadic
clouds maps but these are theoretical values based on actual qsos and if
no
one calls no e-cloud can be mapped. SELFSPOTTING in these cases should not
be blamed.
Il 01/giu/2018 03:45, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
6M has been the magic band for many decades before me. ;)
As a hard core VHF/UHF op I spend a lot of time on 6M. How hard core? My first three HB radios were for 6, they remain in service since. 6M
is
not high power, its good antennas, yagis and they are not hard to
build.
The entry level is horizontal 3 elements on a 6ft boom and a few
watts.
10M is a second favorite. Its open more than closed. The problem is
everyone
is listening, no talking. End of last cycle I got tired of hearing
"10 is
dead" so with a
tribander, end fed halfwave wire and qrp power [4W SSB] I worked 85
countries in
5 months. There was TEP and Eskip enough that it included spots like
MacMurdo
and the Falklands from W1 land. Then a living got in the way... ;) I
hear its dead from many, they all answer the question, When did you
call
CQ there?",
they didn't. If no one is talking someone has to make the first
noise.
Generally true
most bands but generally 10 and 15 (and 17) will be daylite bands for
a
while and
occasional night skip. Oh, and 6M is entering the E-skip season
(least
here in USA)
and EU too and that happens any time for a few minutes or hours. The
only
way
to know is to be there.
Allison
|
Hi guys, I'm going to build up my uBitx and use a standard 4 pin mic jack. ?For some reason I'm not used to seeing the circuit drawing of the jack in the Wire Up so this is my interpretation.
I just want to make sure that I have this correct.
Violet = Mic +
Blue = Mic GND
Orange = PTT
Shorting between Orange and Blue will trigger PTT. ?Is that correct?
Thanks,
Curt
|
Re: uBITX -Regarding the PA transistor heatsinks.
I was lucky in the box I put my uBITX in was just large enough to fit the display out? a hole in the front and the heat sinks out the back.? When I changed the final transistors the tab was at ground.? Then I bought a large heat sink and fastened it to the box and bolted the transistors to it.? That gave me a heat sink about 3 inches tall and 4 inches long with some vertical fins.
On Fri, Jun 1, 2018 at 3:31 AM, Peter LB0K <lb0k@...> wrote: ?
I can see the insulation argument to why these are installed hanging on to the IRF510s but this puts a large mechanical load on the transistor legs and increases the risks of damage especially if one tried to use the uBITX as a portable, even as a SOTA rig.
?
One could fit a larger heatsink that was fixed to the chassis/casing or PCB and one would then have to add rectangular insulating washers between the transistors and the heatsink.
These changes would increase the parallel drain(s) capacitance to ground
?
What sort of negative results should/could one expect from these measures?
?And could one fix'em?
?
I envisage these positive results:-
-?????? better mechanical strength
-?????? easier to provide controlled cooling of the heatsink.
-?????? a slight increase of weight
?
Someone has suggested use of? very beefy 6400BG heatsink, this has two solderable pins installed in the one end of the profile. However the uBITX board has no room for these.
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Re: boosting the power on 28 MHz
#ubitx
Great to hear this Joe! I never expected it would grow this big when I
started the DXrobot in the summer of 1999.
73 Allard PE1NWL
toggle quoted message
Show quoted text
On Fri, June 1, 2018 16:06, Joe Puma wrote: Allard I use this service DXRobot. I get audio alerts on a simplex node I
use that gives me propagation alerts. I get alerts everyday when 6m is
open
Joe
KD2NFC
On Jun 1, 2018, at 4:11 AM, Allard PE1NWL <pe1nwl@...> wrote:
For 6m (and up) you can use the DXrobot to monitor the band condition
and
to efficiently work DX:
Band status alerts are also sent via Twitter:
And if you have an Android device you can use this free alerting app:
73 Allard PE1NWL
On Fri, June 1, 2018 08:36, iz oos wrote:
Maybe in Europe works a little bit better. In May and June we know
bands may be open and some people try to call. Also are very important the
beacons. TEP is another story as I found it open in February to South
Africa and no beacon can help. Dxmaps Site may help with its e-sporadic
clouds maps but these are theoretical values based on actual qsos and if
no
one calls no e-cloud can be mapped. SELFSPOTTING in these cases should not
be blamed.
Il 01/giu/2018 03:45, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
6M has been the magic band for many decades before me. ;)
As a hard core VHF/UHF op I spend a lot of time on 6M. How hard core? My first three HB radios were for 6, they remain in service since. 6M
is
not high power, its good antennas, yagis and they are not hard to
build.
The entry level is horizontal 3 elements on a 6ft boom and a few
watts.
10M is a second favorite. Its open more than closed. The problem is
everyone
is listening, no talking. End of last cycle I got tired of hearing
"10 is
dead" so with a
tribander, end fed halfwave wire and qrp power [4W SSB] I worked 85
countries in
5 months. There was TEP and Eskip enough that it included spots like
MacMurdo
and the Falklands from W1 land. Then a living got in the way... ;) I
hear its dead from many, they all answer the question, When did you
call
CQ there?",
they didn't. If no one is talking someone has to make the first
noise.
Generally true
most bands but generally 10 and 15 (and 17) will be daylite bands for
a
while and
occasional night skip. Oh, and 6M is entering the E-skip season
(least
here in USA)
and EU too and that happens any time for a few minutes or hours. The
only
way
to know is to be there.
Allison
|
Hi all,
?
I have an unopened/unmodified BiTX-40 for sale, purchased on January 25, 2017. ?I'm just not getting enough time for projects - as is obvious between the purchase date and now! - so it's better to get it into other hands. ?It even has the original India Post cardboard box!
? Price = $55 including shipping?by Paypal. ?I will ship by priority mail to the US address you provide. Shipment outside US would need to be discussed. ?Please contact me at W1PJE at arrl.net for the Paypal address and other details.
73,
Phil W1PJE
|
Re: boosting the power on 28 MHz
#ubitx
Allard I use this service DXRobot. I get audio alerts on a simplex node I use that gives me propagation alerts. I get alerts everyday when 6m is open
Joe
KD2NFC
toggle quoted message
Show quoted text
On Jun 1, 2018, at 4:11 AM, Allard PE1NWL <pe1nwl@...> wrote:
For 6m (and up) you can use the DXrobot to monitor the band condition and
to efficiently work DX:
Band status alerts are also sent via Twitter:
And if you have an Android device you can use this free alerting app:
73 Allard PE1NWL
On Fri, June 1, 2018 08:36, iz oos wrote:
Maybe in Europe works a little bit better. In May and June we know bands may be open and some people try to call. Also are very important the
beacons. TEP is another story as I found it open in February to South
Africa and no beacon can help. Dxmaps Site may help with its e-sporadic
clouds maps but these are theoretical values based on actual qsos and if
no
one calls no e-cloud can be mapped. SELFSPOTTING in these cases should not
be blamed.
Il 01/giu/2018 03:45, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
6M has been the magic band for many decades before me. ;)
As a hard core VHF/UHF op I spend a lot of time on 6M. How hard core? My first three HB radios were for 6, they remain in service since. 6M
is
not high power, its good antennas, yagis and they are not hard to
build.
The entry level is horizontal 3 elements on a 6ft boom and a few watts.
10M is a second favorite. Its open more than closed. The problem is
everyone
is listening, no talking. End of last cycle I got tired of hearing "10 is
dead" so with a
tribander, end fed halfwave wire and qrp power [4W SSB] I worked 85
countries in
5 months. There was TEP and Eskip enough that it included spots like
MacMurdo
and the Falklands from W1 land. Then a living got in the way... ;) I
hear its dead from many, they all answer the question, When did you
call
CQ there?",
they didn't. If no one is talking someone has to make the first
noise.
Generally true
most bands but generally 10 and 15 (and 17) will be daylite bands for a
while and
occasional night skip. Oh, and 6M is entering the E-skip season (least
here in USA)
and EU too and that happens any time for a few minutes or hours. The only
way
to know is to be there.
Allison
|
So we already have a filter to cut audio outside the 700-2800 range?? I was building a SSB-Mite from 4 State QRP Group.? I searched the messages for it and did not find anything.?? Can you tell us where in the uBitx schematic it is.? Curious to compare it to the SSB-Mite.? -- Lee - N9LO? "I Void Warranties"
?
|
Re: Teensy I2c on wire2 (SDA2/SCL2)
#ubitx
I don't think the issue is the bus voltage. The issue is getting the SDA2 and SCL2 pins to work instead of SDA1 and SCL1. The Wire library seems to only handle SDA and SCL, not any of the other SDA/SCL combinations available on the Teensy. tim ab0wr On Thu, 31 May 2018 23:31:32 -0500 "AA9GG" <paul.aa9gg@...> wrote: Haven't tried it, but remember that the si part is running at 3v and
the display is at 5v. Therfore you will need to use 4.7k resistors
to pull the SDA and SCL lines to 3v (NOT 5v). Make sure you remove
the pull-ups off of the lcd if they are present and just use the ones
in the si circuit.
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Re: BITX QSO Afternoon/Evening, Sunday, June 3, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.
Until I resolve my microphone input level I will be working CW, only. I'll call CQ BITX on, or about, 7030 KHz starting around 1900 utc.
Dave WS1ETI
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Re: Teensy I2c on wire2 (SDA2/SCL2)
#ubitx
Or, you can use a DC-DC converter.
Jack, W8TEE
On Friday, June 1, 2018, 12:31:43 AM EDT, AA9GG <paul.aa9gg@...> wrote:
Haven't tried it, but remember that the si part is running at 3v and the display is at 5v.?? Therfore you will need to use 4.7k resistors to pull the SDA and SCL lines to 3v (NOT 5v).? Make sure you remove the pull-ups off of the lcd if they are present and just use the ones in the si circuit. -- Paul Mateer, AA9GG
Elan Engineering Corp.
NAQCC 3123, SKCC 4628
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K9HZ
Allard PE1NWL
Lee