Preston,
?If it is indeed from a AM station I sell a BCI filter kit with instructions to install in the uBitx/Bitx40 radios for 5$
73
--
David
?N8DAH
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I am in a condo in Scottsdale, and have tried my new Ubitx on a MFJ 1622 apartment antenna and on a 40 meter half wave center fed dipole.? All I am getting is static on every band with some periodic continuous tones, although it worked in Wisconsin with a dipole.? The ARRL video on Youtube about the Ubitx says at the end, that there is an AM station within a mile that causes problems with the receiver.? They say to buy or build a band pass filter.? I am wondering if this is my problem.? Has anyone run into this?? If so, is there a brand and model that has worked for you?
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Looks nice. Thanks for sharing.?
Robert NQ0T?
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Found this guy on amazon, looks like it was made for this case. The inkits provided knob is functional, but wobbled a little bit on me, and I really missed a finger indent. 
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Re: Using Vacuum Tube heathkit as Linear Amplifier for QRP
Yes it did. I read it last night. I believe the same info is on the qrp labs website in the qsx area.
James
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Re: Using Vacuum Tube heathkit as Linear Amplifier for QRP
Hi Richard,
I copied the whole thing from one of the ARRL Handbooks. I'm sure I can find it again. I will have a look. I do still have the T-R switch and maybe even the coupling capacitor. That cap is a "gimmick" made from about three inches of RG-58. Don't let the "gimmick" label throw you over. It is more than a little twisted pair as sometimes used in receiver circuits for regenerative feedback.
I built mine in an old TV tuner metal box. I don't know what they have in TV sets for a tuner these days but I think it is an SDR front-end. An Altoids tin (or something similar) would work. The transistor is a 40673 dual gate mosfet and is now just about unobtanium. Fortunately there are plentiful substitutes. You could also use a vacuum tube <grin>.
More later after I dig out the details. It is so easy that even *I* could do it.
73,
Bill KU8H
toggle quoted message
Show quoted text
On 11/12/19 4:07 PM, Richard Spohn wrote: Bill, do you have the schematic for the solid-state T/R switch, or
even better, do you still have that switch? I am keenly interested in
an all-electronic (no relays) T/R switch for QSK. Building one from
scratch may be slightly outside my skill set tho. -- Rich WB2GXM
--
bark less - wag more
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Re: Using Vacuum Tube heathkit as Linear Amplifier for QRP
Didn't Hans QSX talk at FDIM and reprinted in QRPQ (October issue??) discuss a "relayless" TR switch?
Jack, W8TEE
On Tuesday, November 12, 2019, 4:08:07 PM EST, Richard Spohn <wb2gxm@...> wrote:
Bill, do you have the schematic for the solid-state T/R switch, or
even better, do you still have that switch?? I am keenly interested in
an all-electronic (no relays) T/R switch for QSK.? Building one from
scratch may be slightly outside my skill set tho. -- Rich WB2GXM
On 11/10/19, Bill Cromwell < wrcromwell@...> wrote: > Hi, > > In the 80s I built boots for an Ten Tec Argonaut 509 using the carcass > of a Heathkit DX-35. There is no receive circuitry involved. I biased > the single 6146 for class AB1 operation. I built a solid state T-R > antenna switch to keep the QSK feature of the 509. It served me for a > several years and then the 509 moved to a new home. The remains of the > DX-35 also went to another ham. > > I have the CW portion of a Heathkit DX-100 down for overhaul. The AM > phone parts were all gone when I got the DX-100. I am going to dpo the > mods to include the linear operation in phone mode to amplify SSB > signals and keep the class C operation for it's CW operation - ala the > Apache (TX-1). Grid block keying has already been part of this > particular DX-100. > > Sometimes QRP is just not enough. > > 73, > > Bill? KU8H > > On 11/10/19 7:35 AM, Don Richards wrote: >> Hi Gordon >> I ran across this a while back but never tried it. >> >> >> >> 73 Donve3ids > > -- > bark less - wag more > > > >
-- Jack, W8TEE
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Re: Using Vacuum Tube heathkit as Linear Amplifier for QRP
MFJ "Pin Diode Rig"....a model or part number?
toggle quoted message
Show quoted text
On 11/12/19, Gordon Gibby <docvacuumtubes@...> wrote: There is this MFJ pin diode rig that I managed to pick up on ebay for
$100. You might look around for another of those. They do take some
tinkering I'm told.
An even easier solution is to simply emulate the HW-16 and have TWO devices
--- one used for transmit and one used for receive -- and control both of
them with the same digitally created frequency (from a Raduino) and just
use diode protection of the input of the "receiver" just as many qrp rigs
do. There are probably a lot of schematics out there for creating a
diode switch also.
Gordon
On Tue, Nov 12, 2019 at 4:08 PM Richard Spohn <wb2gxm@...> wrote:
Bill, do you have the schematic for the solid-state T/R switch, or
even better, do you still have that switch? I am keenly interested in
an all-electronic (no relays) T/R switch for QSK. Building one from
scratch may be slightly outside my skill set tho. -- Rich WB2GXM
On 11/10/19, Bill Cromwell <wrcromwell@...> wrote:
Hi,
In the 80s I built boots for an Ten Tec Argonaut 509 using the carcass
of a Heathkit DX-35. There is no receive circuitry involved. I biased
the single 6146 for class AB1 operation. I built a solid state T-R
antenna switch to keep the QSK feature of the 509. It served me for a
several years and then the 509 moved to a new home. The remains of the
DX-35 also went to another ham.
I have the CW portion of a Heathkit DX-100 down for overhaul. The AM
phone parts were all gone when I got the DX-100. I am going to dpo the
mods to include the linear operation in phone mode to amplify SSB
signals and keep the class C operation for it's CW operation - ala the
Apache (TX-1). Grid block keying has already been part of this
particular DX-100.
Sometimes QRP is just not enough.
73,
Bill KU8H
On 11/10/19 7:35 AM, Don Richards wrote:
Hi Gordon
I ran across this a while back but never tried it.
73 Donve3ids
--
bark less - wag more
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Re: Using Vacuum Tube heathkit as Linear Amplifier for QRP
There is this MFJ pin diode rig that I managed to pick up on ebay for $100.? ?You might look around for another of those.? ?They do take some tinkering I'm told.? ??
An even easier solution is to simply emulate the HW-16 and have TWO devices --- one used for transmit and one used for receive -- and control both of them with the same digitally created frequency (from a Raduino) and just use diode protection of the input of the "receiver" just as many qrp rigs do.? ? There are probably a lot of schematics out there for creating a diode switch also.? ?
Gordon
On Tue, Nov 12, 2019 at 4:08 PM Richard Spohn < wb2gxm@...> wrote: Bill, do you have the schematic for the solid-state T/R switch, or
even better, do you still have that switch?? I am keenly interested in
an all-electronic (no relays) T/R switch for QSK.? Building one from
scratch may be slightly outside my skill set tho. -- Rich WB2GXM
On 11/10/19, Bill Cromwell <wrcromwell@...> wrote:
> Hi,
>
> In the 80s I built boots for an Ten Tec Argonaut 509 using the carcass
> of a Heathkit DX-35. There is no receive circuitry involved. I biased
> the single 6146 for class AB1 operation. I built a solid state T-R
> antenna switch to keep the QSK feature of the 509. It served me for a
> several years and then the 509 moved to a new home. The remains of the
> DX-35 also went to another ham.
>
> I have the CW portion of a Heathkit DX-100 down for overhaul. The AM
> phone parts were all gone when I got the DX-100. I am going to dpo the
> mods to include the linear operation in phone mode to amplify SSB
> signals and keep the class C operation for it's CW operation - ala the
> Apache (TX-1). Grid block keying has already been part of this
> particular DX-100.
>
> Sometimes QRP is just not enough.
>
> 73,
>
> Bill? KU8H
>
> On 11/10/19 7:35 AM, Don Richards wrote:
>> Hi Gordon
>> I ran across this a while back but never tried it.
>>
>>
>>
>> 73 Donve3ids
>
> --
> bark less - wag more
>
>
>
>
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Re: Using Vacuum Tube heathkit as Linear Amplifier for QRP
Bill, do you have the schematic for the solid-state T/R switch, or
even better, do you still have that switch? I am keenly interested in
an all-electronic (no relays) T/R switch for QSK. Building one from
scratch may be slightly outside my skill set tho. -- Rich WB2GXM
toggle quoted message
Show quoted text
On 11/10/19, Bill Cromwell <wrcromwell@...> wrote: Hi,
In the 80s I built boots for an Ten Tec Argonaut 509 using the carcass
of a Heathkit DX-35. There is no receive circuitry involved. I biased
the single 6146 for class AB1 operation. I built a solid state T-R
antenna switch to keep the QSK feature of the 509. It served me for a
several years and then the 509 moved to a new home. The remains of the
DX-35 also went to another ham.
I have the CW portion of a Heathkit DX-100 down for overhaul. The AM
phone parts were all gone when I got the DX-100. I am going to dpo the
mods to include the linear operation in phone mode to amplify SSB
signals and keep the class C operation for it's CW operation - ala the
Apache (TX-1). Grid block keying has already been part of this
particular DX-100.
Sometimes QRP is just not enough.
73,
Bill KU8H
On 11/10/19 7:35 AM, Don Richards wrote:
Hi Gordon
I ran across this a while back but never tried it.
73 Donve3ids --
bark less - wag more
|
Re: uBitx Version 4.3 calibration
Hi Vic
Where did you get this information from please?? There does not seem to be any other posts indicating version? 4.3, which I have, is different.? My radio "works" but has very low audio levels and receiver is quite deaf especially above 80m band. I am not sure how to approach this issue.
Cheers,
Rob
zl1rd@...
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Try swapping the Black, and Brown wires on the Volume control.
Black to the wiper, and Brown to the hot end. Sunil's instructions are incorrect.
Philip G7JUR
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Re: ubitx raduino issue/AKA the radio doesn't receive
you can use any waterfall (e.g. FLDGI, or even packet sound card software) to do the same.
On Tue, Nov 12, 2019 at 2:45 PM Evan Hand < elhandjr@...> wrote: zl1rd,
Most likely the problem is the BFO adjustment.? We would need more information on which model and what equipment you would have for testing.
I personally have found a free Audio Spectrum Analyzer (google one on the net) was the most helpful.? You can plug in a usb mic, have it close to the speaker of the uBitx, tune to a clear frequency, and adjust the BFO for the noise plateau to be centered between 500 and 3,000 hz.? The BFO has the most impact on the receive sensitivity.
There are other methods on .? You can search for them with BFO Setting or something simalar, just remember that the v3 and v4 are at a different frequency than the v5.
Hope that helps,
Evan
AC9TU
?
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Re: ubitx raduino issue/AKA the radio doesn't receive
zl1rd,
Most likely the problem is the BFO adjustment.? We would need more information on which model and what equipment you would have for testing.
I personally have found a free Audio Spectrum Analyzer (google one on the net) was the most helpful.? You can plug in a usb mic, have it close to the speaker of the uBitx, tune to a clear frequency, and adjust the BFO for the noise plateau to be centered between 500 and 3,000 hz.? The BFO has the most impact on the receive sensitivity.
There are other methods on groups.io.? You can search for them with BFO Setting or something simalar, just remember that the v3 and v4 are at a different frequency than the v5.
Hope that helps,
Evan
AC9TU
?
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Re: ubitx raduino issue/AKA the radio doesn't receive
Hi John Wonder if you have solved this problem?? I just finished my uBITX and experience the same issues you have....? receiver sensitivity very low etc.? Would you mind responding to zl1rd@...?and let me know about the progress you have made.? Your help is much appreciated. Regards, Rob zl1rd
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It caught me out too, audio not good, AGC not good so decided to trace wiring. What a difference it makes!!!!
G4GPF
That clever person could been me.
I see that the latest drawing is still wrong, This error has a long history.
Philip G7JUR
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Yes, the brown wire is actually v high and black is v medium.
On 12 Nov 2019 10:15 a.m., Justin Phillips K5AXL <dolmdemon@...> wrote: I'm confused, are you talking about the connection from the volume jack on the front panel board supplied by inkits? The brown and black wires are reversed?
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I'm confused, are you talking about the connection from the volume jack on the front panel board supplied by inkits? The brown and black wires are reversed?
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Yes, however the wire colour changed with the extra board. Apologies for miss spelling your name on my earlier post. Thanks again Philip.
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Well thanks Phillip, wiring it up correctly made a big difference to the ALC operation.... Cheers Maurice
On 12 Nov 2019 7:15 a.m., Philip <philip.g7jur@...> wrote: That clever person could been me.
I see that the latest drawing is still wrong, This error has a long history.
Philip G7JUR
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N8DAH
Preston
Robert Freeman