I do have a device I can use to probe. But max rf voyage is 3v. ?I would have to use resistors with a little trick Jeffery here in the group taught me. I suppose I can try that route and see what it reads.?
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Show quoted text
On Nov 2, 2018, at 12:34 PM, iz oos < and2oosiz2@...> wrote: I hope your coming wattmeter will come properly set with reliable readings at least for CW keydown or average SSB power. It seems there are many cases they sell stuff non properly set. When I got the licence I too had bought a new swr-power which was showing misleading values. Luckily enough at the local ham radio club my elmers not only found the problem but in few minutes set it right (three trimmers....). I have to say my wattmeter was neither Chinese nor Indian (!!!!) but made in Japan... A reliable and cheap way to measure the power (not the swr) on CW keydown is the RF detector as the one sold by Hendricks.
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Re: Harmonics and Relay Replacement
Hi all.
I was looking for the specs of the L5 and L7 replacement. I cannot find the exact yellow ones on the internet. The NLT on comkey are not there. They have NLV type. Is this a typo??
Please your source for me and some other builders in my club. We found the relays.But are looking for this parts.
Rob PA0RBL
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Re: Harmonics and Relay Replacement
I'd appreciate advise on whether the 5303 should work, or whether it was a typo, since it's what I ordered.? The 5303 has a coil power of 200mw, vs. 400mw for the 5403.? See attached data sheet for other factors.
73, Al - va3iaw
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Dammit!? that email is gmail.
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Hmm, not sure my email was typed properly. nz0tham@...I would entertain offers. 73, Bill NZ0T
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I hope your coming wattmeter will come properly set with reliable readings at least for CW keydown or average SSB power. It seems there are many cases they sell stuff non properly set. When I got the licence I too had bought a new swr-power which was showing misleading values. Luckily enough at the local ham radio club my elmers not only found the problem but in few minutes set it right (three trimmers....). I have to say my wattmeter was neither Chinese nor Indian (!!!!) but made in Japan... A reliable and cheap way to measure the power (not the swr) on CW keydown is the RF detector as the one sold by Hendricks.
Il 02/nov/2018 03:11, "Joe Puma" < kd2nfc@...> ha scritto: Ok? got it.
> On Nov 1, 2018, at 4:10 PM, Clark Martin <kk6isp@...> wrote:
>
> I should have said you need to subtract the Tx idle current instead of the Rx idle current.
>
> Sent from an iPhone, don't ask whose.
>
>> On Nov 1, 2018, at 12:13 PM, Clark Martin <kk6isp@...> wrote:
>>
>> You also need to subtract the Tx idle current.? You can find this by keying up the mic with no audio input.? This current is mainly the bias current in the finals but also the relays and some other things.? The Tx idle current will vary with band.
>>
>>
>>> On Nov 1, 2018, at 11:07 AM, Joe Puma <kd2nfc@...> wrote:
>>>
>>> Hey guys,
>>>
>>> I will probably have a watt meter in the coming weeks but I still haven¡¯t measured my power out on the uBitx. So with a dummy load hooked up I took some power measurements with my DMM. I am not sure if this is a good way to tell power output but here are some measurements.
>>>
>>>
>>> Voltage is 12.67 Radio idle and 12.45 while Tx¡¯ing. not sure which one matters most when calculating power or if the difference is negligible but I calculated wattage from the 12.45v
>>>
>>> band? ? ? ? current? ? ? ? watts
>>> 80? ? ? ? ? ? 2.18? ? ? ? ? ? 27.14
>>> 60? ? ? ? ? ? 1.50? ? ? ? ? ? 18.67
>>> 40? ? ? ? ? ? 1.97? ? ? ? ? ? 24.52
>>> 30? ? ? ? ? ? 1.42? ? ? ? ? ? 17.67
>>> 20? ? ? ? ? ? 1.65? ? ? ? ? ? 20.54
>>> 17? ? ? ? ? ? 1.22? ? ? ? ? ? 15.18
>>> 15? ? ? ? ? ? 1.15? ? ? ? ? ? 14.31
>>> 10? ? ? ? ? ? 1.0? ? ? ? ? ? 12.45
>>>
>>> If I take into consideration the .33a for radio idle (4w) is my RF wattage 4w less then my measurements.
>>
>> Clark Martin
>> KK6ISP
>> Another Designated Engineer on the Information Super Railway.
>>
>>
>>
>>
>
>
>
>
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Is that the uBitx v5?
--
72 and God bless
KD4EPG
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Re: PSK31 ghosts below my signal
On Fri, Nov 02, 2018 at 07:33:50AM -0700, Don - KM4UDX wrote: Paranormal signal is about eyeballing 1400khz (I think??) below. Receiving websdr is miles away.? I think you meant Hz not KHz.
If I reduce drive the ghost appears proportionally reduced.
? ?I was told by a club member that my radio was not suppressing the carrier. But I'm not smart enough to diagnose that, hence the pictures..hahah.
That's easy to check. Put the radio into transmit but do not feed it any audio at all. Do you still see the signal? If so that's the carrier. If it only appears with a tone into the radio then that's an opposite side band suppression problem. I see no attached graphics if you were trying to attach some.
Don
Km4udx
Diane -- - db@... db@...
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Sorry, I should have also included the place where the receive path is tapped on the BITX40. It is on a separate page .
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Yes, it works just as well on the BITX40. Instructions can be found on ND6T.com .
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Re: PSK31 ghosts below my signal
Paranormal signal is about eyeballing 1400khz (I think??) below. Receiving websdr is miles away.?
If I reduce drive the ghost appears proportionally reduced.
? ?I was told by a club member that my radio was not suppressing the carrier. But I'm not smart enough to diagnose that, hence the pictures..hahah.
Don
Km4udx
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Re: PSK31 ghosts below my signal
On Fri, Nov 02, 2018 at 01:03:40PM +0530, Raj vu2zap wrote: On 80M the relays make a big difference to spurs.
The ghost will be around -35db at the worst.. not stronger than that.
Reduce the drive and see what happens. This sounds more like opposite side band is not being suppressed properly, but hard to tell without more information. If it's a filter problem the signal will be inverted.
Raj
At 02-11-18, you wrote:
Hello! I installed a sound card, checked drive levels, and monitored my psk31 via a online sdr that could hear me. I was thrilled to see my signal...I was getting out! I was also sending a mirror below my signal. I've been told my radio does this, and here I could capture it without using my own SDR. The online SDR was not over driven, as far as I can tell, so this looks like a problem on my end. The ghost signal looks almost the same signal strength as my target frequency! Is there anything I can do about this...or is this fixed with the inductors/relays?
How far away from your main signal is it? Does it always appear below your main signal by the same amount?
And thank you all sooo much as always.
[]
Diane -- - db@... db@...
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Re: PSK31 ghosts below my signal
On 80M the relays make a big difference to spurs.
The ghost will be around -35db at the worst.. not stronger than
that.
Reduce the drive and see what happens.
Raj
At 02-11-18, you wrote:
toggle quoted message
Show quoted text
Hello!? I installed a sound
card, checked drive levels, and monitored my psk31 via a online sdr that
could hear me. I was thrilled to see my signal...I was getting out!?
I was also sending a mirror below my signal. I've been told my radio does
this, and here I could capture it without using my own SDR. The online
SDR was not over driven, as far as I can tell, so this looks like a
problem on my end.? The ghost signal looks almost the same signal
strength as my target frequency!? Is there anything I can do about
this...or is this fixed with the inductors/relays?
And thank you all sooo much as always.
![[]](/g/BITX20/attachment/61228/)
?
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Re: Harmonics and Relay Replacement
I was having few NLT25T-R68J-PF?? made by TDK, as I bought from ? , a Bangaluru based seller? of
India.
as Per spec they are 5% tol. and shielded.
You are right Jerry! I goofed on this 330uH !
At 02-11-18, you wrote:
>Gene,
>
>
>Raj found that replacing the toroids at L5 and L7 with 1210 surface mount inductors of 680nH improved the spurs.
>Note that he used a specific brand and part number of inductor, some of the others he tried did not work so well.
>
>He also swapped out L1,2,3,4 with surface mount inductors of the same type and saw some improvement there too.
>His post says to get four of 330nH for those, but I'd think it should be two of 330nH and two of 390nH.
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Re: Harmonics and Relay Replacement
You are right Jerry! I goofed on this 330uH !
toggle quoted message
Show quoted text
At 02-11-18, you wrote: Gene,
Raj found that replacing the toroids at L5 and L7 with 1210 surface mount inductors of 680nH improved the spurs.
Note that he used a specific brand and part number of inductor, some of the others he tried did not work so well.
He also swapped out L1,2,3,4 with surface mount inductors of the same type and saw some improvement there too.
His post says to get four of 330nH for those, but I'd think it should be two of 330nH and two of 390nH.
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Re: Harmonics and Relay Replacement
Gene,
Change the relays for sure. 3 axicom will do for KT1,2,3
With relay change the spurs decrease with lower 3rd 5th harmonics. You
can change L5/7... they are same as
original values or close to. You have to replace them exactly to what was
shown earlier.
The one I used is 1210 680nH a yellow one from EPCOS / TDK shielded.
Others wont work..
The mod is to reduce spurs. L5/7 is optional, relays you MUST
change.
Raj
At 02-11-18, you wrote:
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Show quoted text
HI Raj,
Thanks for the info, I have the relays on order.
Should I also change L5/7 at the same time?? (Exactly what is the
L5/7 Change?, Is it a value change or just convert to SMT?)
Gene N2IJF
From: [email protected]
<[email protected]> on behalf of Raj vu2zap
<rajendrakumargg@...>
Sent: Thursday, November 1, 2018 1:25 AM
To: [email protected]
Subject: Re: [BITX20] Harmonics and Relay Replacement
?
Hi Gene,
There is no final solution.
So far my conclusions... the harmonics floating around the board is the
cause of the spurs.
Changing the L5/7 reduced the spurs but not the cause which is
harmonics.
Changing 3 relays KT1/2/3 reduces the harmonics dramatically specially on
lower bands.
Lower bands 40/80 can be driven higher without crossing the red
line!
Keep the drive/mic level at where you get 10W on 40M and you should be
kosher
without SMD coils on higher bands.
If you over drive the uBitx on higher bands then you will be in the
red!
Some boards behave a bit different, relays are a good simple mod bet for
now.
Raj
At 01-11-18, you wrote:
Sorry to ask but I been offline
for a few weeks and the subject seems to have died out (after reading
past posts).? So is there a final solution for the spurs/harmonics
for the V3 uBitX?
- Axicom replacements (soldered directly to PWB)?
- Axicom replacements with SMD inductors?
- K5BCQ uBITX Relay Switched LPF/BPF board?
I have an unbuilt V3 that I am not sure if I should even
complete.? I want to be legal but do not have a lot of test
equipment so verification will be difficult.
Thanks,
Gene N2IJF
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PSK31 ghosts below my signal
Hello!? I installed a sound card, checked drive levels, and monitored my psk31 via a online sdr that could hear me. I was thrilled to see my signal...I was getting out!? I was also sending a mirror below my signal. I've been told my radio does this, and here I could capture it without using my own SDR. The online SDR was not over driven, as far as I can tell, so this looks like a problem on my end.? The ghost signal looks almost the same signal strength as my target frequency!? Is there anything I can do about this...or is this fixed with the inductors/relays? And thank you all sooo much as always. 
|
Re: QSX 10W HF Linear PA kit
I am thinking of putting a dummy load on the unused portion of the heat sink.
Mount a switch to select antenna or dummy load.
--
Mike
AI4NS
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My recent ubitx arrived with lsb bfo way off. Possibly these boards are okay, don't rule out something simple. Do note eith no agc, when signals are weak one must crank up the audio gain.
Curt
|
Ok got it.
toggle quoted message
Show quoted text
On Nov 1, 2018, at 4:10 PM, Clark Martin <kk6isp@...> wrote:
I should have said you need to subtract the Tx idle current instead of the Rx idle current.
Sent from an iPhone, don't ask whose.
On Nov 1, 2018, at 12:13 PM, Clark Martin <kk6isp@...> wrote:
You also need to subtract the Tx idle current. You can find this by keying up the mic with no audio input. This current is mainly the bias current in the finals but also the relays and some other things. The Tx idle current will vary with band.
On Nov 1, 2018, at 11:07 AM, Joe Puma <kd2nfc@...> wrote:
Hey guys,
I will probably have a watt meter in the coming weeks but I still haven¡¯t measured my power out on the uBitx. So with a dummy load hooked up I took some power measurements with my DMM. I am not sure if this is a good way to tell power output but here are some measurements.
Voltage is 12.67 Radio idle and 12.45 while Tx¡¯ing. not sure which one matters most when calculating power or if the difference is negligible but I calculated wattage from the 12.45v
band current watts
80 2.18 27.14
60 1.50 18.67
40 1.97 24.52
30 1.42 17.67
20 1.65 20.54
17 1.22 15.18
15 1.15 14.31
10 1.0 12.45
If I take into consideration the .33a for radio idle (4w) is my RF wattage 4w less then my measurements. Clark Martin
KK6ISP
Another Designated Engineer on the Information Super Railway.
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Don, ND6T
Raj vu2zap