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ptt ubitx v6 ext amplifier #v6

 

Hi, does anyone have a solution to connect an external linear amplifier control circuit to ubitx v6.1, thanks.
 

Hi Brunetto,

I¡¯m sorry I? took so long to respond.
Here is my successful uBitx v6 PTT connection to the XDT-PA70.

The PTT on the XDT-PA70 can be triggered in two different ways depending on the version of?XDT-PA70 you have.

  1. some versions use a contact closure
  2. my version uses a 5vdc signal that draws 2 ma.

My version of the XDT-PA70 amplifier requires the 5vdc to trigger the PTT (transmit) signal. You can tell if your XDT-PA70 is this version by locating the opto-coupler chip (EL 817) see photo (PA70 ptt opto.jpg).
These instructions only apply to this type of signal. If you do not have the opto coupler EF 817 then your version will require a contact closure to indicate transmit and somebody else can direct you to a contact closure on the uBitx v6.

?

The 5 volt signal is generated by the uBitx and can be found at the junction of C150 and R 150 called T/R on the schematic. see schematic (uBitx TR schematic.jpg) and photo (ubitx TR location.jpg). you will notice I just soldered two wires red 5vdc on the junction of C150 and R150 and black on the other side of C150 (ground).

I connected this to the ptt plug that came with the XDT-PA70 see photo (PA70 ptt opto.jpg) red to pin 1 and black to pin 2 see (XDT-PA70 schematic.jpg)

?

I hope this helps

--
?

73
Mick VA3EPM?

PA70 ptt opto.jpg
uBitx TR location.jpg
uBitx TR schematic.jpg
XDT-PA70 schematic.jpg

 

It seems I have the worst of both worlds.? I have a uBTIX ver 6 and the amplifier I purchased DOES NOT have an opto-coupler.? Since I'm completely at sea regarding construction techniques, could someone tell me if its possible to use an opto-coupler by installing it between C150/R150 and the output jack I installed on the rear of the uBTIX?
 

Can you send a schematic of the amp?


On Sun, Apr 23, 2023, 2:04 PM <merle.spartan.63@...> wrote:
It seems I have the worst of both worlds.? I have a uBTIX ver 6 and the amplifier I purchased DOES NOT have an opto-coupler.? Since I'm completely at sea regarding construction techniques, could someone tell me if its possible to use an opto-coupler by installing it between C150/R150 and the output jack I installed on the rear of the uBTIX?

 

Unfortunately, I can't.? The amp is an XTD-PA100 (made in China), which I purchased from ebay.? I've included the blub on it although I don't know that It will be of any help.? Perhaps there are others who have purchased the same item who have more information.

?PA100 100w 3~30Mhz Shortwave Power Amplifier HF Amplifier RF w/Case????????????????????

Note: This is a universal version that supports all radios. It comes with no filters or trigger lines. You need to make the trigger line by yourself. If you need a trigger line, please contact us to purchase separately.
????????????????
Description:
- This product is a debugged finished product, directly connected to the radio, the power supply can work, with its own transceiver switching, the circuit is AB linear amplifier for ssb ,cw, am, fm power amplification.
- Suitable for FT817 KX3/KN-Q10,KN850,KN990/?Xiegu X5105 G90S G1M
- Can be used as general wireless radio, short wave transmission, RF drive? linear amplifier


Features:
- Frequency range: 3-30mhz
- Power supply voltage :12v-16v
- Current: 6-10 A
- Maximum input power: 10w
- Maximum output power: 100w
- Weight :240g
- Input and output interface£º SMA-K
- Amplifier gain: 10- 18DB

Package List£º
- 1 x 3~30Mhz 100w Shortwave Power Amplifier
 

I have this schematic which is for a 70W amp.? I think it MAY be the same as for the 100W amp.? The only difference may be some component changes.
 

¿ªÔÆÌåÓý

at 12-16V and 6-10A the PA cannot give 100W !!

On 23-Apr-23 2:31 PM, merle.spartan.63@... wrote:

Unfortunately, I can't.? The amp is an XTD-PA100 (made in China), which I purchased from ebay.? I've included the blub on it although I don't know that It will be of any help.? Perhaps there are others who have purchased the same item who have more information.

?PA100 100w 3~30Mhz Shortwave Power Amplifier HF Amplifier RF w/Case????????????????????

Note: This is a universal version that supports all radios. It comes with no filters or trigger lines. You need to make the trigger line by yourself. If you need a trigger line, please contact us to purchase separately.
????????????????
Description:
- This product is a debugged finished product, directly connected to the radio, the power supply can work, with its own transceiver switching, the circuit is AB linear amplifier for ssb ,cw, am, fm power amplification.
- Suitable for FT817 KX3/KN-Q10,KN850,KN990/?Xiegu X5105 G90S G1M
- Can be used as general wireless radio, short wave transmission, RF drive? linear amplifier


Features:
- Frequency range: 3-30mhz
- Power supply voltage :12v-16v
- Current: 6-10 A
- Maximum input power: 10w
- Maximum output power: 100w
- Weight :240g
- Input and output interface£º SMA-K
- Amplifier gain: 10- 18DB

Package List£º
- 1 x 3~30Mhz 100w Shortwave Power Amplifier
 

I don't expect it does.? I think the manufacturer is rather generous(?) with his power output claims.
 

¿ªÔÆÌåÓý

Just that?

?

From: [email protected] <[email protected]> On Behalf Of Raj vu2zap
Sent: Sunday, April 23, 2023 5:49 AM
To: [email protected]
Subject: Re: [BITX20] ptt ubitx v6 ext amplifier

?

at 12-16V and 6-10A the PA cannot give 100W !!

On 23-Apr-23 2:31 PM, merle.spartan.63@... wrote:

Unfortunately, I can't.? The amp is an XTD-PA100 (made in China), which I purchased from ebay.? I've included the blub on it although I don't know that It will be of any help.? Perhaps there are others who have purchased the same item who have more information.

?PA100 100w 3~30Mhz Shortwave Power Amplifier HF Amplifier RF w/Case????????????????????

Note: This is a universal version that supports all radios. It comes with no filters or trigger lines. You need to make the trigger line by yourself. If you need a trigger line, please contact us to purchase separately.
????????????????
Description:
- This product is a debugged finished product, directly connected to the radio, the power supply can work, with its own transceiver switching, the circuit is AB linear amplifier for ssb ,cw, am, fm power amplification.
- Suitable for FT817 KX3/KN-Q10,KN850,KN990/?Xiegu X5105 G90S G1M
- Can be used as general wireless radio, short wave transmission, RF drive? linear amplifier


Features:
- Frequency range: 3-30mhz
- Power supply voltage :12v-16v
- Current: 6-10 A
- Maximum input power: 10w
- Maximum output power: 100w
- Weight :240g
- Input and output interface£º SMA-K
- Amplifier gain: 10- 18DB

Package List£º
- 1 x 3~30Mhz 100w Shortwave Power Amplifier

?


--

¡­_. _._
 

I've just had a brain f*art.? I wonder if the following circuit variation on the VA3EPM amp trigger is a possible solution.? I've absolutely NO construction or design experience so I'd appreciate it if anyone could tell me if this is a viable solution or if its absolute rubbish.? ANY comments/suggestions are welcome.
 

Hi Merle,
Short answer is No.? The C150,R150 junction is the T/R signal from the Raduino/Nano.
so the other side of C150 is at GND.? You have it drawn as +5 VDC.
From a quick search, I didn't find the original circuit from VA3EPM to compare.

If wanting to use a relay, copy the uBITX relay driver and not drive a relay directly from Nano.
Last year, I built a project using a 12V relay board from Amazon
ASIN ? : ??B097F3W37C
This breakout board is easy to use. contains driver, and jumper to select energize on H or L.?

I recommend handling the amp switching through an opto-coupler.
A photo MOSFET, makes it easy to low side switch.

https://www.mouser.com/datasheet/2/408/TLP3558A_datasheet_en_20200325-1916539.pdf

There are numerous opto-coupler breakout boards out there too.

Rgds,
Gary
 

Sorry for my duplicate message on a new thread (now deleted)
It appears that Merle's message to which I was replying was deleted and reposted.
Gary
 

I'm submitting this schematic in hope that I've got it right this time.? I worked on the premise the amp keys when the key line goes to ground.? Could someone please let me know if this is more rubbish or if I'm on the right track?? The amp is one of these Chinese linear amps which purports to a 100 watt output.? Also, does ANYONE have a schematic for said amp?? if so, could you send it to me?? Thanks in advance.
 

Hi Merle,
Logically, it looks like that would work.? However you need a current limiting resistor to the LED.
I haven't built and tested the circuit.? But a starting point bias would be ~1.64V, 10mA.
So (5V-1.64V)/10 mA = 336 ohms.? Choose standard E12 resistor value of 333 Ohms.
(this can be placed? in series with the red +5V line you drew)
The nano output is rated for 40mA max, so you should be OK.? But stay aware of the extra loading.

I used the TLB 3558A for a conceptual design to control a AL-811H amp (with 100mA of current to sink)
Most likely not the most cost effective IC. (given the product cost and the postage when you have to pay for it)
The Chinese amp doesn't need the PTT controller to sink nearly that much current.
So please don't get stuck on the TLB 3558A??because I happen to throw it out there.

Be happy with yourself that you are walking through the problem and learning.
The more you put in, the more others will put in to help you.?
There are many satisfactory solutions.? Most are biased to parts on hand, or cheap to acquire.

Rgds,
Gary

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