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FT710 to LA1K

 

I was sold a "band cable" that is thought to connect to the 8 pin "Tuner/Linear" port on the F710 (upper left on the back) and that it will supply band information to LA1K when the other end is plunged into the back of LA1K.? This "band cable" is Ameritron DB 8MY2.

Of course, the LA1K needs to know when the FT710 transmits.? ?The manual for the FT710 seems to indicate that the 8 pins include a transmitter "ground" and a "transmitter inhibit."? Does the LA1K use those two signals to effect PTT?? (pulled low on transmit)

Details on how one has used FT710 with LA1K will be most welcome.

73? ? James? ? N8TT
 

At last, some useful assistance.? Many thanks.??
It is possible that the "band cable" that I have will perform all of the needed tasks.? Need DB9 pin 7 to go to ground when transmitting, and need to have the four "band" lines properly connected.
What about the other four DB9 pins?

Before using the "DB 8MY2" cable I need to measure the signals it provides and verify that it seems to work.? ?I expect that using a resistor as a probe of the DB9 is a safe way to measure with the other end connected to FT710.??

Sure wish we all had a good schematic and maintenance manual.
Have not received a response from PALSTAR.? Several of their Email addresses no longer work.

Thanks Kent? ? Did you make your own cable or an off-the-shelf cable?

James / Mac? ? N8TT

------ Original Message ------
From "Kent Trimble" <k9ztv@...>
Date 8/30/2024 5:34:00 PM
Subject Re: [la1k] FT710 to LA1K

James ...

FT-710 TUNER/LINEAR? ? ????????? LA-1K RADIO INTERFACE (DB9)

RESET(BAND D).........................Pin 8
BAND C........................................Pin 9
TX D(BAND A).............................Pin 2
TX GND........................................Pin 7
RX D(Band B)...............................Pin 1

The LA-1K is keyed either by the transceiver's TX GND connected to Pin 7 in the amp . . . or . . . TX GND in the 710 connected to the PTT RCA Phono jack on the back of the LA-1K.? Either will work? fine, but not both.? One or the other, but not both.? I use PIN 7 in the LA-1K's DB9 jack.

Secondly, by connecting the FT-710's band-data lines, the amplifier follows the transceiver's band changes instantly.? This has the advantage of having the amp's relays closed and settled before any RF hits them.

Ignore TX INHIBIT.

73,
Kent
K9ZTV




On 8/29/2024 7:38 PM, James wrote:
I was sold a "band cable" that is thought to connect to the 8 pin "Tuner/Linear" port on the F710 (upper left on the back) and that it will supply band information to LA1K when the other end is plunged into the back of LA1K.? This "band cable" is Ameritron DB 8MY2.

Of course, the LA1K needs to know when the FT710 transmits.? ?The manual for the FT710 seems to indicate that the 8 pins include a transmitter "ground" and a "transmitter inhibit."? Does the LA1K use those two signals to effect PTT?? (pulled low on transmit)

Details on how one has used FT710 with LA1K will be most welcome.

73? ? James? ? N8TT




Virus-free.

 

The company Associated Radio makes cables to interconnect between rigs and the LA-1K, if you need a cable that is not listed I believe that they will make one for you.
www.associatedradio.com
--
Glen, WB4KTF, Austin, TX
Licensed since 1968
 

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James ...

Additional information you will need and decisions you need to make:

Question 1:? Do you intend to operate CW with your LA-1K?

If so, choose DIRECT keying mode in the LA-1K, but understand that DIRECT keying mode requires that a band-data cable be inserted in the DB9 jack.? Without this cable, the LA-1K reverts to NORMAL keying which has the disadvantage of causing the first Morse character to be truncated.? An extended discussion of this issue can be found here:?

Likewise, the LA-1K manual says on page 21:




Question 2:? Do you intend to operate QSK (full break-in) with your LA-1K?

Many CW operators do.? Unfortunately, the LA-1K is not designed for QSK but can be made so by inserting an external electronic T/R switch between the transceiver and the amplifier.? There are several out there but the very best is the DX Connections QSK-2500.? It is hand-made by K3HZP who offers excellent technical support.? While the current price of $425 may seem high, it is less than what Palstar would have to charge to redesign the LA-1K.? It has the added advantage of being portable and able to make any non-QSK amplifier a fully-QSK one.? I have two of them, one for the LA-1K and one for vintage equipment.? I use it nightly with a TS-890S on CW traffic nets at speeds up to 30 wpm and is totally transparent.

The main DX Connections QSK-2500 website is here:?

Let me know if I can help further.

73,
Kent
K9ZTV






On 8/30/2024 10:54 PM, James wrote:

At last, some useful assistance.? Many thanks.??
It is possible that the "band cable" that I have will perform all of the needed tasks.? Need DB9 pin 7 to go to ground when transmitting, and need to have the four "band" lines properly connected.
What about the other four DB9 pins?

Before using the "DB 8MY2" cable I need to measure the signals it provides and verify that it seems to work.? ?I expect that using a resistor as a probe of the DB9 is a safe way to measure with the other end connected to FT710.??

Sure wish we all had a good schematic and maintenance manual.
Have not received a response from PALSTAR.? Several of their Email addresses no longer work.

Thanks Kent? ? Did you make your own cable or an off-the-shelf cable?

James / Mac? ? N8TT

------ Original Message ------
From "Kent Trimble" <k9ztv@...>
Date 8/30/2024 5:34:00 PM
Subject Re: [la1k] FT710 to LA1K

James ...

FT-710 TUNER/LINEAR? ? ????????? LA-1K RADIO INTERFACE (DB9)

RESET(BAND D).........................Pin 8
BAND C........................................Pin 9
TX D(BAND A).............................Pin 2
TX GND........................................Pin 7
RX D(Band B)...............................Pin 1

The LA-1K is keyed either by the transceiver's TX GND connected to Pin 7 in the amp . . . or . . . TX GND in the 710 connected to the PTT RCA Phono jack on the back of the LA-1K.? Either will work? fine, but not both.? One or the other, but not both.? I use PIN 7 in the LA-1K's DB9 jack.

Secondly, by connecting the FT-710's band-data lines, the amplifier follows the transceiver's band changes instantly.? This has the advantage of having the amp's relays closed and settled before any RF hits them.

Ignore TX INHIBIT.

73,
Kent
K9ZTV




On 8/29/2024 7:38 PM, James wrote:
I was sold a "band cable" that is thought to connect to the 8 pin "Tuner/Linear" port on the F710 (upper left on the back) and that it will supply band information to LA1K when the other end is plunged into the back of LA1K.? This "band cable" is Ameritron DB 8MY2.

Of course, the LA1K needs to know when the FT710 transmits.? ?The manual for the FT710 seems to indicate that the 8 pins include a transmitter "ground" and a "transmitter inhibit."? Does the LA1K use those two signals to effect PTT?? (pulled low on transmit)

Details on how one has used FT710 with LA1K will be most welcome.

73? ? James? ? N8TT




Virus-free.


 

Here is a keying cable is you just want to use RF sensing.
?

Here’s the cable you need for keying and band data.
?
?
I have that same Ameritron cable and it works great. Just be aware it’s very short so if you plan to go further away with the amp you’ll need an an extension which is easily found on Amazon.
?
Kory
[email protected]
 

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You really only need your keying cable and nothing else.? That’s one wire and t RCA plugs usually

?

From: [email protected] <[email protected]> On Behalf Of Glen Jenkins WB4KTF
Sent: Saturday, August 31, 2024 7:02 AM
To: [email protected]
Subject: Re: [la1k] FT710 to LA1K

?

The company Associated Radio makes cables to interconnect between rigs and the LA-1K, if you need a cable that is not listed I believe that they will make one for you.

--

Glen, WB4KTF, Austin, TX
Licensed since 1968

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