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Alinco DR-135 Mk III Spurs on key up issue

 

The Alinco DR-135 series are good radios for VARA RF Wide as it they have an analog unfiltered interface.? I have a number of these.? I was just made aware of a potential problem with the Mark 3 versions.? Spurs on keyup (see attached article).? I was able to duplicate the problem on two Mark 3 radios but I did not see the problem on two Mark 2 version radios,? There is a potential fix that involves removing two components.? I will try the fix when I have time.

Alinco DR-135 Spurious Transmission - 2025 Mar-Apr SARC Communicator.pdf
Alinco DR-135 Spurious Transmission - 2025 Mar-Apr SARC Communicator.pdf
VECTOR Alinco radios PTT spurious emission fix.pdf
VECTOR Alinco radios PTT spurious emission fix.pdf

 

Speaking for the ARES group in the Washington state capitol, Olympia/Thurston Co. I am very interested in the outcome here.
Based on your report I will mod at least a couple of the radios used for VARA in the county.
 

Are they being used with mic/speaker audio, or the dedicated data port on the back? I used mic/speaker audio on my Mark II but could never realize high speeds with VARA-FM. As I recall, I resorted to mic/speaker audio because the rear audio port would not work for some reason.

Best regards,

Gary, K7EK

Radcliff, KY (EM77)

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On Mar 6, 2025, 19:27, at 19:27, "Bob W0EG via groups.io" <morrisnc7@...> wrote:
The Alinco DR-135 series are good radios for VARA RF Wide as it they
have an analog unfiltered interface.? I have a number of these.? I was
just made aware of a potential problem with the Mark 3 versions.? Spurs
on keyup (see attached article).? I was able to duplicate the problem
on two Mark 3 radios but I did not see the problem on two Mark 2
version radios,? There is a potential fix that involves removing two
components.? I will try the fix when I have time.
 

Gary,

Have you opened the radio to see if it has the optional internal TNC installed?? If so, remove the TNC and connect the 9pin directly to the motherboard.

On Fri, Mar 7, 2025 at 2:37?PM Gary - K7EK via <gary.k7ek=[email protected]> wrote:
Are they being used with mic/speaker audio, or the dedicated data port on the back? I used mic/speaker audio on my Mark II but could never realize high speeds with VARA-FM. As I recall, I resorted to mic/speaker audio because the rear audio port would not work for some reason.

Best regards,

Gary, K7EK

Radcliff, KY (EM77)

?Get BlueMail for Android ?

On Mar 6, 2025, 19:27, at 19:27, "Bob W0EG via " <morrisnc7=[email protected]> wrote:
>The Alinco DR-135 series are good radios for VARA RF Wide as it they
>have an analog unfiltered interface.? I have a number of these.? I was
>just made aware of a potential problem with the Mark 3 versions.? Spurs
>on keyup (see attached article).? I was able to duplicate the problem
>on two Mark 3 radios but I did not see the problem on two Mark 2
>version radios,? There is a potential fix that involves removing two
>components.? I will try the fix when I have time.
>
>
>
 

I have the optional TNC, however removed it years ago, as it is sub par as compared to a 'real' TNC. I don't recall whether the DB9 was plugged directly into the motherboard. I'll have to open it and see. Thanks for the tip.

Best regards,

Gary, K7EK


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On Mar 7, 2025, 14:56, at 14:56, "Bob W0EG via groups.io" <morrisnc7@...> wrote:
Gary,

Have you opened the radio to see if it has the optional internal TNC
installed? If so, remove the TNC and connect the 9pin directly to the
motherboard.

On Fri, Mar 7, 2025 at 2:37?PM Gary - K7EK via groups.io <gary.k7ek=
[email protected]> wrote:

Are they being used with mic/speaker audio, or the dedicated data
port on
the back? I used mic/speaker audio on my Mark II but could never
realize
high speeds with VARA-FM. As I recall, I resorted to mic/speaker
audio
because the rear audio port would not work for some reason.

Best regards,

Gary, K7EK

Radcliff, KY (EM77)

?Get BlueMail for Android ?

On Mar 6, 2025, 19:27, at 19:27, "Bob W0EG via groups.io" <morrisnc7=
[email protected]> wrote:
The Alinco DR-135 series are good radios for VARA RF Wide as it they
have an analog unfiltered interface. I have a number of these. I
was
just made aware of a potential problem with the Mark 3 versions.
Spurs
on keyup (see attached article). I was able to duplicate the
problem
on two Mark 3 radios but I did not see the problem on two Mark 2
version radios, There is a potential fix that involves removing two
components. I will try the fix when I have time.

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