Saber / SS unsquelch on DES transmission

[corruptRSS]

I have been attempting to get a Saber / SS, without a key installed, to unsquelch
when an encrypted signal is received on frequency.

No PLL, signaling etc is involved.

I am able to get the unit 'unmute', it seems, however the 'hash/white-noise' does not pass to audio.

Any ideas ?

thanks

jack

[Hartley]

Have you tried removing the Securenet module entirely and putting in the "dummy" module?

Hartley

[corruptRSS]

thanks Hartely, that did the trick. I was able to pass the 'hash' onto the secondary unit.

Unfortunately, the results did not allow me to achieve my objective. It seems that once the audio passes from the receive unit, the encryption key, or something, is not passed through.

Here's what's going on.

I'm working on building a repeater utilizing two sabers.

The result is quite acceptable, until we get to the 'encrypted' aspect.

The second step was/is, to integrate encryption into the setup.

Initially, I was able to receive, from H-H 1 rptr.unit (A), and then transfer audio and PTT to transmit rptr. unit (B).

Passing 'clear voice' works well. However, as expected, decoding with rptr. unit A, and then re-encoding by rptr. unit B adds an additional layer, doubling, of the DES/DES-XL 'distortion'. Essentially, encrypting the encrypted/unencrypted magnifies the distortion etc.

Although the audio is intelligeble between H-H 1 to H-H 2 utilizing the above, I am hoping to determine how to eliminate the secondary encryption of rptr. unit B and pass the H-H encrypted signal through the prtr., unprocessed, and utilize encryption on the Hand-Held units only.

Any ideas ?

thanks,
jack

[Hartley]

I think you may need to provide two different paths for the repeated signal - one for normal audio, and one for Securenet, as I suspect just passing the "audio" from one Saber to another will result in very poor operation due to the distortion introduced by the audio stages.

What you will need to do is pick off the detected signal (the input to the Securenet module is probably a good place), make sure it doesn't get distorted, and re-inject it into the TX exciter unit (again at the Securenet module point). It WILL be tricky to get this to work, as that is a very wide signal, and sensitive to distortion. In the old MICOR repeaters that passed Securenet, they ended up reclocking/regenerating the data before transmission to make it work - the same way P25 works now.

73 DE Hartley

p.s. It won't be legal to use Securenet on pretty much ANY band in the future - as soon as Part 90 goes narrowband. It will NOT fit into a narrowband channel.

[corruptRSS]

thanks, Hartley

I'm at the edge of my abilities so I'm looking at a rather steep learning curve here.

I'm off in search of the technical aspects of this endeavor.

jack