Problem Decoding (Various)

[Robbyboy]

Okay -
​

Ive throroughly racked my brain out on this one. Ive done so many different things and looked so many places that I dont even know everything that I have done anymore.

BC9000XLT with a discriminator tap installed. This mod was confirmed operational by by witnessing a new install of unitrunker (dos version) with immediate display of data within 60 seconds.


I get the radio home and no dice whatsoever. Here is what I am using:

• Dell Dimension E521 as well as a Gateway laptop (Both with Vista)
  • Various cables from a brand new mono cable to various stereo cables.
  • When using the Desktop, if I plug the tapped audio into various jacks, I lose all audio. Only my line in option works for not killing the audio.
  • Ive tweaked all of the sound settings eleventeen ways from saturday with no notable improvement noted on any one tweak!
  • Ive used Unitrunker .54, T4Win, New Unitrunker (Which Im confuzzled by even more) trunker, trunkmon. with identical results (Nothing).
  • Ive been given the work arounds that reference the disablemicselect and disablemicfromplayback and those options are not in my registry.
  • There is no option available for input monitor on my sounds.
  • Various control channels in 800/900 provide same results.
  • Also tried inverted and non inverted as well as auto with similar results (inverted is liked more).

I am inserting an image from uniscope that is correlating to a 15-20% decode rate with T4Win but nothing on Unitrunker .54.

Any ideas that anyone can throw out there would be appreciated!

 

[SCPD]

Two options:

1. Insert a buffer amp in between radio and computer. The amp would need to have a high input impedance so as to not load the radio's discriminator.

2. Insert a resistor in series - try 4.7k ohms to 47k ohms. This will reduce the load and also reduce the signal. Your computer's sound input may have enough adjustable gain to compensate.

 

[Robbyboy]

Two options:

1. Insert a buffer amp in between radio and computer. The amp would need to have a high input impedance so as to not load the radio's discriminator.

2. Insert a resistor in series - try 4.7k ohms to 47k ohms. This will reduce the load and also reduce the signal. Your computer's sound input may have enough adjustable gain to compensate.

Im not that technically inclined. What kind of buffer amp? What does one look like?

Thanks

 

[SCPD]

I'm not that technically inclined. What kind of buffer amp? What does one look like?

Here's a one example (although it does not say input impedance). There should be other models like this out there on the 'net with a high impedance input.

Here's a build-it-yourself example.

I forgot a third option. You can purchase an external USB sound module. I've heard good results with the Griffin iMic. Since it is USB and portable, you can take it and the radio with you - and get the same decoding results no matter what hardware you're running.

 

[DaveNF2G]

I forgot a third option. You can purchase an external USB sound module. I've heard good results with the Griffin iMic. Since it is USB and portable, you can take it and the radio with you - and get the same decoding results no matter what hardware you're running.

Side question for Uni T. : Have you heard of the SignaLink interface? It's designed for ham digital modes, but I wonder if it would be helpful with Unitrunker.

 

[SCPD]

Have you heard of the SignaLink interface?

No I had not but looking at the specs, it should work.

Audio Freq Response: 100Hz - 10Khz**
**Upper frequency response is intentionally
limited by Low Pass Filter.

Sampling Size/Rate: 16 Bits, All standard rates are supported up to 48Khz

From the program's perspective, it's just another USB sound port. The only downside is it is about 3 times the cost of a Griffin iMic. Of course, if you already happen to have one in your shack ... you're set.