Quantar flat audio issue

[IjeSJot]

Hi!

Anyone knows how to enable AUX TX input (pin number 5) on Telco 50 pin connector? AUX RX output is working fine and gives flat response audio. Now I am looking for flat input. Any ideas?

Regards, Kamil.

[Bill_G]

I use the wideband input. Don't recall the pin number. I wrote a wildcard table stating "if input 9, key from WB" of something like that.

[xmo]

The wideband input should only be used for simulcast applications because it has no limiter / splatter filter. Motorola's USCI or CSCI provides the proper transmit audio processing to condition TX audio for use with the wideband input.

Using the wideband input for normal transmit audio would have significant probability of interference with adjacent channels and would be contrary to FCC rules.

The simple solution is to turn off transmit pre-emphasis on the channel information screen.

There is also an aux TX input on J17 that can be programmed as a flat audio input or as an input for PL. Using this input will require wildcard programming.

[Bill_G]

Granted, the WB input can be dangerous. But, it is the most linear input. Hopefully people use their test equipment when setting these things up. I'm just saying, you know ...

[IjeSJot]

Thanks for reply. Actually, Pre/Deemphasis is disabled. AUX RX works great and gives flat audio. Wireline L1 input works but it don`t have flat response. MRTI Input also is not flat. How can I enable wideband input? Just need to test it, other inputs don`t have flat response. My Quantar works as a base station, when RX detects PL i enables TRUNK RPT for analog transmisions , when external module detects digital emision (4800baud) via RX AUX, it enables TX via EXT PTT but don`t have wideband input for TX signal...
Quantar got codeplug version 10. Any suggestions?

[Bill_G]

You enable the WB input in the wildcard tables as I showed earlier - INPUT (X), KEY FROM WB. I don't have a specific example in front of me. Perfect for sending modem data over the air (with the caveat xmo explained - it's barefoot and you need to be careful with your settings).

[IjeSJot]

Ok, so I programmed KEY FROM WB at input 1, TX keys but it looks like that wide band input is not active... Any ideas?

[Bill_G]

Someone had a similar problem recently and couldn't get their ext ptt to work correctly.

http://batboard.batlabs.com/viewtopic.p ... 97&start=0

I though wideband input hardware was present on all models of Quantars, but maybe there are versions of firmware that won't let you access it. I've never had a problem using it.

[IjeSJot]

Ok, it was pin number 5? Or maybe 9 or/and 34?

[Bill_G]

I don't have a book in front of me. You'll have to look it up in the backplane section.

[515]

If I remember right, the Quantar had to be programmed as analog-only for the flat audio TX pin to work. If the station was programmed for Astro CAI digital (or possibly mixed mode) operation, the flat audio TX pin wasn't functional.

[ai4ui]

From the manual:

The AUX TX audio is pin 5 on the 50 pin teleco jack. Then there is the note that Stations shipped from the factory are programmed with no signal at Pin 5. Depending on the application, this pin may be programmed for AUXPL Audio or Aux TX audio. In order to program this pin for AUXPL or AUX TX audio, refer to Editing WildCard Tables on Page 7 (actually page 11).

Another note says that the AUX TX Audio signal is an unbalance, 470 ohm impedance input to the station. The input voltage range is -4.1 V to +4.1 V at 250 Hz to 3 kHz, and it shows some response curves that I can't get to show on here.

The notes for WildCard editing are:

Edit WildCard Table 4 in order to route the AUX TX audio signal from J17-Pin 5 to the transmitter. Aligment is fixed so that a 1 kHz tone at -10dBm at the input provides 60% deviation. (for example, on a 25 kHz channel with 5 kHz maximum deviation, a -10dBm input results in 3 kHz deviation.

The table shows (it doesn't show up right):

ACTION: INACTION:
-AUXTX-TX ON -AUXTX-TX OFF
-KEY FROM WL - DEKEY FROM WL

Hope this helps. I have the manual on CD & I will check back here later today to see if I can help more.

[IjeSJot]

Ok guys! It looks like my RSS doesn`t support these functions When I open WildCard tables, in action and inaction I can`t find AUXTX-TX ON... Is it RSS fault? or is it too old firmware? Or maybe I should use DOS RSS?

[xmo]

Your firmware is way too old - approx 1994 - pre-IMBE, pre-wildcard.