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- How does the SSA324 and SSA424 differ in nulling function?
- A: Edited Reply with thanks to Stan Hubler: For unchanging two wire lines, the SSA324 is solid, stable, and is preferred by many.
The SSA324 is highly recommended if two stations have their speakers ON in the same room. This could and does confuse the SSA424.
The SSA424 is based on a digital hybrid and does not require the same degree of experience to carry out nulling and will auto adjust to changing 2 wire lines. (EG extra cable or beltpacks added). However there are 4 different configurations to be taken into consideration, 2 duplex and 2 semi duplex.
Configuration 1 HALF/Full Duplex (Off/Off/On/Off)
If a director is calling the shots on the four wire input and nobody talks on the two wire, the chip inside adjusts in only one direction.
Sometimes this works perfectly, and sometimes there is an upset in communication while the chip readjusts to a reply on the two wire, or noise, or feedback.
Hi Switched Duplex (Off/Off/Off/Off) The answer to this is to set the unit to position to Configuration 2 This gives you half duplex (with very fast switching) most of the time, and full duplex when conditions are just right.
This actually works very well and most people are unaware of the unit switching.
If the environment is stable, and the front panel gain settings are not too high, Configuration 2 can be used.
This is useful for two way communication where the parties are interrupting each other. This Configuration is less stable than Configuration 1, and can occasionally be fooled, especially if
- the gains are set too high, or
- there is also acoustic leakage between the two parties.
- What do the letters RTS stand for or indeed what does RTS mean?
- RTS has no meaning, it was a logo that the cofounder and his twin had worked out. It was lower case, the r fed into the t fed into the s. On our first meeting, I had suggested some company names (before I heard about the rts business). I was told that it already had a name and it had already been filed with the county. About five years down the line, we thought of possible reverse acronyms/names such as Real Tough Stuff, the Ritz, Really Tops Setup, Rick-Tug-Stan, and so on.
Answer from Stan Hubler - many thanks again Stan!
- I have a PMR 446 Motorola T5422 Walkie Talkie> What is Vox? How does it work?
- VOX is a facility on the road whereby the microphone triggers the radio to start transmitting. This occurs when the output of the mic reaches a certain threshold. Most radios have an adjustable threshold set by the sensitivity level in the menus. The sensitivity needs to be adjusted according to your own voice level and also relative to background noise. (As throat mics do not pick up background noise is irrelevant to this style of mic)! MOTOROLA TALKABOUT VOX The T series Motorolas have generally three settings, 1, 2, & 3 – 3 being the most sensitive. Motorola Talkabouts are made under licence by 1 factory in Hong Kong and are supposed to be compatible between headset accessories, however it as been found the output or "bias voltage" setting at which the mic operates varies between models. Many UK and US models are set differently but even this is only a general rule. The Iasus headsets are set to super sensitive and the radio should be set to its most sensitive = "3". FOR VOX Operation: The headset should first be connected to the radio and the Radio then switched on! Iasus do this test. Count 1,2 3, ...9,10. At normal speed and normal level, too slow and the radio will drop out of Tx The radio should start to transmit at around 1 or 2. It should carry on transmitting for a 1" or so after counting 10! If it drops out of Tx early it may be set internally to a low Open Voltage. If it jumps in and out of Tx you need to adjust the sensitivity setting on the radio or increase your voice level.
- What is the Nulling and Set-up of the SSA 324
- gently with 2mm flat blade tweaker
- Set DUCK pot fully clockwise (CW) (# note Ducking)
- Set all other pots to mid point
- Press channel select IN or OUT to convert desired RTS circuit
- (if not supplied as part of a system)
- Insert the 25 pin D connector into socket J103
- Set 2 Blue switches in OUT position for RTS
- Plug RTS power into 2W in/out sockets
- insert headset
- Adjust Volume pot to ¼ max level
- Press in Test button (# note 1)
- Med Pot to reduce test tone around 1kHz centre frequecy (# note 2) Caution!
- Hi pot to reduce test tone around 300Hz centre frequency
- Lo pot to reduce test tone around 3kHz centre frequency
- Increase Volume Pot to ½ level or more (# note 3)
- Increase Volume Pot To safe listening Level
- Now talk on the intercom circuit to the 4 W output and adjust the "From RTS" level
- Adjust the incoming level , "To RTS" level as required.
Any CHANGES may require further gentle ADJUSTment.
# note 1
If no test tone is heard, this is set inside the unit on a "handbag". W2 = Test tone. W3 = headset mic.
# note 2
The Level and frequency will change.
Take the pot through and back the perceived minimum point to estabilish the best null for each of the Med, Hi and Lo pots.
CAUTION: If the "Med" pot is turned fully ACW there will be no audio on the 4W output.
# note 3
You should only need to make a minor adjustment to the "Med" pot on each of the repeat ADJUSTments
Ducking will mute the quieter of the 4W signals in order to suppress unwanted "sidetone" between the 4W in and 4W out. It should only be used as a final last resort. If not set correctly it will probably result in spurious burbling of audio.
The ducking range is 0db CW to 30dB ACW.
- How do I avoid crosstalk over long runs?
Crosstalk can occur between 2 channels over long runs.
To avoid crosstalk, where possible, avoid STARQUAD cable wired for balanced lines.
The recommended cable is Belden 8723 for long runs. This a twin pair, shielded 22AWG cable. However this cable does not like sun or rain and personally I think expensive!
For more info visit Belden's Website
Alternatives listed here are 88723, 87723 7 82723
The RECOMMENDED WIRING for twin pair and screen cable is
Pin 1 = Screen / one leg of pair / one leg of pair 2
Pin 2 = the other leg of pair 1
Pin 3 = the other leg of pair 2
If you are suffering major problems of crosstalk and you are limited by your cabling one tip is... having identified the line causing the most problem:
- Insert one end of an XLR "Y" chord at the near end (from the PSU)
- Lift pin 3 on one XLR connector and pin 2 on the remaining XLR connector.
- These should now be plugged into 2 separate cables going to the far end.
- Another normal XLR Y chord should now be plugged in at the far end.
- This will recombine the channels into the beltpack... Hopefully minus the xtalk
- How many Beltpacks will the PS15 Power?
- How many BP325 beltpacks will the PS31 Power?
31 without call lights!
25 with call lights.
(~Important: maximum of 20 beltpacks on any one channel)
The common "Rules of Thumb" that reduce capacity are:
- Use of Low impedance headsets
- Long cable runs
- High listen levels
- High talk levels
- The total number call lamps
- No. of Interfaces and accessories that power from the ring
The Maximum sum of all currents of a PS 31 is 1.5A
BP325 Status Current requirement Approx. No. of BP325s excl cable No Signal 27mA x 25 ohm headphones 43mA 34 Average Talk + call light 60mA 25
ALWAYS ALLOW FOR:
- A worst case scenario
- A margin of error
- Extra last minute 'must have' capacity