Quantar T1-R2 Setup

[es88]

Would someone be able to shed light on this setup. I'm looking for a Quantar VHF 125W repeater with Antenna relay for T1-R2 setup, T1= 160mHz R1= 155mHz R2=160mHz. The R2 would have its own Rx card and antenna line on the backplane of the station. I have heard of this in the past, my concern is when I place the order for the second receiver. Would this have to have a special firmware to have Wireline total control, R1 priority Rx, R2 lowest priority. Just curious if anybody knows if this is a standard option for the Quantar.

Thanks
ES88

[RKG]

1) I am assuming you are talking about a repeated channel, 160 MHz output and 155 MHz input, and you want the station to be able to hear "direct" transmissions when not actually repeating.

2) The antenna relay is a standard Quantar option. It is intended to be used in simplex stations, to switch the single antenna from receiver to transmitter when the station is keyed (necessarily by wireline, since it is a simplex station as a given). Physically, the relay attaches to a tab on the backplane, and is controlled by a three-pin connector on the backplane. By RSS programming, the relay is made "active" and you specify the desired key-up delay (to give the relay time to pull in).

3) However, you can use the relay function for other purposes, and it will work if the station is programmed as "Repeater" as well as "Station" (though, if you are controlling it externally, you will program it as "Station"). I see no reason why it cannot be used to open the coax connection between a dedicated Rx antenna and the auxilliary receiver, leaving the primary receiver and the transmitter connected (without switch) to a duplexer.

4) I don't understand the query about wireline control of the auxiliary receiver, since that receiver is (without console action) active when the station is not transmitting and inactive when it is transmitting. What else do you want to control?

[es88]

RKG

Thank you for the info, I have been looking in the Quantar manual and reading other related posts. My main fear is that adding the second receiver would only extend the RX bandwith of the Quantar. ex. The quantar would see it as one Rx instead of two. I didn't know if the Quantar needed special firmware to see the receivers as two seperate ones. The query about the Wireline was about priority. I believe wireline always has control over any RX line, and the primary RX would have priority over the secondary receiver. I appreciate the help.....

Thanks

ES88

[xmo]

Exactly what do you want the second receiver to do?

A second receiver in a Quantar is a unique product - not like the old T2-2R stations. The second receiver does not act independently. Which receiver is active is determined by which one is programmed with a frequency in the currently selected channel.

You can use channel scan to allow both receivers to be active and the scan programming has priority capability so that might meet your needs.

[es88]

Xmo

The best way to explain the 2nd RX would be like what RKG stated about the ability to hear direct traffic on the station.

"I am assuming you are talking about a repeated channel, 160 MHz output and 155 MHz input, and you want the station to be able to hear "direct" transmissions when not actually repeating."

I would like to stay away from the scan option if possible. I have seen a MSR do this in the past W/O scan.

Thanks Again

ES88

[RKG]

1) Assuming a 4-wire system, the Tx function of the Quantar is independent of the Rx function -- except that, with an Auxiliary Receiver switched in and out of an antenna (to avoid blowing its brains out when you transmit on the output freq), the 2d receiver is disconnected from its antenna whenever the Q Tx is keyed. However, the main Rx (usually on the input freq) remains active and, depending on how your console is programmed, will pass Rx audio even while the station is transmitting.

Basically, the same with a 2-wire system except that the console is electrically disconnected from any receiver when the station is transmitting.

2) Either way, no manual switching between Rx1 and Rx2 is required. There is a field in the Channel Screen for PTT priority, but for virtually all applications, you can leave this at the default (which is W>R>L>M>D). If your system is voted, all keyups will be W, whether console generated or receiver generated; if your system is in-cabinet, you want the wireline to be able to take key priority away from the receiver but, with a 4-wire installation, a field unit can still barge in and be heard by the dispatcher (and, usually, in the background by field units when it comes over the selected speaker). (I don't believe you can have Rx2 active in a voted system.) However, none of this has to do with switching between receivers.

3) The Auxiliary Receiver is called simply "Rx2" in the Quantar RSS. It is a physically separate receiver, which installs in the cage immediately to the left of the primary receiver (where a SAM card goes if you have one; you can't have both a SAM card and Rx2) and which needs its own antenna (or signal source). In the Hardware Configuration screen, you specify the bandwidth of that receiver. Then, in the Channel Screen, you specify:

a) Tx Freq.
b) Tx Idle Freq.
c) Rx1 Freq
d) Rx2 Freq.

In theory, you could have multiple channels with multiple sets of the foregoing, but this is not typical in most high sites, since channel data has to match duplexer/multicoupler/combiner tuning.

4) The kicker you have to be aware of is "Tx Idle Freq." The exciter of a Quantar is always hot (which is why "squelched" and "receiving" current draws are the same). For a duplex (repeater) channel, the default approach is to set the Tx Idle Freq the same as the Tx freq. This gives the fastest Tx attack time. For a simplex installation, however, you have to "park" the idle exciter someplace else, or it will desense the station receiver -- that is your situation when the station is unkeyed. The help files aren't much use here, but the RSS Programming Manual does. (I don't remember what it is from memory and my books are at a different location right now.)

[es88]

RKG

Excellent I appreciate the help, I will try it out. I will adjust the TX idle also

Thanks Again

ES88

[Dan562]

Hello es88,

This has been accomplished as an Infrastructure SP Option but now sold through Motorola Infrastructure's Marketing as a Standard T1-2R DLNxxxxA Kit (all of the hardware, software and a supplementry manual is included) which can be added to a VHF or UHF T5365A Quantar Base Station / Repeater and a separate T5589A Astro-Tac Receiver that mounts below the Base Station. This option allows the Base / Repeater to function as Simplex Base with the second receiver Wire Line Muting on the Astro-Tac when the F1 Channel Frequency is in the Tx mode and the Repeater always has P1 Priority. The configuration can be accomplished using either a 6 Wire Line or a 4 Wire Line set-up to the Console. The DLNxxxxA Kit Option cost is $1,500.00 and is added to the Quantar in the field by a technician.

Dan

[The Pager Geek]

Hello es88,

This has been accomplished as an Infrastructure SP Option but now sold through Motorola Infrastructure's Marketing as a Standard T1-2R DLNxxxxA Kit (all of the hardware, software and a supplementry manual is included) which can be added to a VHF or UHF T5365A Quantar Base Station / Repeater and a separate T5589A Astro-Tac Receiver that mounts below the Base Station. This option allows the Base / Repeater to function as Simplex Base with the second receiver Wire Line Muting on the Astro-Tac when the F1 Channel Frequency is in the Tx mode and the Repeater always has P1 Priority. The configuration can be accomplished using either a 6 Wire Line or a 4 Wire Line set-up to the Console. The DLNxxxxA Kit Option cost is $1,500.00 and is added to the Quantar in the field by a technician.

Dan

DLN6620A Last I checked.

tpg

[es88]

Great Thank you I appreciate all the help......

ES88