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Identification of a Motorola Quantar Station By Martin A Flynn W2RWJ

Many of the photos in this article are clickable into larger images. All photos and images were taken by the author unless otherwise noted.

The station is a Motorola Quantar, 125-watt, continuous duty, 132-154 MHz with the optional high-stability oscillator.

Why I purchased a Quantar and not a Ham repeater:

A health-care system was evaluating use of ham radio for backup communications. I had a chance to provide them with a loaner during the evaluation. However, since the site also hosts multiple ambulance, fire, police, and other government systems, interference or interaction would not be tolerated at any level.

A previous user on the site was removed due to interference. Since the site has N+1 power, data, and decent height, I was designing a system that would prove well-behaved and (hopefully) be allowed to stay in place once the trial was over. It does not hurt that the Quantar station is a system of choice for public safety communications.

One thing that sets the Quantar apart from the MSF and MSR stations is that schematics are not readily available. Modules or FRU (Field Replaceable Units) are swapped in the field. This does make it a bit difficult to work on.

Equipment Description:

Near identical unit to my R1 Quantar station. My station also has the X873AA ultra high stability oscillator (UHSO). This model is officially known as a T5365A.

Where To Begin:

The quickest, most non-invasive method of identifying the basic band of a Quantar station is to look at the receiver module on the right side of the card cage. A 700/800/900 MHz station will have no holes. A UHF station will have 5 holes, but only three will have tuning slugs visible. A VHF station will have five holes, with 5 tuning slugs visible.

If the station is in the desired band, the next step is to look at the rear of the unit and read the part number label on the power amplifier module. It is usually visible without removing the module.

There are two different numbers you may encounter - the OEM (Original Equipment Manufacturer) modules used during assembly at the factory and if any modules have been replaced, FRU (Field Replaceable Units). If this is the case, you will see different part numbers, typically with "LN" in the second and third position.

The FRU and OEM units are the same components - one is a repair part, the other is a factory-installed module.

All VHF Range 2 (150-174 MHz) equipment will tune and operate down to approximately 146 MHz.

Power Amplifier Modules:

OEM	FRU	Power	Frequency	Range
TLD3110	TLN3255	25w	132-174	R1/R2
TLD3101	TLN3379	125w	132-154	R1
TLD3202	TLN3254	125w	150-174	R2
TLE2731	TLN3443	25w	403-433	R1
TLE2732	N/A	25w	440-470	R2
CTX1146	DLN1216	110w	380-433	R0
TTE2061	N/A	110w	403-433	R1
TTE2062	TLN3446	110w	440-470	R2
TTE2063	N/A	110w	470-490	R3
TTE2064	TLN3450	110w	490-520	R4
TLF1940	TLN3441	20w	800	N/A
TLF1930	TLN3442	100w	800	N/A
TLF1800	TLN3299	100w	900	N/A

If the number on the PA (power amplifier) is highlighted in red, the next step is to remove the exciter to verify that it has the correct part number for the station. However, on the exciter and receiver modules, the manual references a third part number (CLx) in the "Factory Option Matrix". At least one of these, CLD1260 crosses to the TLN3251 in MOL. However most do not cross in MOL.

Any of the three part number formats could possibly be found on a Quantar exciter module. Most importantly, they all refer to the same component.

Exciter Modules:

OEM	FRU	CLD	Frequency	Range
TLD9831	TLN3252	CLD1270	132-154	R1
TLD9832	TLN3253	CLD1280	150-174	R2
CLX4000	DLN1214	CLX1000	380-433	R0
TLE5971	TLN3305	CLE1230	403-433	R1
TLE5972	TLN3306	CLE1240	440-470	R2
TLE5973	TLN3375	CLE1210	470-490	R3
TLE5974	TLN3376	CLE1220	490-520	R4
TLF6920	TLN3307	CLF1510	800	N/A
TLF6930	TLN3308	CLF1520	900	N/A

Receiver Modules:

Each receiver module is made up of the receiver itself and the preselector. The same part number identification system as the exciter modules applies.

OEM	FRU	CLD	Preselector	Frequency	Range
TRD6361	TLN3250	CLD1250	TFD6511	132-154	R1
TRD6362	TLN3251	CLD1260	TFR6512	150-174	R2
CRX4022	DLN1215	CRX1027	CRX4001	380-433	R0
TRE6281	TLN3313	CLE1190	TLE5991	403-433	R1
TRE6282	TLN3314	CLE1200	TLE5992	440-470	R2
TRE6283	TLN3373	CLE1210	TLE5993	470-490	R3
TRE6284	TLN3374	CLE1220	TLE5993	490-520	R4
TRF6551	TLN3315	CLF1530	N/A	800	N/A
TRF6552	TLN3316	CLF1540	N/A	900	N/A

Module Removal:

CAUTION: Make sure both the AC and DC (if so equipped) power is disconnected from the station before removing or inserting any modules. An ESD strap is recommended as well.

Each module is held in place in the card cage with two T15 Metric Torx screws. On the 100-watt stations, a short coaxial jumper feeds the power amplifier module from the exciter in the adjacent position in the card cage. This needs to be removed prior to removing the exciter or power amplifier. All modules unplug from the backplane as you slide them forward.

Quantar Bonus Items:

The Quantar station may be equipped with several items that make it more attractive for amateur use:

• The CPN1042A power supplies manufactured by Onan have a track record of the filter capacitors failing catastrophically. The CPN1042A power supply has vent holes covering about 80% of the front panel. The current production CPN1048A power supply has vent holes over 40% of the front panel and the cooling fan is visible from the front of the card cage.
• X873AA ultra high stability oscillator (UHSO). It is always positioned between the control module and receiver module. If the station does not have the high stability option, there will be a blank module in the card cage.
• Battery Revert - if the station has battery revert, the DC cord is usually fitted. If the cord is not in place, there will be a card edge connector visible at connector 25 on the rear panel. No connector means no battery revert option. Note: there may be a blank cover (P/N 1582596Y01) over connector 25.
• 4 wire vs. 8 wire control - Josh Heide K6ZRX has an article on adding extra control functions that may be found by clicking here.

Station Programming:

A Quantar station will program on amateur frequencies with the stock Radio Service Software (RSS). Please do not ask me for a copy. The local two-way radio shop programmed my Quantar for a fee.

Reference Material:

• Quantar instruction manual (6881095E05-O)
• Quantar Radio Service Software User's Guide (6881096E10)
• Standards and Guidelines for Communications Sites (6881089E50)

Handy Part Numbers for Accessories:

• Quantar DC Power Cable (TRN5155A)
• Quantar center mount brackets (TTN5028A)
• Quantar local Microphone (HMN1001)
• Quantar local Speaker (HSN1000)
• Quantar RSS (RVN5002)
• Quantar Programming Cable (3080369E31)

Test Equipment Used:

• DA-458/URM Dummy load (Bird 6733)
• Fluke 189 digital multi-meter, 4.5 digit display
• Fluke 199C portable oscilloscope, 200 MHz bandwidth
• Telewave 44A wattmeter, 1 GHz, 500-watt

Acknowledgements:

Doug (AKA Batdude) for his excellent article on BATLABS, which provided a basis for my work.

Larry (AKA Astromodat) and XMO for their identification of the infamous Quantar exploding power supplies.

The staff of www.repeater-builder.com

Contact Information:

The author can be contacted at: his-callsign [ at ] arrl [ dot ] net

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This page originally posted on Wednesday 19-Mar-2009

Article text, photos, artistic layout, and hand-coded HTML © Copyright 2009 by Martin A Flynn W2RWJ.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.