Racal Dana 9921 Manual

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  2. RACAL Ultimate Operation Repair Maintenance Service Manuals & Schematics on DVD; RACAL Ultimate Operation Repair Maintenance Service Manuals & Schematics on DVD. 9921 service manual 9926 9927 Operation & service manual (French version) BCC 34 operation manual.
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An error message is emanating from our beloved Racal Dana 1992 Frequency Counter. It’s a classic but useful piece of test equipment, and we’d hate to see it go.

Racal Dana 9921 Manual

Poring over the service manual, the timing error correction hybrid (TEC) is supposed to have a stop count of 800 +/-220; it’s 850 -all good- but the start count is supposed to be half of that +20/-40; it’s 460, should be 385-445. Reading a little further to see if it can be calibrated elsewhere, the troubleshooting chart says “TEC failure,” nothing more. A little casting about online uncovers the rumour that these are made of “unobtanium”.

Turns out, it’s a red herring. The length of the cable is required to be 30-60cm in length, and in this case it’s far too long at 120cm.

As to the display of Error 54 followed by Error 51, this seems related to RLE, an SPDT relay with a 5V, 500Ω coil.

A Closer View

The relay in question is inside the metal barrier, in the upper right corner, labelled Gentech.

The 500Ω coil is a problem. It’s being driven by a 74LS373, which cannot sink more than 20mA per pin, and all equivalent DIP relays have a 200Ω coil. In this equipment, all logic operates from 5V; 5V/200Ω = 25mA, so the ‘LS373 will run out of spec, and certainly fail. A DIP SPDT 1-form-C reed relay with 500Ω coil is a mythical beast at this point. Possible solutions are:

1. Use a modern dip relay with 200Ω coil, but lift the coil leads up, and put an open-collector PNP transistor on it so the LS373 can just sink the transistor base current. This is messy, and will have jumper wires on the board, plus a forest of parts glued onto the relay; but, it will have the signal path going through the reed relay pins on the pcb, as originally designed.

2. Use a telecom relay with a 500Ω coil, flip it upside down and hand wire it into the RLE site. This option is more attractive as it involves less fiddly soldering and a more easily replaced item; not to mention reed relays suck anyway, they’re notoriously cheap and failure prone.

A brief digression… since the relay controls switching in/out the filter for low-frequency noisy signals, and I’ve never used it, I removed the relay, hard-wired the non-filtered path and reassembled the unit. I ran the counter hooked up to a Rubidium reference over-night, and tuned the counter to +/-0.02Hz. The manual says the temperature must be 23°C +/-2°C; it’s 23°C, so conditions are just about perfect. So, though not calibrated with a traceable certificate, I trust it.

Back to the issue at hand, snooping around reveals a nice little telco relay available from Digi-Key, DPDT 2-Form-C _and_ in its uber-sensitive coil flavour, a 500Ω coil!

Relays, Old and New.

From left to right, the original relay, the telco (non-reed) relay, and a modern equivalent of the original, unusable due to its 200Ω coil.

A little double-sided foam tape creates a dead-bug style of mount.

One more thing: the telco relay does not include an anti-kick-back diode, but the original reed relay does. This needs to be added prior to installation. Here’s a shot of the mod in progress:

The diode across the coil prevents inductive spikes from wrecking the driving circuit.


Here it is mounted in place. I think the next time this happens (next time?) I’ll rotate the relay 90° counter-clockwise; it would have made the wiring a little cleaner. In any case there you have it: one telco relay, capable of handling much higher current, same coil resistance as the original reed relay, able to be driven by old-school TTL logic devices like the 74LS373.

Most importantly, it works! Above, it’s showing the correct display during a test with the 10MHz reference connected to the counter A input. The frequency counter is back in operation; after testing with a function generator, I can see that the filter is being properly switched in and out of the circuit.

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Seller: legrandexplorateur(10,461)99.9%, Location:Quebec, QC, Ships to: Worldwide, Item:122038796322ULTIMATE RACAL, RACAL INSTRUMENTS, RACAL-DANA, OPERATION, REPAIR & SERVICE MANUALS ON DVD This DVD contents more than 300 Original RACAL PDFs operation, service manuals and schematics files for a lots of RACAL products . Perfect for all repair/service shop or RACAL users that want to have a lot of RACAL OPERATION & SERVICE MANUALS. You will never find more RACAL PDF Original manuals for this low price! With these service manuals and schematics, you can easily find the problem if you have little electronic knowledge. Don't buy 'one' manual at 5-10$ if you can have more than 300 Originals RACAL Operation, Service repair Manuals and schematics with Worldwide FREE shipping! Since these are very old manuals, I take pride to give you the best quality schematics, this is why some manuals scans may be listed more than once, but they are never the same file! Scan contrast or resolutions are always different for a duplicate manual version. Some of these manuals are not very good scans, hopefully though, they will surely help you enough to operate or service your equipment. This DVD ( PC and Mac) compatible contents more than 300 PDF files (Adobe Reader XI)!!!. The files are not compressed to save on DVD cost! You will see all the files as you open it in your PC or Mac computer! All the files are listed by models, so very easy to find the critical information! You will always have all the informations of your gear with you to give to your repair shop! A TRUE 'MUST HAVE'!!! FREE SHIPPING ALL OVER THE WORLD! Note: Shipping time is about 2-6 weeks in average all around the world by regular air postal service. All files are in PDF Adobe Reader XI version (that can be easily downloaded free on the web) FOR CANADIAN BUYERS ONLY: SALES TAXES (GST, PST, HST) will be added in the Ebay final invoice. No Sales Taxes for USA and International buyers. If you need 1 or 2 service manuals file to beging a fast repair or If you need specific manuals not on the list below, just send me a message and I will be pleased to help you ! Need all those files fast by email? No problem, just send me a message when you will buy. In this case, a dropbox download link will be send (1.6GB), but no DVD will be shipped by mail LIST OF MANUALS INCLUDED: 409 Operation & service manual 488 Operation manual 836 service manual 836 service manual (incomplete schematics) 852 service manual 1250 Operation manual 1256 Operation manual 1256E Operation manual 1257 Operation manual 1258 Operation manual 1260 VXI 1260-35 operation & service manual 1260 Series Instruction manual 1990 Operation manual 1990 Service manual 1991 1992 User Manual 1991 1992 Service manual 1994 Operation & Service manual 1998 1999 Operation manual 1998 1999 Service manual 2051 operation manual 2101 Operation Manual 2101 service Manual 2151 operation manual 2201 Operation manual 2201 service manual 2202R User Manual 5002 operation & service manual 5005 service manual 5006 service manual 5900 Operation manual 6000 operation & service manual 7071 service manual 7081 service manual 9000 Operation & Service manual 9008 service manual 9008M Operation manual 9009 service manual 9024 Operation & service manual 9036 service manual (incomplete schematics) 9037 service manual (incomplete schematics) 9038 service manual (incomplete schematics) 9081 9082 service manual 9083 service manual 9087 Operation manual 9087 service manual 9300 Operation manual 9300 service manual 9300F service manual (French version) 9301A service manual 9303 service manual 9303 Operation manual 9341 maintenance manual 9343M Operation manual 9386 Operation & service manual 9475 operation manual 9478 service manual 9480 Maintenance Manual 9480 User Manual 9613P operation manual 9835 service manual 9836 service manual 9901 service manual 9901 user manual 9902 operation manual 9904 Maintenance Manual 9904 Operators Handbook 9905 user manual 9906 operation manual 9911 Operation manual 9911 service manual 9913 Operation manual 9913 service manual 9918 service manual 9921 service manual 9926 9927 Operation & service manual (French version) BCC 34 operation manual BCC 39A service manual BCC 39B service manual (no schematics) BCC 66 vol.1H technical manual DA78120 B Operation Manual MA-168B Operation & service manual MA-259 operation & service manual MA-925 schematics MA-930 schematics MA-949 service manual MA-1004 operation & service manual MA-1034 operation & service manual MA-1720 operation & service manual MA-1723 operation & service manual MPS1222 operation manual PRC-320 user manual PRM 4700A Technical Manual PRM-4700A Operating Instructions RA-17L operation & service manual RA-66 operation & service manual RA-98 operation & service manual RA-117 operation & service manual RA-121A 121B operation & service manual RA-137b operation & service manual RA-217 Maintenance Manual Vol.2 RA-222 A1 operation & service manual RA-337 operation & service manual RA-366 operation & service manual RA-1217 operation manual vol.1 RA-1217 service manual RA-1218 Maintenance Manual Vol.2 RA-1771 1772 maintenance manual RA-1771 1772 operation manual RA-1778 Operation Manual RA-1778 service Manual RA-1792 Maintenance Manual RA-1792 partial operation manual RA-1794A technical manual (no schematics) RA-3790 Series Operators Manual RA-6217 6217A Operation & service manual RA-6336 Operation & service manual RA-6337 Operation & service manualRA-6790 6790GM alignment manual RA-6790 6790GM operation & service manual RA-6793A operation & service manual RA-7915 service manual RS-6504A 6504B Operation & service manual SA-535 Operation & service manual Syncal 30 Technical Manual TA-940B Operation & service manual TA-944 operation & service manual TA-1810 operation manual TA-1813 operation & service manual TA-1816 operation manual TA-1823 service manual TRA-906 operation & service manual TRA-921 technical manual TRA-931X TRA-31Y Technical Manual TRA-7928 operation & service manual TRA-7938A TRA-7938C operation & service manual TRA-7948A operation & service manual TTA-1870 transmitter terminal unit wiring diagram TTA-1885A terminal unit wiring diagram TTA-1885A operation & service manual TTA-1885A operation manual VA811 installation & operation manual VA2440 VA2445 P S G X operation manual Also included Racal VXI modules operations manuals: 1260-00c, 1260-1XXX-Y, 1260-12, 1260-13, 1260-14, 1260-14-C, 1260-16, 1260-16A, 1260-17, 1260-18, 1260-20, 1260-21, 1260-22, 1260-22-S-1639, 1260-23, 1260-30, 1260-35, 1260-36, 1260-37, 1260-38, 1260-38T, 1260-39, 1260-40, 1260-43, 1260-45, 1260-50AB, 1260-50CD, 1260-51, 1260-54, 1260-58, 1260-59, 1260-60, 1260-64, 1260-64M, 1260-66, 1260-67, 1260-67M, 1260-75, 1260-82, 1260-84, 1260-88, 1260-93, 1260-100, 1260-10X, 1260-101, 1260-111, 1260-112, 1260-114, 1260-115, 1260-6, 1260-117, 1260-118, 1260-120, 1260-121, 1260-131, 1260-132, 1260-134, 1260-136, 1260-138A, 1260-145, 1260-150, 1260-152, 1260-152HV, 1260-155, 1260-160BE, 1260-162, 1260-164, 1260-167, 1260-172, 1260-172HV, 1260-700, 1260-822, 1260A Opt 01T, 1260-X121, 1260-X133, 1260-X138, 1260-X153, 1261B, 1261B linear, 1264C, 1266, 1268-001, 1461-14, 2165, 2251A, 2460, 2461C, 2583, 3151-A, 3152, 3152A, 3153, 3155, 3156B, 3161, 3162AB, 3165, 3171, 3271, 3352, 4072, 4072A, 4073, 4152A, 5601, 6062, 6075, 6088, 7064M, 7064R, 7064R-S-1843, 7064R-S-1844, 9215 IMPORTANT: THESE SERVICE FILES ARE FOR YOUR REFERENCE ONLY. ELABORATE SERVICE REPAIR SHOULD BE MADE BY CERTIFIED SERVICE CENTER. The price is not for the manuals themselves but is for the labor cost involved in transferring them to disc, the re-sale price of the blank disc used to make the recording, Ebay and Paypal listing fees, the labor and shipping cost involve, therefore permissible under the 'Fair Use' exemption clause of the current U.S. Copyright Act.Condition:Brand New

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