Larsen Electronics Offers Full Line Of Antennas For Handheld Radios

Larsen Electronics, Inc., of Vancouver, Washington, has developed a full line of Kulduckie antennas to mate with all the most commonly used hand-held radios.

Larsen offers eight helical type Kulduckie models which operate on low, high, and UHF band frequencies (136-174 MHz, 406 420 MHz, and 450-512 MHz), Eight quarter-wave models are also available to operate in the 406-420 and 450-512 MHz bands, They are all color coded by frequency for easy identification.

Larsen's Kuiduckie antennas mate with Motorola, GE, RCA, REPGCX and many other popular hand-held models.

They are ruggedly constructed to take the rough usage common to this type of antenna. VHF and UHF models are spring-wound for flexibility and plated with high conductivity material for Larsen's maximum radiation efficiency.

They are also all-weather-protected by a tough heavy-duty coating of an exclusive step design which prevents detuning from shorting and adds flexibility. They handle a full 25 Watts and are flexible enough to bend 180 degrees in all directions.

For more information, write Larsen Electronics, lnc,t PO Box 1686, Vancouver WA 98663i Reader Service number 480.

The PA 1-10 from THS;

Larsen Kulduckie KD-4 antenna. 168 73 Magazine * June, 1980



Xitex Corporation has just announced the addition of the UDT-170 (Universal Data Transceiver) to its data products line for RTTY and Morse operation. The UDT-170 connects directly between the user's ASCII or Baudot Teletype' or video terminal and the station transceiver. For the user who does not currently have a teletype or video terminal, the Xitex SKT-100 video terminal is recommended.

The UDT-170 is actually the combination of a microprocessor-based data converter plus a high performance RTTY terminal unit (TU). tn the receive mode, the TU takes the RTTY or Morse signal from the receiver audio output and converts it to a dc signal which is fed to the data converter portion of the

UDT-170. Here, two single-chip microcomputers are used to convert the ASCI l/Baudot/Morse input signal into an RS 232 or 60-milliamp output signal which has been regenerated to match the mode (ASCII or Baudot), baud rate, and line length of the user's terminal.

In the transmit mode, the serial output signal from the keyboard on the user's terminal is fed into the data converter in the UDT-170 where it is continuously buffered and regenerated in the desired output mode (ASCII, Baudot, or Morse) and data rate.

The UDT-170 will operate at any FSK shift from less than 100 Hz to over 10OQ Hz, Baudot rates of 60, 67,75, and 100 wpm, ASCII rates of 110 or 300 baud, Morse rates from 1 to 150 wpm with "Auto Track," and line lengths from 40 to 80 characters. Other

The UDT-170

features include a 2-digit LED display for The copy wpm rate (Morse only) and buffer states, and an optional CW "indent" feature for RTTY operation.

The UDT-170 is packaged in an RFI-protected metal enclosure measuring 12" x 7Y<r x from Xitex.

3Vz" and operates on either 115 or 230 V ac, 50/60 Hz, For additional information, contact Xitex Corporation, 9861 Chart well Dr Oaf fas TX 75243; (214)349-2490. Dealer inquiries and overseas orders welcome. Reader Service number 478.

Looking L4/est from page 10

formed ARC Security employee told me,

"But when t returned to the same checkpoint after seeing my wife onto her plane, I asked the supervising guard under what authority the demand had been made. The supervisor, an ARC sergeant, toned the 'demand' down to a request/ which he claimed is routinely made on behalf of the airlines which contract for ARCs services at the Atlanta airport,

"Contacted by mailt Delta Air Lines (the largest carrier headquartered in Atlanta) confirmed that even such a request' has no legal basis. Wayne G. Reel, director of Delta's Atlanta station, wrote that 'ARC Security, incorporated, employees have been advised that there are no iaws or statutes presently in force that prevent radio communication on our concourses/

"ARC management, in a telephone interview, acknowledged that their employees had made errors in the incident both by demanding that the handie-talkie be disabled and in claiming that amateur communications were prohibited beyond the checkpoints. lOur officers make millions of judgment calls every month/ said Tom Cleary, regional manager for ARC Security. They must assure themselves that any item carried past the checkpoints is okay. Radios are okay. The guard only had to assure himself it was a radio.'

"Cleary said that ARC checkpoint guards do not receive explicit instructions on how to ascertain that a radio is just that and not a bomb or gun. Every guard asked to pass a radio through a checkpoint makes a decision based on his or her own knowledge and experience. If a guard is uncertain about an item, he will ask the owner to wait and defer the judgment to a supervising guard, an airline employee, or law enforcement personnel/ In the deadly serious business of searching for harmful items in American airports, such double checks are agree^ ably endured by most people.

The ARC executive confirmed that the contracted security guards have no authority to detain anyone. That authority is limited to law enforcement personnel with legal cause. ARC employees can and occasionally do escort persons with suspicious or unusual hand baggage to the gate areas to report that baggage to airline employees or flight crews. Such a report might be made if a security guard believed a traveler intended to use a radio on board an airliner without proper permission. Such use is banned/'

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