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1、by means of several rotary knobs or by simply pushing in/out buttons. A clear, but not overly large, orange tinted background liquid crystal display shows frequency, channel number, band display (indicated as four banks of 50 channels and displayed as blocks A, B, C and D). Also available on the mai
2、n display are an standing wave ratio (s.w.r.) function indicator and modulation meter. Away from the display is the rotary mode control allowing the user to switch easily between the c.w., a.m., s.s.b. and n.b.f.m. modes. An RIT function allows the user to adjust the receive frequency 2.3kHz whilst
3、the transmit frequency remains unaffected. This is particularly useful when in a QSO with a station whose transmit frequency doesnt quite match your own. Power output can be varied between 1 and 10W in c.w., a.m. and n.b.f.m. modes only. Useful perhaps when driving a low input power amplifier. There
4、 are the universally recognised volume and squelch rotary controls. The squelch has a useful function referred in the handbook as auto squelch, this basically sets the squelch at a preset level and would I suppose have its uses in a mobile scenario on either the a.m. or n.b.f.m. modes. N ow that sin
5、gle band 28MHz (10 metre) transceivers have been de-regulated and are legal for use in the United Kingdom, the President Lincoln is one of those available for Amateur use. The original prohibition dated back to the late 1980s, when a restriction order was placed on such equipment which also included
6、 the prohibition of converting 27MHz multi-mode radios to the 28MHz Amateur band. Regretably, this latter piece of needless legislation has never been rescinded and unfortunately remains in force, despite the efforts of many Amateurs - including the Editor of PW who has frequently raised this point
7、in his Keylines editorials. However, Ill get off of my own soapbox and on to the review now! The Radio The President Lincoln is a 28MHz multi-mode transceiver, capable of transmitting on the c.w., a.m., s.s.b. (l.s.b. and u.s.b.) and narrow band f.m. (n.b.f.m.) modes between 28 and 29.7MHz. The radi
8、o is clearly aimed at the world-wide CB market, however, in this country its supplied to cover only the 10 metre Amateur band allocation. The manufacturers specification states a transmitter output of 10W on a.m., c.w. and n.b.f.m. and 21W on s.s.b. It comes complete with a noise cancelling micropho
9、ne with up/down frequency selection. Also included are a mobile mounting bracket, power lead, and detailed multilingual instruction book which includes a circuit diagram. The heading picture and the photographs in Fig. 1, and 2 clearly demonstrate how neat the transceiver is inside. Front Panel Lets
10、 look at the all important front panel. There are a host of functions available to the user and all are accessible from the front panel either GLINCOLN REVIEW Keen 10 metre operator Jon Wheeler G0IUE was surprised when he was asked to review the President Lincoln 28MHz transceiver on behalf of PW. H
11、owever he said “I didnt need to be asked twice”! 24Practical Wireless, July 2001 Cost: 225 plus P he was 5 by 8. There was an enormous pile up for him as soon as wed signed so I guess I just timed my call right! Both Kevin and I were in a state of shock after that and once wed picked ourselves up of
12、f the floor, we departed from our vantage point, more than content with the results. No Nonsense! The President Lincoln is a no nonsense transceiver with enough functions to keep most people fully occupied. The lack of repeater shift and memory facilities wasnt too much of a problem to me but may be
13、 to some operators. The front panel is well designed and easy to use. The l.c.d. display is clear and easy to view (I would have preferred it to be slightly larger though). The 9-pin block on the rear panel is clearly unusual for this type of radio and is something you would just have to live with I
14、m afraid. The reports I had on the transmitted audio were very good and the receiver held up well when compared to my FT-920. I didnt try the rig on a.m. or c.w. but you should be able to read how much we enjoyed s.s.b. and n.b.f.m! 26Practical Wireless, July 2001 AFTU E SP C FIC TI era a ne7 s . .m
15、. s s. . n.b f. qu n raen a uo e 6 to 9 7z Re ie l l 2 2 . M z nnn da ce 0 l 3 2 in is ( n mm) 8 25 6 ight: k csr s sul e : Mipho e i up un n c adl cre s a d s d ow r e d. ra smitr qu n de a on 0 z rri we 0 ., . . m. 2 s s. u e z H .m. s s. . . .fm cro e s rre d a ( i l ti n) c i e x n iy . 1dBm a m
16、. n b .) . V 1Bm ( s b ) qu n reon: to 3k z i x ud r: ma e re e c i e ( G Fig. 4: Jon Wheeler G0IUE enjoyed using the President Lincoln 28MHz transciever so much that he bought the review model! (Photograph courtesy of Kevin Romang G4SKN). G Fig. 3: The rear panel - complete with unusual 9-pin socke
17、t (see text for comments). MANUFACTURERS SPECIFICATIONS General Channels:170 Modes: c.w., a.m., s.s.b., n.b.f.m. Frequency rangemanual quotes 26 to 29.7Mz. (Review model only 28 to 29.7MHz) Antenna impedance: 50 Power supply: 13.2V Dimensions (in mm): 185 x 250 x 60 Weight: 2kg Accessories supplied:
18、 Microphone with support, mounting cradle, screws and fused power lead. Transmitter Frequency deviation: 300Hz Carrier power: 10W c.w., a.m., n.b.f.m., 21W s.s.b. Audio response: 300Hz 3kHz a.m., s.s.b., n.b.f.m. Microphone Sensitivity: 6mV Current drain4.5A (with modulation) Receiver Maximum sensitivity: 0 5V 113dBm (a.m./n.b.f.m.) 0.4 V 115dBm (s.s.b.) Frequency response: 300Hz to 3kHz in a.m., s.s.b., n.b.f.m. Maximum audio power: 4W Image rejection rate: 70dB Receiver (with signal) 1A nominal
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