MFJ MFJ-1278 Скачать руководство пользователя страница 9

MFJ-1278 & MFJ-1278T Fast-Start Manual

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5. The  transmit  audio  level  controls  are  located  on  the  left  side  of  the  MFJ-1278.  With  a  small

screw driver turn the transmit control fully counter-clockwise (minimum).

6. Slowly  turn  it  clockwise  (increase)  until  at  a  point  where  output  power  is  slightly  below  the

rated Output of your radio.

7. Type the K key to return to receive mode.

8. Type the Q key to exit the calibration routine.

IV. RECEIVER AUDIO SETTING

With your radio in the receive mode, open the squelch control so that a steady hiss is heard on the
Speaker. Set the volume control to the minimum, then slowly increase it to a point that the MFJ-
1278  tuning  indicator  move  toward  the  middle  of  the  display.  This  is  the  minimum  volume  from
your  receiver  to  allow  the  MFJ-1278  to  copy.  Continue  to  increase  the  volume  control  until  the
audio level is about twice the minimum level.

The DCD Threshold control needs to be set for proper Operation as well. While still listening to un-
squelched  receiver  noise,  rotate  the  DCD  Threshold  control  on  the  MFJ-1278  clockwise  until  the
DCD LED just flickers with false data carrier indications.

Note that DCD Threshold setting may vary for other modes of Operation. Follow the method of set-
ting the DCD Threshold as described in the main instruction manual under each Operation mode.

V. MFJ-1278 2400 PACKET OPERATION

If  your  MFJ-1278  does  not  have  the  2400  modem,  an  optional  modem  (MFJ-2400)  can  be  pur-
chased and installed. Installation is simple; your MFJ-1278 is equipped with all connectors neces-
sary to make this Installation without modification or soldering.

With  the  2400  modem  installed,  your  MFJ-1278  is  capable  of  operating  300,  1200  or  2400  baud
packet. 300 baud and 1200 baud packet are not affected by the Installation of the 2400 modem.

The  addition of the 2400 modem feature will in no way require any internal modification to your
transceiver.

A.

2400 Packet Operation Setup

All default parameters set for 1200 packet operation can be used for the 2400 operation. 2400 op-
eration needs no unusual setup or parameter changes. There are however, some changes that can
be  made  later  to  the  MFJ-1278  parameters  which  will  enable  you  to  improve  the  speed  the
throughput performance of the 2400 operation. The "honing" of the parameters may not seem like
much, but we have found that at 2400, the MFJ-1278 seems to be more responsive to the TXDE-
LAY, DWAIT,  RESPONSE  and  SLOTTIMES.  When  using  direct connects and  good  paths,  the  MAX-
FRAME and PACLEN commands can be increased to allow larger packets to be moved during each
transmission. When returning to the active thru-put frequencies, these two commands should be
reduced to their original settings. You may find that if you were using a TXD of 50, then a TXD of
40 will now perform better. The DWAIT can be shortened or lengthened to suit the AGC recovery
time of your radio. For instance, if you have been running the DWAIT of 16, it may now perform
better at DWAIT of 12 or even 10. The FRACK will appear to exercise more at 2400.

Содержание MFJ-1278

Страница 1: ...our new MFJ 1278 1278T Multi Mode Data Controller between your radio and computer CAUTION Read all Instructions Before Operating Equipment MFJ ENTERPRISES INC P O BOX 494 MISSISSIPPI STATE MS 39762 US...

Страница 2: ...s of the Fast Start manual Your MFJ Starter Pack consists of terminal Software and a serial cable to connect between the MFJ 1278 and your Computer The Starter Packs available are MFJ 1289 for IBM and...

Страница 3: ...8 instruction manual Chapter 2 Computer Interfacing to verify that the cable you are using is cor rectly wired WARNING IMPROPERLY WIRED CABLE COULD DAMAGE YOUR MFJ 1278 AND OR YOUR COM PUTER 1 Connect...

Страница 4: ...your Computer C Radio Interface The first step in connecting the MFJ 1278 is to wire a cable to connect the MFJ 1278 Radio Port to the microphone or accessory connector of the radio The radio cable su...

Страница 5: ...SK Operation this connection can be made thru the use of the TTL connector in the rear panel of the MFJ 1278 Only two lines Pin 8 FSK and Pin 3 ground are needed in making the FSK connection to your r...

Страница 6: ...ad the terminal program and make sure that the terminal program Parameters are set as described earlier 6 Turn on the MFJ 1278 Press the Return key several times in succession MFJ 1278 will sign on wi...

Страница 7: ...e set to operate 1200 baud packet d To enter SSTV mode type MODE TV CR MFJ 1278 will be set to operate SSTV in the 8 5 second format Abbreviation for all the MODEs are as follows MODE VP for VHF packe...

Страница 8: ...controls are located on the left side of the MFJ 1278 With a small screw driver turn the transmit control fully counter clockwise minimum 5 Slowly turn it clockwise increase until no increase in audio...

Страница 9: ...al modem MFJ 2400 can be pur chased and installed Installation is simple your MFJ 1278 is equipped with all connectors neces sary to make this Installation without modification or soldering With the 2...

Страница 10: ...nsmit audio on the 2400 board is set by adjusting R38 next to T2 on the 2400 modem board Transmit audio for the 1278T is preset at the factory to match the audio level of the 1200 modem on the MFJ 127...

Страница 11: ...e display is in the following format Speed Confidence Factor Speed Data Bits RXInvert On Off A typical result will look like this 80 baud 90 Confidence 75 baud 7 bits RXInvert Off After the result is...

Страница 12: ...gnal Note that when using ASA noise will have major effect on the degree effectiveness for ASA V COMMAND UPDATE The following commands have been added since the printing of the MFJ 1278 4th Edition In...

Страница 13: ...es the current PIXtones values When n 1 to 9 TXBRight assumes PIXtones values as follows n PIXtones 0 assumes the current PIXtones values 1 BC 98 A8 88 B0 90 A0 80 2 BA B8 A8 88 B0 90 A0 80 3 B9 BA B8...

Страница 14: ...it appears that the Station you re working is unable to successfully receive your packets despite your adequate signal This failure of some TNCs to receive TXDIDDLEd packets may be a result of some So...

Страница 15: ...this information with the instruction manual of your radio MFJ Enter prises Inc is not responsible for any inaccuracy of the information provided by the diagrams and charts in this instruction manual...

Страница 16: ...MFJ 1278 MFJ 1278T Fast Start Manual 15 B 4 pin Microphone Connector...

Страница 17: ...MFJ 1278 MFJ 1278T Fast Start Manual 16 C Handheld Radio Connectors...

Страница 18: ...MFJ 1278 MFJ 1278T Fast Start Manual 17 D Using the Accessory Jack...

Страница 19: ...pin 8 Tip Lg pin 4 pin 6 7 Sleeves YAESU FT 208 FT x09 FT x3 FT 727 4 pin 8 pin HTs HTs HTs HTs pin 2 pin 8 pin 1 Tip Sm pin 3 pin 6 pin 3 Tip Sm Speaker Speaker pin 2 Tip Lg pin 1 pin 7 pin 4 Sleeve...

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