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30 ianuarie 2010

OEM GPS inside TM-D710 Front Panel

Acum aproape un an, scriam aici un post despre cum am adaptat un GPS Holux pentru utilizarea pe TM D-710 cu un minim de conectica.
Am cautat un modul convenabil din punct de vedere al dimensiunilor dar si al pretului. Un alt criteriu a fost acela al sensibilitatii de receptie, intrucat antena urma sa fie obturata de capacul de plastic al panoului frontal.
Am achizitionat de la Farnell un GPS Leadtek LR9552, cu antena incorporata. Dimensiunile sunt de 25x25 mm cu o grosime de aproximativ 7 mm!
Am fost impresionat de cat de mic este modulul; practic, antena acestuia este mai mare decat montajul propriu-zis...


Asadar, aveam in cutia cu "maimute" un modul GPS. (De fapt, mai am unul, HI).
Multa vreme am incercat sa gasesc si conectorul mama, corespondent conectorului existent pe modulul GPS. Nu am reusit sa il gasesc iar astazi, am avut ideea salvatoare, asa ca am trecut la fapte!
Am taiat partea de sus a conectorului si am capatat astfel acces la pini, urmand sa lipesc direct pe ei alimentarea si iesirea de semnal NMEA.
Conectorul este foarte mic, astfel incat operatiunea se recomanda celor cu vedere buna si mana sigura.



Pentru lipirea firelor am folosit un letcon de 25W caruia i-am subtiat varful astfel incat sa nu lipesc mai multi pini deodata.
Conform fisei tehnice, modulul GPS are doua iesiri! TxDA si TxDB.


Intrucat nu stiam care dintre ele este cea care furnizeaza semnalul necesar, am lipit pe toti pinii cate un fir. De fapt, nu imi trebuiau si intrarile la modul, dar, pentru ca mi-a iesit prima lipitura, am continuat, asa, din inertie...
Ulterior, dupa identificarea pinului corect, am dezlipit celelalte fire, ca nefiind necesare.
Proba de functionare am facut-o folosind conectorul lateral al panoului de control si o sursa de alimentare exterioara (o baterie 6F22 de 9V si un stabilizator LDO de 5V). Pinul 2 de la GPS este cel care furnizeaza semnalul necesar (TxDA).

Am desfacut panoul capacul panoului frontal si am desfacut saibele de fixare de la potentiometrii de volum/squelch si de la optical encoder.


Cele doua blocuri potentiometrice sunt conectate pe doua bucatele de cablaj si, desi sunt codificate diferit, in realitate sunt identice ca valori si schema electronica, deci nici o grija ca le-ati putea incurca intre ele la montaj.
Pe placa cu componente exista o folie profilata destinata protejarii cablajulu iin zona decupata a capacului din spate. O puteti ridica fara grija, nu este prinsa nici de cablaj si nici de capac. Sub aceasta folie exista un conector flexibil si este bina sa aveti mare grija cu el!



Desfacem cele doua suruburi care fixeaza cablajul de masca si ridicam montajul.
Conectorul de 2,5mm se gaseste in stanga afisajului LCD si se observa ca este vorba de o mufa care are si circuit de autodeconectare.
In figura de mai jos se vede clar pe care dintre pini conectam firul de semnal de la GPS.


Dupa ce lipim firul de semnal de la GPS, asezam cablajul la loc in panou si folosim o degajare in PCB pentru a trece firul in spatele carcasei.
In stanga conectorului RJ45 ce foloseste la conectarea panoului frontal la unitatea centrala observam un regulator LDO. Acesta este regulatorul care furnizeaza 5V montajului.
Intre regulator si conector, pe cablaj este marcat traseul de 10V. Acest marcaj este facut exact pe traseul de GND, unde ne vom conecta cu pinul 1 de la GPS.
Pinul 7, de +5V de la GPS se va lipi direct pe pinul regulatorului LDO.



Dupa lipirea firelor de la GPS, putem face o proba:
Conectam panoul de comanda si pornim statia. In meniul APRS selectam la INPUT: GPS.
Pornim TNC-ul in regim APRS12 si apasam butonul PMON pentru a observa informatiile furnizate de modulul GPS. Dupa aproximativ 2 minute, la mine a inceput sa dea informatiile de pozitie.
Cu ESC ne intoarcem in regimul de afisare a frecventei si apasam POS. Pe afisaj ar trebui sa observam deja coordonatele locului in care ne aflam, inclusiv cu afisarea careului (KN34BK in cazul meu).
In partea din stanga sus a afisajului, va clipi "GPS"; semnificatia este aceea de semnal NMEA coerent.



Oprim statia si deconectam panoul de comanda pentru etapa urmatoare.
Dupa ce am verificat functionarea corecta, eliminam de pe capacul din spate ghidajul destinat unui beeper (nu stiu care era rostul HI). Aplicam o bucata de folie dublu adeziva pe care vom lipi modulul GPS, chiar pe partea cu antena de receptie. Am observat ca nu influenteaza cu nimic performanta receptorului GPS.


Fixam modulul dupa cum se observa din imagine si inchidem capacul de la panoul de comanda.

Din acest moment, avem un TM D-710 cu GPS incorporat in panoul frontal!

Imi cer scuze pentru calitatea imaginilor dar am folosit ce aveam la indemana, adica un telefon mobil.

Mai jos sunt cateva informatii despre modulul GPS folosit:


{Some time ago I made a GPS unit for TM D-710. Now, with a little help from Leadtek, I manage to embedd a GPS OEM unit inside the TM D-710 Control panel! Yes, I just put a GPS inside the "box". }

20-channel, miniaturized single chipset module GPS with integrated ceramic antenna

The Leadtek GPS 9952 module (LR9552) is a high sensitivity and very compact smart antenna module, with built in GPS receiver circuit. This 20-channel global positioning system (GPS) receiver is designed for a wide range of OEM applications and is based on the fast and deep GPS signal search capabilities of SiRFStarIII architecture.

Features:

  • Based on the high performance features of the SiRFstarIII single chip set
  • 20 channels with All-In-View tracking
  • Compact module size for easy integration: 25x25x8.4 mm
  • Fully automatic assembly: reflow solder assembly ready
  • Hardware compatible with SiRF GSW3 v 3. 2.2 software
  • Multiple I/O pins reserved for customizing special user applications
  • Low power consumption: up to 70 mA, and extra high sensitivity: -158dBm
  • RoHS compliance
  • Cold/Warm/Hot Start Time: 4 2 /38/ 1 sec . at open sky and stationary environments.
  • Reacquisition Time: 0.1 second
  • RF Metal Shield for best performance in noisy environments
  • Multi-path Mitigation Hardware
  • RS232 level for GPS communications interface
  • Operating temperature: -20 ℃ to +60
  • Protocol: NMEA-0183/SiRF Binary (default NMEA)
  • Baud Rate: 4800, 19200, or 57600 baud (default 4800)
  • Ideal for high volume mass production (Taping reel package)
  • Cost saving through elimination of RF and board to board digital connectors

TECHNICAL SPECIFICATIONS:

Chipset SiRFstarIII single chipset (GSC 3f )
General Frequency L1, 1575.42 MHz (C/A code 1.023 MHz chip rate)
Channels 20
Sensitivity -159 dBm

Accuracy

Position 10 meters, 2D RMS
5 meters 2D RMS, WAAS corrected
<5meters(50%)>Velocity 0.1 meters/second
Time 1 microsecond synchronized to GPS time
Datum Default WGS-84
Other selectable for other Datum

Time to First Fix (TTFF)
(Open Sky & Stationary Requirements) Reacquisition 0.1 sec., average
Snap start 1 sec., average
Hot start 1 sec., average typical TTFF
Warm start 38 sec., average typical TTFF
Cold start 42 sec., average typical TTFF

Dynamic Conditions

Altitude 18,000 meters (60,000 feet) max.
Velocity 515 meters/second (1000 knots) max.
Acceleration 4g , max.
Jerk 20 meters/second 3, max.

Power

Main power input 5 +- 10% VDC input
Power consumption ≈350 mW (continuous mode)
Supply Current ≈70 mA
Backup Power 1.5 +- 10% VDC input.

Serial Port

Electrical interface Two full duplex serial TTL interface.
Protocol messages NMEA-0183/4800 bps (Default)

Time-1PPS Pulse

Level RS232 or TTL
Pulse duration The 1PPS pulse width is 1 μs, this 1PPS is NOT suited to steer various oscillators (timing receivers, telecommunications system, etc).
Time reference At the pulse positive edge.
Measurement Aligned to GPS second, ? 1 microsecond

Environmental Characteristics

Operating temperature range -20 deg. C to +60 deg. C
Storage temperature range -20 deg. C to +65 deg. C

Physical Characteristics

Length 25 mm
Width 25 mm
Height 8.9 mm (with 4mm antenna)

6.9 mm (with 4mm antenna)
Weight 13.0/8.0g

WARNING!

The Leadtek 9552 OEM GPS comes in two "flavours": RS232 and TTL I/O.
Be sure to choose and order the RS-232 version! They both share the same user manual/leaflet!
Only the RS-232 works with the TM-D710!!!

9 comentarii:

IJsbeer spunea...

I used the same Leadtek GPS module (the TTL kind) discribed in your blog, but it gives no NMEA results to my 710E...
Are you sure you used the TTL type not the RS232 type? There are two types on the market you know, that come with teh same manual.

Greetings from The Netherlands.

Adrian spunea...

I checket the order from Farnell and YES, it is a RS232 Leadtek LR9552!

Sander spunea...

Hi, I am also trying to make this modification. I am not sure if my GPS module outputs TTL or RS232 as it can do both, like yours. I have asked Leadtek for help, I hope they answer. In any case, assuming it's RS232 I connected to the resistor that goes to the max232 (or comparable) level converter so I do not need to remove the PCB.

Can you tell me how to make the D710 show the raw NMEA output like you show in one of your pictures? I can't figure out how to make my D710 do that.

Thanks very much!

73,

Sander W1SOP

Sander spunea...

Hi,

another comment. Turns out my GPS outputs RS-232 (ok!) at 19200 baud (booo!). I'm trying to contact RoyalTek to see if the speed can be changed.

Would still appreciate instructions on how to make the D710 show raw NMEA. Thanks!

73,

Sander W1SOP (CT-USA)

Adrian spunea...

Hi Sander, you can check the RAW input by selecting the proper menu on the D710 front panel. Activate APRS12 or APRS9k6.
Check if GPS Input is also active and push "K" button (the left horizontal) and then you will see P.MON on the down right side of the LCD. Push that button and, voila, you have raw GPS input on the screen.

Sander spunea...

Hi Adrian,

my radio has been at kenwood for a few weeks now. I seem to have blown the display processor (my guess). My radio also had a bad resistor in series with the serial input. You can feed GPS data all day long and never get it fed to the radio that way :)

73,

Sander W1SOP

About YO -WFF spunea...

Oh, sad about!
I was afraid to tell you that this maight be a possible cause! I believe that the uC is OK. I replace a lot of resistors in series with various uC at Yaesu radios. The most recent was a FT857D with no Mic PTT. The same "series resistor"...

About YO -WFF spunea...

Be aware! The "RS232" is not a +/-12 V RS232 signal. The level of the RS232 logic is TTL (5 V or 3,3 V).
So, if you only have a TTL GPS, you need a little logic changer. The 0V stands for a logic "1" and the 3,3V stands for a logic "0". The change can be done with a transistor in common emitter with a pull-up resistor. Take the output from the collector of the transistor.

ggtggg spunea...

Thanks for the inspiration!
http://www.w2dhs.com/2016/07/07/adding-gps-to-a-kenwood-rc-d710-and-possibly-tm-d710/

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