View source for Uruguay ← Uruguay

{{Country
|name=URUGUAY
|mcc=748
|coordinators=CX2AL, CX8BIT, CX4AR,CX4AE
|image=UruguayFlag02.png
}}
<br>
=WELCOME TO THE  URUGUAY'S  WiKi PAGE=

----
= Last heard on TGs 748 and 7487 =
<br>
https://brandmeister.network/index.php?page=lh&country=748

https://brandmeister.network/index.php?page=lh&DestinationID=7487



<br>

=Digital contacts list=

* [http://www.dmrcontacts.com Digital contacts list by CX8BIT]

For the moment, this page contains lists only for the Anytone AT-D868UV/AT-D878UV  and Alinco DJ-MD5TGP,/ DJ-MD5T radios.
Guillermo, CX8BIT, will continue to add lists for other radios.
<br>
<br>



=TG's in Uruguay's departments=
<br>
<br>
[[File:MapaUYconTGs01S.jpg]]

<br>
<br>

=BM News=
[https://news.brandmeister.network/ News]
<br>
<br>
<br>
<br>

= Talk Groups in URUGUAY =
<br>
In Uruguay, '''there are no restrictions on TG's use'''. Repeaters, mobile and handheld radios, DMO's, etc., are open to all TG's on any slot.
There are, however, some '''conventions''' for the use of TG's and for the programming of handies or mobile stations.
<br>
These are the following:
*1-'''Repeaters'''
<br>
*a) National TG 748 is programmed as permanent on slot 1. It is meant as a calling channel, for establishing the initial contact and facilitate QSY to a regional or user activated talk group (CXUA's). Please remember that QSO's on TG 748 block time slot 1 on almost all CX repeaters.
*b) Emergency TG, 74800, is programmed as '''permanent on both slots'''.
*c) It is suggested that the TG corresponding to the department's TG be programmed on slot 2 as permanent.
<br>
*2-'''Handies and mobile radios'''.
<br>
*-These are programmed with TG 74800 in the Rx list of '''all channels'''. No Rx list should be programmed selecting the "none" or "no Rx list" options in the programming software.  This allows the emergency TG 74800 to allways be heard.
<br>
*3-'''Hotspots and DMO gateways'''.
<br>
*-74800 is programmed as permanent in whatever slot the hotspot or DMO uses.
*- It is suggested that the TG corresponding to the department's TG be programmed on the used slot(1 or 2) as permanent.
<br>

=Talk Groups on Time Slot 1 =
<br>

* '''748''' - '''Uruguay national (permanent on most CX repeaters)'''

* '''74800''' - '''Emergency'''


*[http://brandmeister-907-jota-joti-yota.cloudaccess.host 748907 and 748918 JOTA/JOTI (call channels)]
*The setting as permanent  for the JOTA TG's is upon request to the repeater's Sysop.





<br>

= Talk Groups on Time Slot 2 =

* [[9 Local]]

* '''[[74800 EMERGENCY]]'''
* [[Departamento de Artigas|74803 Artigas]]
* [[Departamento de Canelones|74804  Canelones]]
* [[Departamento de Cerro Largo|74805  Cerro Largo]]
* [[Departamento de Colonia|74806  Colonia]]
* [[Departamento de Durazno|74807  Durazno]]
* [[Departamento de Flores|74808  Flores]]
* [[Departamento de Florida|74809  Florida]]
* [[Departamento de Lavalleja|74810  Lavalleja]]
* [[Departamento de Maldonado|74811  Maldonado]]
* [[Departamento de Montevideo|74801  Montevideo]]
* [[Departamento de Montevideo|74802  Montevideo]]
* [[Departamento de Paysandú|74812  Paysandú]]
* [[Departamento de Rio Negro|74813  Rio Negro]]
* [[Departamento de Rivera|74814  Rivera]]
* [[Departamento de Rocha|74815  Rocha]]
* [[Departamento de Salto|74816  Salto]]
* [[Departamento de San José|74817  San José]]
* [[Departamento de Soriano|74818  Soriano]]
* [[Departamento de Tacuarembó|74819  Tacuarembó]]
* [[Departamento de Treinta y Tres|74820  Treinta y Tres]]
<br>
*[http://gx4crc.com/gb4imd 748230 Marconi Activities (IMD, etc.)]

<br>
*[http://www.uruguay-link.com 7487 - Link Wires-x Room #60820, YSF #51380, XLX117D, Peanut, Europelink Room #98  ]

<br>

=Clusters=
<br>
*A Cluster is a special TG (TG8, for instance) that makes a group of repeaters to act as a single repeater, where you can talk only locally, as you would on a  repeater on TG9. This TG, as TG9, cannot be reached from another repeater that is not included in the cluster. No Clusters exist as yet in Uruguay.
<br>

= User-activated (Tactical) Uruguay Talk Groups on Time Slot 2 =
<br>
User-activated talk groups, also known as "tactical", "dynamic" or "on demand"  talk groups, are activated by pressing PTT once. The talk group will stay active (on the repeater it has been activated) for 10 minutes after the last activation. In Uruguay users  "meet" on national or regional talk groups (e.g., TG 748,TS1) and will then agree to switch to one of the user-activated talk groups (TGs 74830, 74840, 74850, 74860). Since user-activated talk groups are used on time slot 2, this operating procedure frees up resources on time slot 1 for  other users. 

{| 
|- 
  ! width=5% style=" border:1px light gray;"|Talkgroup
  ! width=5% style=" border:1px light gray;"|Timeslot
  ! width=90% style=" border:1px light gray;"|Description
|-
  |74830
  |2
  |CXUA 1
|-
  |74840
  |2
  |CXUA 2
|-
  |74850
  |2
  |CXUA 3
|-
  |74860
  |2
  |CXUA 4
|-
 
|}
<br>

= Applications =
[https://wiki.brandmeister.network/index.php/Applications All Applications]
<br>
==='''GPS'''===





- CAI Network: 12<br>

- ARS Radio ID:  XXX999 , XXX being the first three digits of any Master Server. <br>
(This server does not necessarily need to be the Master Server to which the repeater is connected)<br>


- ''preferred channel settings'':<br>

- ARS: On System/Site Change<br>

- IP Site Connect: On<br>

- GPS Revert: Selected<br>

- Data Call Confirmed: Off (unchecked)<br>

<br>

=== '''PARROT''' ===
* 9990 Parrot (Private call and TS2)
<br>

= Useful Links =


* [http://uruguay-link.com/ Uruguay-Link]
* [http://brandmeister.network BrandMeister Dashboard]
*[https://www.brandmeister.es/servicios-digitales-de-brandmeister Servicios digitales en BrandMeister]

* [http://brandmeister.network/index.php?page=lh Lastheard]
* [https://brandmeister.network/?page=lh&jsonquery=%7B%22condition%22%3A%22OR%22%2C%22rules%22%3A%5B%7B%22id%22%3A%22ContextID%22%2C%22field%22%3A%22ContextID%22%2C%22type%22%3A%22string%22%2C%22input%22%3A%22text%22%2C%22operator%22%3A%22equal%22%2C%22value%22%3A%22748103%22%7D%2C%7B%22id%22%3A%22DestinationID%22%2C%22field%22%3A%22DestinationID%22%2C%22type%22%3A%22integer%22%2C%22input%22%3A%22text%22%2C%22operator%22%3A%22equal%22%2C%22value%22%3A%22748%22%7D%2C%7B%22id%22%3A%22DestinationID%22%2C%22field%22%3A%22DestinationID%22%2C%22type%22%3A%22integer%22%2C%22input%22%3A%22text%22%2C%22operator%22%3A%22equal%22%2C%22value%22%3A%227481%22%7D%2C%7B%22id%22%3A%22DestinationID%22%2C%22field%22%3A%22DestinationID%22%2C%22type%22%3A%22integer%22%2C%22input%22%3A%22text%22%2C%22operator%22%3A%22equal%22%2C%22value%22%3A%2274811%22%7D%5D%7D Last heard Uruguay]

* [http://brandmeister.network/index.php?page=lh&country=748 BrandMeister Dashboard for Uruguay]
* [http://ham-digital.org/dmr-userreg.php?callsign=cx* List of CX registered callsigns]
*[http://www.repeater-builder.com/products/stm32-dvm.html  Zimmermann's MMDVM board]
*[http://hamradio.joomla.com/images/PDF/Hotspot-Users-BER-rate.pdf BER/Hotspots]
*[https://wiki.brandmeister.network/index.php/Server_Configuration BrandMeister supported protocols]
*[http://wiki.bm262.de/doku.php?id=servicenummer#gps_und_wetter/ WX and other sms commands shown in the BM German site(262)]
*[https://wiki.brandmeister.network/index.php/Kirisun_Repeater Kirisun Repeater setup]
<br>

=Repeaters=
{| 
|- 
  ! width=5% style=" border:1px light gray;"|Callsign
  ! width=5% style=" border:1px light gray;"|ID
  ! width=8% style=" border:1px light gray;"|Tx freq.
  ! width=8% style=" border:1px light gray;"|Rx freq.
 ! width=10% style=" border:1px light gray;"|Permanent TGs S1
 ! width=10% style=" border:1px light gray;"|Permanent TGs S2
 ! width=10% style=" border:1px light gray;"|Location
 ! width=20% style=" border:1px light gray;"|Remarks
<br>
|-
|[https://brandmeister.network/?page=repeater&id=748001 CX2CXX]
|748001
|147.360
|147.960
|748
|74800
|Montevideo-Pocitos
|Temporarily down
|-
|[https://brandmeister.network/?page=repeater&id=748002 CX8RXX]
|748002
| 
| 
| 
| 
| Maldonado
|Not yet in service
|-
|[https://brandmeister.network/?page=repeater&id=748003 CX1AXX]
|748003
|146.760
|146.160
|748 
|74800,74801,74802,7487
|Montevideo - (Sede R.C.U)
|RCU-temporarily down
|-
|[https://brandmeister.network/?page=repeater&id=748004 CX8CXX]
|748004
|145.500
|144.900
|748
|74800,74801,74802,748230
|Montevideo - Unión
|RADIOGRUPO SUR
|-
|[https://brandmeister.network/?page=repeater&id=748005 CX9SXX]
|748005
|432.425
|437.425
|748
|74800,74810
|Lavalleja - MINAS
|RADIO CLUB MINAS - CX2AL

|-
  |[https://brandmeister.network/?page=repeater&id=748011 CX1DXX]
|748011
|432.500
|437.500
|748
|74800,74804,748230
|Canelones - Joanicó
|RADIOGRUPO SUR
|-
|[https://brandmeister.network/?page=repeater&id=748012 CX9TXX]
|748012
|432.500
|437.500
|748
|74800,74815,748230 
|Rocha - (Sede de C.R.R - C.A.R)
|RADIOGRUPO SUR - CENTRO RADIOAFICIONADOS ROCHA -
CIRCULO ATLANTICO
|-
|[https://brandmeister.network/?page=repeater&id=748013 CX4UXX]
|748013
|432.200
|437.200
|748
|74800,74820
|Treinta y Tres - Ruta 8 Km 323.700
|CX4AR
|-
|[https://brandmeister.network/?page=repeater&id=748014 CX2TXX]
|748014
|
| 
| 
| 
| Rocha
|
|-
|[https://brandmeister.network/?page=repeater&id=748015 CX7DXX]
|748015
|432.825
|437.825
|748
|74800,74804,748230 
|Canelones - Solymar
|RADIOGRUPO SUR

|-
|[https://brandmeister.network/?page=repeater&id=748101 CX4AXX]
|748101
|432.100 
|437.100 
|748,74800
|74800,74801,74802,7487
|Montevideo - Pocitos
|CX2AL
|-
|[https://brandmeister.network/?page=repeater&id=748102 CX7BXX]
|748102
|432.350
|437.350
|722,730,914,
7221,7227,7301
|7487,74800,74801,
74802,74803,74804,
74805,74806,74807,
74808,74809,74810,
74811,74812,74813,
74814,74815,74816,
74817,74818,74819,
74820,74830,748008,
748102
|Montevideo - Paso de la Arena
|CX5AL - CX4AE
|-
|[https://brandmeister.network/?page=repeater&id=748103 CX4RXX]
|748103
|432.300
|437.300
|748
|74800,74811,7226
|Maldonado - Punta del Este
|CX4AR
|-
|[https://brandmeister.network/?page=repeater&id=748104 CX9BXX]
|748104
|432.150 
|437.150
|748
|74800,74801,74802,748230 
|Montevideo - Cordón
|RADIOGRUPO SUR
|-
|[https://brandmeister.network/?page=repeater&id=748106 CX7RXX]
|748106
|432.750
|437.750
|748
|74800,74811
|Maldonado - Piriapolis
|CX4AR - CX3BBL - HB9IBG
|-
|[https://brandmeister.network/?page=repeater&id=748107 CX8DXX]
|748107
|432.550
|437.550
|748
|74800,74804,748230
|Canelones - Las Piedras
|RADIOGRUPO SUR
|- 
|[https://brandmeister.network/?page=repeater&id=748107 CX4VXX]
|748017
|432.350
|437.350
|748, 74800
|7487, 74800,74805,
|Melo-Cerro Largo
|CX4AE, CX3VB
|-

|[https://brandmeister.network/?page=repeater&id=748018 CX4EXX]
|748018
|146.700
|146.100
|74800,
|74800,
|Libertad - San José
|Uruguay Link
|-
|[https://brandmeister.network/?page=repeater&id=748006 CX9DXX]
|748006
|
|
|
|
|
|Projected
|-
|[https://brandmeister.network/?page=repeater&id=748007 CX8TXX]
|748007
|
|
|
|
|
|Projected
|-
|[https://brandmeister.network/?page=repeater&id=748008 CX3IXX]
|748008
|
|
|
|
|
|Projected
|-

|[https://brandmeister.network/?page=repeater&id=748009 CX4TXX]
|748009
|432.850
|437.850
|74800
|74800
|La Paloma-Rocha



|Uruguay-Link, Centro de Radioaficionados de Rocha
|-
|[https://brandmeister.network/?page=repeater&id=748019 CX8JXX]
|748019
|147.090
|147.690
|74800
|74800
|Salto
|Uruguay Link
|-
|[https://brandmeister.network/?page=repeater&id=748016 CX4CXX]
|748016
|432.450
|437.450
|74800
|74800
|
|Uruguay Link


|}

=DMO Gateways (high power hotspots)=
<br>

{| 
|- 
  ! width=5% style=" border:1px light gray;"|Callsign
  ! width=5% style=" border:1px light gr ay;"|ID
 ! width=10% style=" border:1px light gray;"|Frequency
 ! width=10% style=" border:1px light gray;"|Location
 ! width=10% style=" border:1px light gray;"|Remarks
|-
  |[https://brandmeister.network/?page=repeater&id=7480021 CX8BIT]
  |7480021
  |147.990
|Montevideo
|
|-
  |[https://brandmeister.network/?page=repeater&id=7480017 CX2TG]
  |7480017
  |146.598
|Rocha
|
|-
  |[https://brandmeister.network/?page=repeater&id=7480045 CX2UI]
  |7480045
  |145.050
|Treinta y Tres
|
|-
  |[https://brandmeister.network/?page=repeater&id=7480023 CX3AF]
  |7480023
  |433.050
|Paysandú
|
|-
 |[https://brandmeister.network/?page=repeater&id=7480019 CX1LA]
|7480019
|145.550
|Casupá-Florida
|
|-
  |[https://brandmeister.network/?page=repeater&id=7480095 CX2FX]
  |7480095
  |146.460
|Tarariras-Colonia
|
|-
  |[https://brandmeister.network/?page=repeater&id=7481017 CX2DAJ]
  |7481017
  |146.080
|Santa Lucía-Canelones
|
|-
  |[https://brandmeister.network/?page=repeater&id=7480132 CX2TN]
  |7480132
  |146.180
|Castillos - Rocha
|
|-
 |[https://brandmeister.network/?page=repeater&id=7480087 CX3JU]
  |748102516
  |434.100
|Salto
|
|-
 |[https://brandmeister.network/?page=repeater&id=748102517 CX4AE]
  |748102517
  |433.100
|Nueva Helvecia-Colonia
|
|-
 |[https://brandmeister.network/?page=repeater&id=748102517 CX1HL]
  |748102520
  |433.100
|Young- Río Negro
|
|-
|[https://brandmeister.network/?page=repeater&id=748005601 CX1VH]
  |748005601
  |433.100
|Melo-Cerro Largo
|-
|[https://brandmeister.network/?page=repeater&id=748005604 CX1VH]
  |748005604
  |145.010
|Melo-Cerro Largo
|-
|[https://brandmeister.network/?page=repeater&id=74805601 CX1VE]
  |74800090
  |433.100
|Rio Branco-Cerro Largo
|
|-
|[https://brandmeister.network/?page=repeater&id=7480112 CX5TS]
  |7480112
  |145.100
|Chuy-Rocha
|
|-
  |[https://brandmeister.network/?page=repeater&id=748002101 CX1MB]
  |7480021
  |432.100
|Trinidad-Flores
|
|}


These are unconfirmed frequencies - More Gateways under construction!
<br>

=Analog gateway to DMR, TG 748=
<br>
There is an analog (fm) gateway/access to DMR TG 748 S1 in Montevideo on 147.870 Mhz.(CTCSS 82.5)
It is located in the Parque Rodó neighborhood.
Welcome to use it.
<br>
<br>

=Color codes used in Uruguay to build repeaters and DMO gateways =
==Useful links==
*[http://www.repeater-builder.com/products/pdfs/Maxtrac_connection_notes.pdf Motorola GM300 pinouts]

==Connections/cabling table==
{| 
|- 
  ! width=7% style=" border:1px light gray;"|Signal
  ! width=5% style=" border:1px light gray;"|Color
  ! width=8% style=" border:1px light gray;"|Motorola GM300 pin number
  ! width=10% style="border:1px light gray;"|DB9 pin on Scott Zimmermann's STM32_DVM_PiHat board
  ! width=5% style="border:1px light gray;"|Yaesu FT-7900
  ! width=8% style="border:1px light gray;"|Icom ID-880E (colors are for Yaesu CT-39 cable)
  ! width=37% style=" border:1px light gray;"|Notes
|-
  |Tx audio flat
  |red
  |5
  |2
  |1
  |1(brown)
  | Data input to Tx
|-
  |ground
  |orange
  |7
  |8
 |2
|2 (pink)
|-
  |Rx audio
  |yellow
  |11
  |6
  |4
|4 (yellow)
|Data output from Rx discriminator
|-
  |COS/SQL
  |green
  |8
  |X
  |6
|6 (blue)
|Programmable on GM300, active high on Yaesu FT-7900/7800 
|-
|PTT
 |brown
|3
|5
|3
|3 (orange)
|Tx on when this pin is grounded
|-

|RSSI
 |black
|15
|4
|X
|X
|GM350, not used on GM300, FT-7900/7800 or Icom ID-880
|-
|12V out
|white



|13 
|9 (12V in)
|X
|X
|On the GM300 and similar radios, pin 13 connects  to J8-5 which supplies +12V switched power from the radio on/off switch.This connection can deliver 500 mA current, fused by the 2A internal [http://www.starzip.net/GM300Internal2AfuseB.jpg radio fuse].We recommend the use of a 3 or 5A stepdown external unit to feed the STM32/Raspberry Pi MMDVM .
Do not forget, very important: [http://www.starzip.net/GM300Jumper551D.jpg jumper 551] on A (In this position, the Rx audio on the accessory connector J3 is flat, not de-emphasized, and unmuted), and [http://www.starzip.net/GM300Jumper601B.jpg jumper 601] on B (The high speed Rx data path to the microcomputer is flat from 1Hz to 3kHz). (bottom side of radio). This 601 jumper activates/deactivates the audio low pass filter.

|}
<br>

=Legal information=
https://brandmeister.network/?page=legal
URUGUAY

MCC Prefix	748
Coordinators	CX2AL, CX8BIT, CX4AR,CX4AE,
Website	https://brandmeister.network/
Callsign	ID	Tx freq.	Rx freq.	Permanent TGs S1	Permanent TGs S2	Location	Remarks
CX2CXX	748001	147.360	147.960	748	74800	Montevideo-Pocitos	Temporarily down
CX8RXX	748002					Maldonado	Not yet in service
CX1AXX	748003	146.760	146.160	748	74800,74801,74802,7487	Montevideo - (Sede R.C.U)	RCU-temporarily down
CX8CXX	748004	145.500	144.900	748	74800,74801,74802,748230	Montevideo - Unión	RADIOGRUPO SUR
CX9SXX	748005	432.425	437.425	748	74800,74810	Lavalleja - MINAS	RADIO CLUB MINAS - CX2AL
CX1DXX	748011	432.500	437.500	748	74800,74804,748230	Canelones - Joanicó	RADIOGRUPO SUR
CX9TXX	748012	432.500	437.500	748	74800,74815,748230	Rocha - (Sede de C.R.R - C.A.R)	RADIOGRUPO SUR - CENTRO RADIOAFICIONADOS ROCHA - CIRCULO ATLANTICO
CX4UXX	748013	432.200	437.200	748	74800,74820	Treinta y Tres - Ruta 8 Km 323.700	CX4AR
CX2TXX	748014					Rocha
CX7DXX	748015	432.825	437.825	748	74800,74804,748230	Canelones - Solymar	RADIOGRUPO SUR
CX4AXX	748101	432.100	437.100	748,74800	74800,74801,74802,7487	Montevideo - Pocitos	CX2AL
CX7BXX	748102	432.350	437.350	722,730,914, 7221,7227,7301	7487,74800,74801, 74802,74803,74804, 74805,74806,74807, 74808,74809,74810, 74811,74812,74813, 74814,74815,74816, 74817,74818,74819, 74820,74830,748008, 748102	Montevideo - Paso de la Arena	CX5AL - CX4AE
CX4RXX	748103	432.300	437.300	748	74800,74811,7226	Maldonado - Punta del Este	CX4AR
CX9BXX	748104	432.150	437.150	748	74800,74801,74802,748230	Montevideo - Cordón	RADIOGRUPO SUR
CX7RXX	748106	432.750	437.750	748	74800,74811	Maldonado - Piriapolis	CX4AR - CX3BBL - HB9IBG
CX8DXX	748107	432.550	437.550	748	74800,74804,748230	Canelones - Las Piedras	RADIOGRUPO SUR
CX4VXX	748017	432.350	437.350	748, 74800	7487, 74800,74805,	Melo-Cerro Largo	CX4AE, CX3VB
CX4EXX	748018	146.700	146.100	74800,	74800,	Libertad - San José	Uruguay Link
CX9DXX	748006						Projected
CX8TXX	748007						Projected
CX3IXX	748008						Projected
CX4TXX	748009	432.850	437.850	74800	74800	La Paloma-Rocha	Uruguay-Link, Centro de Radioaficionados de Rocha
CX8JXX	748019	147.090	147.690	74800	74800	Salto	Uruguay Link
CX4CXX	748016	432.450	437.450	74800	74800		Uruguay Link
Callsign	ID	Frequency	Location
CX8BIT	7480021	147.990	Montevideo
CX2TG	7480017	146.598	Rocha
CX2UI	7480045	145.050	Treinta y Tres
CX3AF	7480023	433.050	Paysandú
CX1LA	7480019	145.550	Casupá-Florida
CX2FX	7480095	146.460	Tarariras-Colonia
CX2DAJ	7481017	146.080	Santa Lucía-Canelones
CX2TN	7480132	146.180	Castillos - Rocha
CX3JU	748102516	434.100	Salto
CX4AE	748102517	433.100	Nueva Helvecia-Colonia
CX1HL	748102520	433.100	Young- Río Negro
CX1VH	748005601	433.100	Melo-Cerro Largo
CX1VH	748005604	145.010	Melo-Cerro Largo
CX1VE	74800090	433.100	Rio Branco-Cerro Largo
CX5TS	7480112	145.100	Chuy-Rocha
CX1MB	7480021	432.100	Trinidad-Flores
Signal	Color	Motorola GM300 pin number	DB9 pin on Scott Zimmermann's STM32_DVM_PiHat board	Yaesu FT-7900	Icom ID-880E (colors are for Yaesu CT-39 cable)	Notes
Tx audio flat	red	5	2	1	1(brown)	Data input to Tx
ground	orange	7	8	2	2 (pink)
Rx audio	yellow	11	6	4	4 (yellow)	Data output from Rx discriminator
COS/SQL	green	8	X	6	6 (blue)	Programmable on GM300, active high on Yaesu FT-7900/7800
PTT	brown	3	5	3	3 (orange)	Tx on when this pin is grounded
RSSI	black	15	4	X	X	GM350, not used on GM300, FT-7900/7800 or Icom ID-880
12V out	white	13	9 (12V in)	X	X	On the GM300 and similar radios, pin 13 connects to J8-5 which supplies +12V switched power from the radio on/off switch.This connection can deliver 500 mA current, fused by the 2A internal radio fuse.We recommend the use of a 3 or 5A stepdown external unit to feed the STM32/Raspberry Pi MMDVM . Do not forget, very important: jumper 551 on A (In this position, the Rx audio on the accessory connector J3 is flat, not de-emphasized, and unmuted), and jumper 601 on B (The high speed Rx data path to the microcomputer is flat from 1Hz to 3kHz). (bottom side of radio). This 601 jumper activates/deactivates the audio low pass filter.