Datron HH1077

Background

This came from Murphy's Surplus (eBay store).

Datron used to make the PRC-1077 that was their backpack version of the PRC-77 VHF low band FM radio.  This HH1077 is a Hand Held version of the PRC-1077.  It is part of their SPECTRE V product line.

This radio kit was part of the Foreign Military Sales (Wiki) to a country with the FMS code of "QB"sponsered by the Defense Logistics Agency (DLA) (FMS code "B".
Four years ago, i.e. July 2021.

Description (Datasheet)

RF Power Out: 0.5, 2 or 5 Watts.

F1 Channel Knob: 15 preset channels + "F" position to access 100 channels by using scroll (arrow) keys.

Major Accessories for stock HH1077

HH-3900BAT	3.9 AH Li-Ion battery
HH-CHG2	Mains Battery charger
HH-CHG3	Mobile battery charger
HH-ANT1	Flexible 30-88 MHz antenna
HH-MIC2	Speaker/microphone
HH-SCR1	Voice Scrambler (Installed)

Accessories Supplied

HH-??? Plain Text Voice Module

p/n: SCSPA138220 AC Power Supply for the Battery Charger

Model: LGSPS138220
Input 100 - 240 VAC, 50/60 Hz (comes with German plug (Wiki: CEE 7/4)
Putput 13.8 VDC <= 2.2 Amps
_____ OD x _____ ID power connector; Center Positive

PS I was planning to cutting off the German AC plug and splicing on a US plug, but a US cord was included.

Accessories Not Supplied

HH-3900BAT Battery

This makes a problem in powering the radio.

Programming Cable & Software

This is a problem as these are needed in order to set the frequency and other parameters for each of the 15 channels.
You can not set the frequency of the radio using just the radio.

Catlin, KC9LFD posted information on the UART pinout:

	"I finished mapping out the UART interface and did a successful read using a FT232 based USB to UART adapter and did a successful read and write by carefully holding breadboard jumper wires onto the pins lol   Looking at pins left to right, top left being on 1 and top right being pin 2: Pin 2: GROUND Pin 4: UART RX (hook to TX on your adapter) Pin 9: UART TX (hook to RX on your adapter)" The RS-232 protocol may be either 4800 8N1 or 9600 8n1.
	| Pin | Programming mode | Normal Mode | Notes | |-----|------------------|--------------|------------------------------------------------------| | 1 | | RX audio out | | | 2 | GROUND | GROUND | | | 3 | +4.930v | +4.930v | | | 4* | UART RX | Mic in | +2.89v constantly, needs capacitor to remove voltage | | 5 | GROUND | GROUND | | | 6 | | | | | 7 | +4.84v | | Maybe RTS/CTS? | | 8 | +4.84v | | Maybe RTS/CTS? | | 9 | UART TX | PTT+ | +4.97v constantly | | 10 | | | |   * Pin 4 will likely need a 1-10uF capacitor to block the DC voltage, unless you're going to run an electret mic, to prevent damage to the audio circuit feeding it. I used a non-polarized but an electrolytic should work with the positive side going to "Mic in".    Personally, I used a 10uF non-polarized capacitor in series with "Mic in" with the addition of a 600ohm 1:1 audio isolation transformer when feeding from a computer sound card. I also used a 1:1 audio isolation transformer on the RX audio side just for added safety (and I have several laying around so why not lol)   If one wants to use this HT for something like FT8, remote PTT might be able to be triggered by the unused RTS or CTS pin of a UART interface to bring PTT+ to ground, might need a transistor, I'll do some tinkering this weekend.    73 de Catlin
	USB to Serial adapter: DSD TECH SH-U09C USB to TTL Serial Adapter with FTDI FT232RL Chip

     

DC Power

The minimum DC voltage is just below 5 Volts.  Radio beeps if battery is <6.5V.
The current v. voltage does not look like a linear supply (power goes up with voltage) and does not look like a pure switching supply (power constant with supply voltage change).  Any thoughts?  let me know.

On Tx the current draw at 8V is about 2 Amps.  The Agilent E3617A is rated for 0-60 V 0-1A so failed when Tx was pressed.
The HP 6038A rated for 60V & 10A works well.

Fig 11 DC connection

V mA Rx mW Tx mW 4.86 84 408 5 86 430 6 89 534 7 89 623 8 89 712 9 62 558 10 62 620 11 12

Controls

These work like a Japanese watch.  That's so say combination presses have various functions also short and long presses have different functions.

			Monitor	^	V
			(press&Hold): Lock On/Lock Off
Shift	Display Chan Freq	(P1,P2): Programmed Functions	(^V): Squelch Level	CTCSS: select	Power: Hi, Med, Lo
^		Chan: F - Chan Up	Chan: F -  Clone Mode
V		Chan: F - Chan Dn	Chan: F -  Program Mode

Photos

Fig 1.	Fig 2.	Fig 3.
Fig 4	Fig 5 Antenna connector may be TNC	Fig 6
Fig 7 Option White Label: HH1077-KIT-AE Programming/Cloning connector: 10 Contacts Mystery Small plastic square   The Rambler Swiss Army Knife can loosen    the (-) and (+) screws. Cover for 10 contact connector Black circle is battery compartment vent.	Fig 8 Charger: HH-CHG2 Charger Power Supply p/n: SCSPA138220    Input: 100-240 VAC, 50/60 Hz    Output: 13.8 VDC <=2,200 mA    Center Positive German PS Cord US PS Cord	Fig 9 Model: HH-CHG2 Input: 13.8 VDC, Output: 9V <= 2,000 mA LED Condition Off No Battery Red Charging Green Fully Charge
Fig 10 Antenna is marked in inches (and tenths of an inch) to 18".   On the other side it's marked in cm Belt Clip to be mounted on battery Optional clear voice module

Patents

Related

Harris RF-5800V-HH Falcon II (Civilian PRC-152) -
Paint Ball Replica PRC-152.
PRC-6725 (PRC-139) has multi pin side connector
Radios - LF, HF, VHF Low, VHF Hi, UHF, Microwave, Tempest, Burst, Squad . . .

References

Ref 1. Murphy's Surplus (eBay store)
Ref 2. Google Groups: Transworld & Datron Radio Equipment -
Ref 3. Datron - HH1077 - Datasheet -

Links

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Page Created 2025 July 9