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HHI User Pro

$80.00

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The HHI User Pro is an Open Headset Interconnect Standard (OHIS) compliant User Device adapter.  When connected to a headset (or other microphone, headphone/speaker, and PTT), it will connect to any OHIS Radio Device, such as the HHI Radio Pro, regardless of its microphone type, speaker type, or PTT method.

See User Pro Pre-Configurations tab below for help selecting the Headset Type.

OHIS Cables (optional)

OHIS compatible cables are (optionally) available here for your convenience.

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The HHI User Pro is an Open Headset Interconnect Standard (OHIS) compliant User Device adapter.  When connected to a headset (or other microphone, headphone/speaker, and PTT), it will connect that headset to any OHIS Radio Device, such as the HHI Radio Pro, regardless of its microphone type, speaker type, or PTT method.

See the OHIS Overview tab for more information.

Features:

HHI User Pro does everything an OHIS User Device adapter needs to do, and more.

Works with every analog headset, or microphone and headphones:

HHI User Pro had three 3.5mm 4 pin TRRS sockets: one dedicated to PTT, and two that can be configured in any way to match the pin-out of your headset, or microphone and headphones.  Any signal can be put on any pin.  It can be configured for either dynamic or electret microphone elements.  Even XLR studio microphones are supported with a 3.5mm to XLR cable (no 48v Phantom power support.)  Headphone outputs can be treated as Line Out for the purpose of driving an external speaker power amplifier.

See Additional Information tab for physical and electrical details, and User Pro Pre-Configuration tab for help selecting which User Pro is right for you.

Built-in PTT:

The HHI User Pro has the OHIS socket on one side, and the 3.5mm sockets to your headset on the other.  This makes it a convenient “bump on the wire” location to include a PTT button.  If you don’t want to hold the HHI User Pro in your hand, you can connect a simple contact closure style switch to the Tip and Sleeve of the PTT 3.5mm socket.

Built-in VU meter for microphone level setting:

Setting the microphone level is critical for OHIS interoperability. HHI User Pro includes a two LED VU meter, and an easily reachable trim pot, to make level setting the microphone simple.

Preconfiguration

HHI User Pro comes pre-configured for one of the following common headsets:
Heil Headsets, with Dynamic mic elements.
Heil Headsets, with Electret mic elements (the "iC" line)
RadioSport, with CS6-FLX or similar cable.
CTIA, aka "PC Gaming" headsets. Also commonly used on mobile phones (that still have a headphone jack, anyway).
Physical Connectors

Three 3.5mm sockets:
"PTT" Dedicated with PTT on Tip, and Power Ground on Sleeve.
"Mic" and "Headphones", both completely configurable with any signal able to be put on any pin.
Microphone Support

Dynamic microphone: -30dBV to -63dBV (no DC bias voltage)
Electret microphone: -15dBV to -48dBV (+5v DC bias voltage)
Mic+ and Mic- can be connected to any pins on the Microphone or Mic connectors.
Mic- is separate from Ground so it can be used with balanced or unbalanced microphones.
Headphone Support

Exact drive capability is determined by the OHIS Radio Device; HHI User Pro just passes it through.
The OHIS Spec is: "Conventional Headphone Level." 0dBV to -10dBV at full volume, able to drive 8 to 64 ohm load.
Can also be used as a Line Out to drive a power amplifier, mixer board, or similar.
PTT

A PTT button is on the case for hand-held use.
Dedicated 3.5mm socket, with contact closure between Tip and Sleeve for user supplied external PTT.

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OHIS Overview

A quick overview of the Open Headset Interconnect Standard, or OHIS:

An OHIS Radio Device adapter, like the HHI Radio Pro, converts the radio’s native electrical and physical connections to the OHIS standard, and provides an OHIS Radio port.

An OHIS User Device adapter, like the HHI User Pro, converts any headset’s native electrical and physical connections (or other mic, headphone/speaher, and PTT) to the OHIS standard, and provides an OHIS User port.

OHIS allows any OHIS User port to connect to any OHIS Radio port, regardless of the electrical or physical properties of the devices behind them.

User Pro Pre-configurations

There are 4 available pre-configured HHI User Pros.  If your headset is not supported by one of the 4 pre-configured options, you can buy any option and configure it yourself; see the HHI User Pro User Guide for details on configuring the HHI User Pro.

How The Configuration Is Made:

Note how the HHI User Pro circuit board has a grid of solder pads.  The user makes jumpers with a blob of solder, but at manufacturing, jumpers are made with a 0 ohm resistor because they can be automated with a pick-n-place machine.

On this grid of jumpers, the rows are the pins on connectors, such as “Microphone, Tip” or “Headphones, Ring 2”.  The columns are signals, such as “Headphones Left” or “Mic+”.  A signal is connected to a pin by placing a jumper (either a 0 ohm resistor at manufacturing, or a solder blob by the user) at the intersection of the pin (row) and signal (column).

The jumpers are broken into two groups, one for the 3.5mm socket labeled “Microphone” and one labeled “(Head) Phones.”  This allows any signal to be put on any connector on either the Mic or Headphone sockets. (The third 3.5mm socket is hard-wired for PTT on Tip, and Ground on Sleeve.)

Note the three jumpers in the top left corner, in a wide flat “U” shape, labeled “Dyn” and “Elec”.  These jumpers enable, or bypass, a microphone pre-amp.  With the two outside, vertical jumpers on and the horizontal middle jumper off, this puts the microphone preamp in circuit and will bring a Dynamic microphone element up to the OHIS standard level.  With the two outside vertical jumpers removed, and the horizontal middle jumper on, this bypasses the preamp and connects the Mic+ directly to the OHIS connector, used for headsets with Electret microphone elements.

The configurations below will document which 0 Ohm resistors are pre-populated by Halibut Electronics for a given configuration, so you can compare with the documentation for your headset to verify which one you should select.

CTIA, or “PC Gaming Headset”:

The Cellular Telephone Industries Association (CTIA) established a 4-pin 3.5mm TRRS wiring standard (formerly) used by mobile phones, and now adopted by many laptops and desktop computers.  If you buy a wired analog headset for a computer, it likely has this connector, or comes with an adapter to work with this connector.  Since it is only uses a single 3.5mm jack, both the Mic and Phones sockets on HHI User Pro are wired the same so either can be used.

  • Mic, and Phones:
    • Tip: Headphone Left
    • Ring 1: Headphone Right
    • Ring 2: Headphone Ground, and Mic-
    • Sleeve: Mic+
  • Microphone Preamp:
    • Bypassed. Jumpered for Electret microphone elements.

Heil Dynamic:

Heil Sound has used the same two 3.5mm connector pinouts for many years. The only difference between the two HHI User Pro “Heil” configurations is whether your headset has a Dynamic element fitted (the default for Heil headsets), or an Elecret element (the “iC” elements, sold for use with Icom radios).

  • Mic:
    • Tip: Mic+
    • Ring1, Ring2, Sleeve: Mic-
  • Headphones:
    • Tip: Headphone Left
    • Ring 1: Headphone Right
    • Ring2, Sleeve: Headphone Ground
  • Microphone Preamp:
    • Inline. Jumpered for Dynamic microphone elements.

Heil Electret:

As mentioned above, the only difference here is that it’s jumpered for an Electret Microphone element. The pin out is the same.

  • Mic:
    • Tip: Mic+
    • Ring1, Ring2, Sleeve: Mic-
  • Headphones:
    • Tip: Headphone Left
    • Ring 1: Headphone Right
    • Ring2, Sleeve: Headphone Ground
  • Microphone Preamp:
    • Bypassed. Jumpered for Electret microphone elements.

RadioSport with CS6-FLX:

Where as Heil headsets have one cable and Heil sells radio specific adapters, Radio Sport instead sells different cables with radio specific connectors.  This HHI User Pro configuration assumes you have a Radio Sport cable similar to the CS6-FLX which breaks out to two 3.5mm TRS connectors, and a PTT.

This is also the HHI User Pro to select if you intend to use a 3.5mm to XLR cable for use with a professional microphone, though you will need to enable the Dynamic microphone pre-amp.  The important part is that Mic- and Ground are kept separate as is done with XLR.  This is as opposed to the Heil headsets which only use a 2 pin TS connector for the microphone, so the shield is also Mic-.

  • Mic:
    • Tip: Mic+
    • Ring1, Mic-
    • Ring2, Sleeve: Ground
  • Headphones:
    • Tip: Headphone Left
    • Ring 1: Headphone Right
    • Ring2, Sleeve: Headphone Ground
  • Microphone Preamp:
    • Bypassed. Jumpered for Electret microphone elements.
      • For use with XLR microphones, the user must re-jumper this for Dynamic.

Documentation

Note: Documentation for all Halibut Electronics products can be found at the Documentation page.

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