Connect a linear amplifier to hermes lite 2

[Michel Sabatino (IZ5CLJ)]

Hi.

I cannot run my external amplifier from the hermes lite.

I am using thetis 2.9

I have connected a cable from the port EXTTR to the amplifier.

How do I instruct the software to ptt the amplifier?

Thanks in advance.

73, Michel.

[Andy-ik7ytt]

if enable pa and enable full duple are both on. you are ready to go in tx. 

EXTTR is automatically enabled.

[Gerrit Heijting]

Hi Michel,

Tested here and connected a ohm meter with Beep to  EXTTR.

If the TX led is lit then I hear Beep.

So its ok here.

I connect my first lineair tomorrow so I tested now.

Software used is sdr-console.

Have a nice day,

73's Gerrit

[radi...@mail.com]

See here (EXTTR) for details of the port.

https://github.com/softerhardware/Hermes-Lite2/wiki/External-Connections

I have just made straight connection to my DX World-e linear and keys it fine.

What is your amplifier and what are the specifications of the PTT line on the amp?

Max

[Michel Sabatino (IZ5CLJ)]

Hi.

Thank you for your help.

My linear amplifier is an ACOM 1000.

It requires "ground on transmit" to be keyed.

Thanks again.

Michel.

[Antonio Del Manto]

Hi, I also have a PA (OM POWER 3500 HF), but to connect it to the HERMES LITE 2, should it be enough to connect the PTT from the HERMES to the PA? I have 3 SDRs that I've been connecting this way for years and they work fine!! Maybe the HERMES has something different? Thanks.

[Antonio Del Manto]

OM POWER 3500 HF

I connect the other SDRs I have with the PTT...

PTT sdr-PA

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[Joey G.]

I think I had a similar issue but finally just used a 5v relay with diode across the coil connected to the Hermes PTT out to trigger the ground side of the relay.  It only pulls like 40ma when in TX so I don't think it's hurting anything directly driving a small relay from the PTT out.  The PTT out will work directly with my RM Itali amp but not other amps I have, so I had to do this relay fix on my other amps.  Just use a small relay and keep an eye on the amps it pulls. 

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[Jerry Kaidor]

I have connected my HL2 to my homebrew LDMOS linear.  The linear requires a minimal-current pull to ground for PTT.  It also needs

Yaesu "BCD" band codes - four wires each of which is either high ( +5V ) or low, forming 16 possible codes.  I used the I/O board for this, and a kind subscriber on this list gave me the code to run it.   For just PTT, the HL2 should be able to do it as is.  But there is a current limit for the output transistor - forget what it is.

                           - Jerry, KF6VB