[hpsdr] Hermes question -- amplifier keying

[Mike Seguin N1JEZ]

Hi John,

I hadn't seen a response... but the delays are under Setup | Options in 
PowerSDR. PTT delay, MOX Delay RF Delay.
Also under Setup | Transmit there is VOX delay if you use it.
Finally under Setup | DSP | Keyer there is a Break In delay.

73,
Mike, N1JEZ
"A closed mouth gathers no feet"

----- Original Message ----- 
From: "John Ackermann" <jra at febo.com>
Sent: Thursday, May 30, 2013 5:49 PM
Subject: Re: [hpsdr] Hermes question -- amplifier keying


> ***** High Performance Software Defined Radio Discussion List *****
>
> Thanks, Mike.
>
> With the ANAN-10 I have the drive I need, but I'm wondering about the 
> keying timing as you suggest.
>
> I know that the PowerSDR with the Flex hardware supported various 
> sequencing delays in the configuration tabs.  Is something like that 
> available in PowerSDR for the HPSDR hardware?  If it's there, I've missed 
> it.  Seems like it would be very helpful to be able to specify a turn-on 
> delay for the exciter, and a turn-off delay for the keying output.
>
> 73,
> John
> ----
>
> Mike Collins said the following on 05/26/2013 11:02 PM:
>> Hi John and Jeff,
>>
>> I bought Jeffs 418 amp from him and have been using it quite a bit.
>>
>> I built a 5W driver amp (RD16) for boosting up the Hermes level for the
>> TenTec 418.  I initially used the
>> Hermes amp key output to drive both the driver and 418 keying inputs.
>> The 5W driver I built was very quick
>> to turn on so had some faults (no damage) detected by the 418 circuits.
>> Using the Hermes to drive the 418 keying
>> input; and using the 418 output (delayed as you noted) to drive the 5W
>> driver amp did fix the faults.   This works great other than if
>> I only want to use the 5W driver (for remote antenna tuner) becuz the
>> 418 doesn't pass the keyline thru when turned
>> off.   The final solution for me was to add a small RC time constant on
>> the 5W driver keying circuit and go back to the Hermes
>> driving both amp keying circuits...  now I can run 5W or the full 75W
>> from the TenTec 418 (no need for the 418 keying output).
>>
>> Also reverse engineered the serial control interface on the 418 and
>> wrote a small patch to the firmware that lets me use
>> the Hermes Apollo connector to auto band switch the 418 amp.  This all
>> works really good and can go anywhere with the
>> amp auto switching as I change bands in PowerSDR.
>>
>> If you or anyone wants/needs the 5W driver schem or RC delay
>> circuit.....or the firmware patch to control a TenTec 418; just drop me
>> a email.
>>
>> 73,  Mike Collins   KF4BQ
>>
>> On 5/26/2013 9:52 PM, Jeff Kelly wrote:
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> I used 2 and 25 on the breakout cable from Hermes and it worked fine
>>> keying the 418.  (make sure you have the corrected pin #'s)
>>>
>>> Jeff
>>> K2SDR
>>>
>>>
>>>
>>> -----Original Message----- From: John Ackermann
>>> Sent: Sunday, May 26, 2013 9:35 AM
>>> To: HPSDR List
>>> Subject: [hpsdr] Hermes question -- amplifier keying
>>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> I'm probably going to be bother the list a few times over the next week
>>> or so as I try to get my portable Hermes station ready for a trip to
>>> northern Michigan.  I'll post these questions separately to keep any
>>> threads organized.
>>>
>>> I'm using a TAPR-built Hermes with the Apache Labs 10W amp and
>>> enclosure, so it looks like an ANAN-10 to PowerSDR.
>>>
>>> The 10W output is driving a Ten-Tec 418 amp (5-10W in, 100W out). The
>>> 418 has both a key-in and a key-out line.  If I read the documentation
>>> correctly, the key out has a 4ms delay on keying to avoid hot switching.
>>>
>>> Question -- should I simply use the Hermes key-out line to drive the 418
>>> and count on the Hermes TX sequencing, or is it worthwhile to send PTT
>>> to the 418 key-in and let the 418 key-out drive Hermes?
>>>
>>> Thanks,
>>>
>>> John
>>
>
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