If there is no transmit delay, perhaps during the amplifier receive to
transmit switch over, the transceiver is seeing an instant of high vswr that
activates the rf back off protection. If so, it takes some small time for the
back
off to recover to allow full power output.
This is total conjecture on my part; no direct experience.
73,
Gerald K5GW
In a message dated 1/27/2009 10:35:15 A.M. Central Standard Time,
nx5m@txcyber.com writes:
No guys, I do not have ALC hooked up.
In the manual I believe it says this is not necessary because with the 990
there is no possibility of driving it with more than 130 watts. I am
driving with about 70w to get 1500 out of the amp.
I have some deoxit and will try to clean the contacts and see if that helps.
I can press the mox button on the radio and the amp relays close at
exactly the same instant as the radio goes into tx.
Bob
> Does he have ALC hooked up?
>
>
> ----- Original Message -----
> From: "Rick Stealey" <rstealey@hotmail.com>
> To: <amps@contesting.com>
> Sent: Tuesday, January 27, 2009 6:30 AM
> Subject: [Amps] Slow keying issue
>
>
>>
>> The responses so far don't really mesh with the evidence Bob, NX5M
>> presented:
>>
>>> Although the relay was closing instantly the power output of the amp
>>> was
>> not really kicking in until after the first or second letter of my call
>> was sent.
>>
>> He says the relay (presumably in the PA) is closing instantly. Tony,
>> K1KP
>> presents a solution that seems to be appropriate for speeding up relay
>> switching for cw keying speeds, something usually deployed to get relays
>> to switch in the 5-20 ms timeframe. But Bob says his rf is delayed so
>> much that he can see the 60 watt driver power on a wattmeter, which to
>> me seems to indicate his delay is MUCH longer than 20 ms.
>>
>> Bob, could it be that your relay contacts in the amp are contaminated?
>> Would it be convenient to get in there and run some paper over the
>> contacts,
>> coated with alchohol or DeOxit?
>>
>> Rick K2XT
>>
>> _________________________________________________________________
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>
>
>
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