Flex transceivers have an interesting way of compensating for
amplifiers with slow T/R switching. As with other transceivers, one
sets a delay time to allow the amplifier relays to close. With Flex
transceivers, however, the operator can start sending (CW in this
case) immediately. The transceiver digitally delays the CW until the
amplifier delay is reached, and then sends it to the amplifier, so
that there is never any clipping of the first dot.
I noticed one day when I was setting the amp delay to 20mS , I
accidentally typed in 2000 mS. When I sent “CQ de W8ZR” I heard the
normal sidetone, but at first nothing else seemed to happen. Then
after two seconds, the amp came to life and the Flex transmitted the
delayed message. I could copy the delayed signal on a separate
receiver. It was an odd experience. I didn’t try this on SSB because
I didn’t have a microphone, but if any Flex owners read this, give it
a try on SSB or AM and see what happens.
73,
Jim w8zr
Sent from my iPhone
> On Oct 6, 2020, at 8:51 AM, "hzp_electronics@juno.com"
> <hzp_electronics@juno.com> wrote:
>
> Hi Alex,
> When using an amp in semi-break in, it is quite common for the first dit or
> dah of each transmission to be shortened due to hot switching of the slow Amp
> T/R relay. The slow T/R relay causes shortening of the first character of
> each transmission. This is especially bad with starting dit's which makes
> the first dit sound weak (i.e. W, A, etc.).
>
> On some transceivers this can be corrected by increasing RF delay. Others
> require something like a QSK-2500 to provide the needed delay.
> .... Bill K3HZP
> DX Connection
>
> ---------- Original Message ----------
> From: Alek Petkovic <vk6apk@bigpond.com>
> To: amps@contesting.com
> Subject: Re: [Amps] Weakness of first two letters of call signs
> Date: Tue, 6 Oct 2020 18:44:59 +0800
>
> Yes. I think it is true. That's why, if I get asked for a repeat of my
> call, I will send it at least twice, without a large gap, so that the
> second time it is sent at full steam. That usually does the trick.
>
> I run the inward QSL bureau for VK6. I see a lot of cards come in for
> VK6FO. Funny thing is, that VK6FO does not exist. The cards are actually
> for 4K6FO. I have heard 4K6FO on the air and it is true, the first dit
> is extremely hard to pick up because it seems to be sent at lower strength.
>
> I don't pretend to know why this stuff happens, I only wanted to concur
> with you and say that it definitely does.
>
> 73, Alek, VK6APK
>
>
>> On 6/10/2020 6:24 pm, Jeff in Mali: via Amps wrote:
>> In my pileups, I find that people often send their call signs only one time.
>> Most call signs are of the form XX#YY or XX#YYY. By the time their sending
>> gets to the #, their signal is strong enough so that I can copy the rest of
>> the call.
>> i am wondering if it is a common property of amplifiers that they take a
>> finite time to reach full power and that as people send their call sign, the
>> first couple of letters are being transmitted at less than full power?
>> Do people in the group have any experience with this phenomenon, or is it
>> just my imagination?
>> I try to get people to send their call 3 times (QSZ 3), but someone has
>> convinced a lot of operators that once is enough.
>> 73,
>> Jeff TZ4AM
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>> http://lists.contesting.com/mailman/listinfo/amps
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