Ver yinteresting gary...
I have to wonder why some guys will spend $500 for an external accessory to do
QSK with
their linear amplifier. The system in my TT 422 is so simple. A couple of
simple boards and
a relay.
On 19 Mar 2014 at 22:28, Gary Smith wrote:
> That was a good breakdown, those are fun to do & read.
>
> I look at it this way; I've been hamming 35 years and I ran QSK for
> the last 33 years. I've never worn out a relay in an exciter. I had
> the Corsair II since it was new & made the backup rig in 09.
>
> In amps... The original SB220 had two that needed replaced. I put QSK
> in it and that was good for several years using a RJ1A. I bought an
> old Alpha several years ago and I had the amp less than a month &
> needed to replace the HC-1A in it, no knowing the history of the
> relay I can't speak for why it failed. I opted to replace it with one
> of the RJ1A silicone encapsulated ones which was extracted from a
> defibrillator unit I believe. It has had no trouble. I have a spare
> in case it fails again but I'm not holding my breath. :)
>
> Also, I have a remote QSK unit containing two RJ-1A's within which is
> inserted in the line and offers bias control. I used that with an
> Ameritron AL-1500 for several years to give me QSK, I've never had
> any trouble with it and I bought it used.
>
>
>
> 73,
>
> Gary
> KA1J
>
> > I operate QSK and have the past thirty years using TenTec equipment.
> >
> > One reason given by others for not running QSK is that the relays wear out
> > sooner in the transceiver and amplifier.
> >
> > from http://www.ad5x.com/images/Presentations/QSKals500als600RevA.pdf
> >
> > How Long will the Relays Last?
> > What kind of life can you expect from the relays? The relay life is
> > specified at 100
> > million operations minimum at 36,000 operations/hour. The service life
> > increases as the
> > operations/hour decreases. So let´s use the standard PARIS text that is
> > used for
> > determining code speed.
> >
> > PARIS has 10 dits and 4 dahs = 14 relay operations/minute at 1 WPM.
> >
> > Assuming an average of 25WPM code speed, you would have 360 relay
> > operations per
> > minute. So, 100 million operations = 4630 hours. Now you normally operate
> > 50%
> > transmitting and 50% receiving during a QSO, so your relay operating time
> > should
> > double to 9260 hours. There are 8760 hours/year, which means you could
> > operate 1.057
> > years at 25 WPM before the relays exceeded their lifetime spec - IF you
> > operate 24
> > hours/day! But when you operate, you are probably listening more like 75%
> > of the time
> > and in a QSO 25% of the time. So this says that your relay operating life
> > will be over 4-
> > years if you operate 24 hours/day. So what do you normally average in
> > operating
> > time/day? I bet it is not more than about an hour/day. But let´s say you
> > average 4-
> > hours/day of operation (i.e. you are not married and have no kids, you
> > don´t shop or eat
> > or sleep much, and you don´t hold a full-time job). So the relay life will
> > extend to about
> > 25 years! The bottom line - Don´t worry about wearing out the relays
> > anytime soon.
> >
> > 73 ES DX,
> > Gary - AB9M -...-.-
> > _______________________________________________
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> > TenTec@contesting.com
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> >
>
>
>
>
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