[TenTec] Eagle & Heath SB-200 Amp

[Rick at dj0ip.de]

The problem with using an external relay is, it adds additional latency to the scenario, and there is already a timing issue with it on CW.

The very best solution is to replace the SB-200's internal relay with a 12v relay.  Then there is no additional delay added to the switching.   There are kits on the market for doing this.

ALSO, the 17mS pre-dit delay that Bob spoke of requires the very latest firmware release.  Otherwise the delay is only about 7 or 8mS.  (Originally it was 17mS from the factory, but it got screwed up in later firmware releases and wasn't fixed until about a year ago.)

73,
Rick, DJ0IP
(Nr. Frankfurt, Germany)
May the Sunspots be with us!

-----Original Message-----
From: TenTec <tentec-bounces+rick=dj0ip.de at contesting.com> On Behalf Of Rodney Dewald via TenTec
Sent: 25 February 2020 23:48
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Cc: Rodney Dewald <w3krq at ptd.net>
Subject: Re: [TenTec] Eagle & Heath SB-200 Amp

I have used a 12vdc relay and use the contacts to switch the 120v

Sent from Mail for Windows 10

From: Rick at dj0ip.de
Sent: Tuesday, February 25, 2020 5:41 PM
To: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] Eagle & Heath SB-200 Amp

Actually there are various kits for installing inside of the SB-200 that present a 12v keying circuit.
That's why I said he needs to tell us exactly how the amp has been modified, with circuit drawing.

I don't recall all of the names and sources; one was called a soft key, and used solid state keying that could handle the 120 volts, yet presents 12v to the transceiver.

That's why I also said STOP, DON'T DO ANYTHING . . . until we find out.
Otherwise there will be an expensive repair to the Eagle.

73,
Rick, DJ0IP
(Nr. Frankfurt, Germany)
May the Sunspots be with us!

-----Original Message-----
From: TenTec <tentec-bounces+rick=dj0ip.de at contesting.com> On Behalf Of Bob McGraw K4TAX
Sent: 25 February 2020 17:40
To: tentec at contesting.com
Subject: Re: [TenTec] Eagle & Heath SB-200 Amp

WOAH!    STOP!    If the amp has not been modified for the KEY circuit, it has 120 volts on the center pin of the RCA connector.   If this is connected to the Eagle it will immediately destroy the Eagle PTT Amp control circuit.

The amp relay must be changed to a 12 volt relay and other circuit modifications done,  OR you must use an Amp Interface between the radio and the amp.

Who ever gave you the information DOES NOT know what they are talking about.   This is normal for most hams unless they have actually interfaced the SB-200 to the Eagle.    MFJ did make an interface suitable for the application.

As Will Rogers said: "it's not what people know that concerns me, it is what they know that is not correct that gives me concerns".

If you need additional information, I'll be glad to assist.

73

Bob, K4TAX


On 2/25/2020 8:13 AM, Richard Wagner via TenTec wrote:
> I’ve never dealt with an Amplifier before. A friend gave me a Heath SB-200. It appears I have to make a connection between the AMP KEY terminal of the ACC-1 accessory connector and the AMP KEY Socket of the amp. A plug for the socket and short jumper wire were included with my Eagle. This appears to be all that is needed. I’ll connect from the Eagle to the Amp then through my Antenna Tuner to the Antenna. Does this seem OK?
>
> Rich Wagner
> K4MZE
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec

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