Julius
I bought an 8 band from you 3 or so months ago. I also
use your adapters I use it with my first production
run Orion with no problems. I use it with my Studio
one mike and my latest Heil mike The Heritage. I get
unrequsted reports of great audio .It has worked for
me from day one .
73
John WB4QDA
--- JULIUS JONES <w2ihy@prodigy.net> wrote:
> I recently sold an 8 Band EQ to a customer for use
> with the ORION. Having sold hundreds of EQ's for use
> with other TenTec radios we shipped the customer one
> of our TenTec 4 to 8 pin mic adapters along with a
> cable to go between the EQ and the Orion. This was
> the first ORION, that I knew about, that the 8 Band
> EQ had been connected to. The customer was using a
> Studio 1 Heil Mic. To my surprise the hardware
> shipped would not key his radio. The customer was
> shipped another EQ and cables. This did not work
> also. I downloaded the Orion operating manual and
> looked at it. Before the Orion prior Ten Tec
> radio's had 4 pins mic configurations where the
> audio ground and the PTT grounds were shared on pin
> 2 of the 4 pin mic connector, + audio was connected
> to pin 1, PTT was connected on pin 3 and +9 volts DC
> was connected on pin 4. Figure 2-4 on page 10, of
> the Orion manual ,is not the configuration of the 4
> pin male connector of the ORION but a configuration
> of a mic output without a
> connecting cable. Figure 2-5 , I believe was
> meant to represent the cable that connects between
> the mic in figure 2-4 and the Orion input shown in
> figure 2-3 shown on page 9 of the manual. The key
> thing to understand is that the ground return for
> the PTT instead of being shared with pin 2 is
> connected to the shell of the connector. Using the
> shell connection of the 4 pin mic connector makes
> it possible to provide a 5-th signal for mic control
> (+ Audio, Audio gnd, PTT, + 9 VDC and PTT gnd) We
> experienced RFI in the audio when using a linear
> amplifier when the PTT and Audio shared a ground.
> When the PTT and audio grounds were isolated (the
> EQ utilizes an audio transformer) the audio was
> clean. I have not talked to Ten Tec but I would have
> to believe that having to use the shell of the
> connector was probably something that they found
> was needed after the radio was designed. Those of
> you that have mic's that share PTT grounds and audio
> grounds beware. You will likely
> have an
> RFI problem when using a linear. I hope this
> explains what is going on. I hope my explaination
> helps. Thanks to N4VB for making me aware of
> postings on this subject Julius (W2IHY)
>
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> TenTec@contesting.com
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