[Allstar Digital] spectra vs ?

[Stephen - K1LNX]

Good to know on the CDM's... my near future plan for the MMDVM is for C4FM
and I really want to use that series of radios as they are plentiful and no
old DOS RSS... but I have had luck with using RSS in DOSBOX under Windows
7. I've programmed up SM50's, MaxTrac's, and GM300's without any issues.

73
Stephen
K1LNX

On Wed, Aug 3, 2016 at 12:36 PM, Bryan D. Boyle <bdboyle at bdboyle.com> wrote:

>
> The Spectra, while a great radio for analog, and configurable like all get
> out (multiple heads, handsets, etc.), doesn't have a good place to pick up
> true discriminator (flat) audio with enough fidelity to drive the mmdvm. It
> was made for analog service, and their detection circuit just doesn't
> extract a good signal for digital use.
>
> Add to that the self-destructing capacitor issues on both the motherboard
> and display board (which will destroy the traces if left unrepaired), and
> the fact they're over 20 years old at this point...there are better (and
> not expensive) options.
>
> I've used, successfully with no more than 5 wires to the back connectors
> (flat rcv, gnd on the rx side, flat audio in, ptt, gnd on the tx side),
>  both the GM300 and cdm750 radios both on allstar via a URI and digital
> through the mmdvm.
>
> Program for 25k bandwidth (let the sw handle bandwidth limiting,
> etc...don't put the hw in the way), if using the 300s, make sure the
> jumpers are set correctly on the board, program up with rss for the 300,
> CPS for the cdm, hook up and go.
>
> I do suggest, if you don't block TG 3100 on brandmeister, that you have a
> decent muffin fan blowing on the rear of the tx; because 3100 is almost
> constantly keyed up.  measured the fin temps with the fan on, and with
> almost constant us, never gets more than 10 degrees F above room temps...
>
> Just for the heck of it, I did connect up an old hamtronics 440 machine I
> had that was on my freq, and even it worked, because it is a true
> discriminator rcv and the tx input is through a varactor right to the
> oscillator...not that I'd ever keep that in service, mind you...
>
> Just some thoughts.
>
> --
> Bryan
> Sent from my iPhone 6S...No electrons were harmed in the sending of this
> message.
>
>
>
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>
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