[Milsurplus] [MMRCG] SR Systems SR-206

[boeing377 at gmail.com]

And I thought the Collins filters in Northern marine radios was my secret.
😉

Being tied into the commercial fishing community has benefits. When xtal HF
radios were replaced by synth I got lots of cast offs. Some pretty useless.
Some great parts sources.

I really liked the Benmar HF antenna coupler. 8 high quality, manually
adjustable roller, inductors, and associated variable caps (unfortunately
not vacuum variable). Not auto tune.

Mark
AF6IM

On Mon, Sep 18, 2023 at 2:40 PM Hubert Miller <Kargo_cult at msn.com> wrote:

> Real interesting info on SRS, Bob. I wondered how far you could get from
> the set up channel tunings when using an add-on VFO.
> Among older sets, the GRC-13. It also has the single crystal, "crystal
> saver" type circuit.  50 kHz is not much but it is something.
> At one time, i thought i'd collect Northern Radio ( Seattle), but that
> proved not practical. I have taken apart a number of old
> Northern tubed radios and also a few of the later hybrid N550. The latter
> sets do have one, and if you're real lucky, two Collins
> 455 filters. I still have one N550 to go but sometimes i think, get rid of
> the vac tubes and the heavy heavy HV transformer and
> just use it with the 5W PEP solid state final driver. It would be neat to
> be able to use the channel knob for tuning but...this
> control seems to be wired right to circuit boards...a big mess. I also
> have a few of the later all transistor Northern radios.
> Some have a "drift cancelling" circuit which i don't fully understand yet.
> But with the availability of DDS VFOs now, maybe
> these can have a chance of living on. USB fits with the coverage of most
> of these high seas models which tuned up to 18 or
> 21 MHz.
>
> I recall maybe 4, 5 years ago i gave a stack of Northern 711s to a ham
> radio friend. ( Who doesn't read this list. ) This was a
> 100 watt, 1.5 ( yes, you read that right ) to 9 MHz USB radio, pretty
> simple circuit, no kinks. This would have been a primo
> candidate for any of the included bands, just change the channel control
> to a VFO. I also gave him some sets of "upgrade
> kits" of some kind.  Now i regret like hell giving all those away. He is a
> great guy, but his Modus Operandi is buy low,
> play with it for a while, then put on Ebay at marked up price. So i know
> where the 711s went, and the 2 of GRC-9 which i
> sold him. He was talking to another fellow i know about buying that
> fellow's TRC-77, and i cautioned the other fellow, "You
> can do what you want, but if you sell it to him, next thing you know, that
> radio will show up on Ebay, so be advised."
>
> I have thought of replacing the tube finals in some of these hybrid sets
> with solid state MOSFET PAs. Even 20 watt PEP would
> be satisfactory, i think. Of course, you have to find room for the LP
> broadband output filters.
> But i digress, as usual.
> -Hue Miller
>
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