Re: [VHFcontesting] DEMI 222 help

[Ethan Miller K8GU <ethan@k8gu.com>]

Bill, et al,

Thanks!  That is the right manual.  Not sure how I missed it before.  I
think I have everything I need...thanks to everyone who replied on the list
and direct.

See you on the bands (and 222 when I get there)...

73,

--Ethan, K8GU.


On Wed, Jan 5, 2022 at 12:57 PM Bill Olson <callbill@hotmail.com> wrote:

> Ethan, the DEMI instruction manual for that transverter is online here it
> is for the "kit" version: vhflna doc (netsolhost.com)
> <http://01895fa.netsolhost.com/PDF/Manuals/222-28_677.PDF> This has all
> the info on the high power and low power IF drive options..
>
> The M67712 is pretty robust.. I suspect it will be just fine when run at
> the output level you need for the Larcan..
>
> bill, k1DY
>
>
> ------------------------------
> *From:* VHFcontesting <vhfcontesting-bounces+callbill=
> hotmail.com@contesting.com> on behalf of Ethan Miller K8GU <ethan@k8gu.com
> >
> *Sent:* Wednesday, January 5, 2022 3:11 AM
> *To:* VHF Contesting <vhfcontesting@contesting.com>; Midwest VHF/UHF
> Society Mailing List <mvus-list@lists.febo.com>
> *Subject:* [VHFcontesting] DEMI 222 help
>
> All,
>
> I acquired an old DEMI 222-28 transverter from the K8CC estate last summer
> and I'd like to get it rolling for the spring/summer contests (I have to
> beam through "Mount Kettering" to get to the center of 222 Tuesday nights
> from my home QTH and biggest amp I have for 222 is a 60-watt Larcan
> pre-driver).
>
> This unit has the M67712 hybrid as the PA and does not seem to match any of
> the legacy schematics found on (the current) DEMI web site.  It's wired for
> common-IF with what looks like an attenuator for high drive power.  Do I
> need to know anything special about converting it to low-drive split-IF to
> work with my K3 and K2 (and TS-930S)?  Or can I just remove the
> attenuator/switching board and run coax straight from the rear panel
> connectors to the RXIF and TXIF pads on the board?
>
> Also, any experience or opinions about using the M67712-based transverter
> on digital modes?  Muffin fan?  Low power?  Both?   I've been off the bands
> above 6m the past couple of years since I moved from FM19 to EM79; but, if
> my experience on 6m and the kvetching on the reflectors are any indication,
> I'll need to spend some time on FT8.  I'm sure the Larcan pre-driver will
> be fine at high duty cycle.
>
> Thanks/73,
>
> --Ethan, K8GU.
>
>
> --
>
> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.k8gu.com%2F&amp;data=04%7C01%7C%7C3bfbe71d726446156f9208d9cff9188e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637769491037981918%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=%2FPIRuek1rp1milzVS93tsLDMIJ%2Fzm8fXCovoiSP1nHY%3D&amp;reserved=0
> Repair.  Re-use.  Re-purpose.  Recycle.
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
>
> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.contesting.com%2Fmailman%2Flistinfo%2Fvhfcontesting&amp;data=04%7C01%7C%7C3bfbe71d726446156f9208d9cff9188e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637769491037981918%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=drRKLkxJeLp6rY53Pal2v4gqdUc7ETFpep%2BT%2Ff7kd1U%3D&amp;reserved=0
>


-- 
http://www.k8gu.com/
Repair.  Re-use.  Re-purpose.  Recycle.
_______________________________________________
VHFcontesting mailing list
VHFcontesting@contesting.com
http://lists.contesting.com/mailman/listinfo/vhfcontesting