r. While NOT well documented,
Most savvy hams can work their way through.
Let me know what you are looking for.
The audio mods are VERY simple and easy to do. They expand the audio
width by replacing a couple of caps.
Bob - N0DGN
On 7/2/2010 9:35 PM, Paul Christensen wrote:
> Are the W3CK mod
Are the W3CK mods published on the web? Tnx!
Paul, W9AC
- Original Message -
From:
To:
Sent: Friday, July 02, 2010 6:52 PM
Subject: Re: [AMRadio] DX 60 mods
>I have a DX-60 with the W3CK mods. It's AMAZING how many UNSOLICITED
> AWESOME AUDIO reports I receive. People simply are
> then re-wire it.
I sure would. To a reversible "L" for use with coax lines -- or a balanced
version of the L for open lines.
With the classic C-L-C "T" design, multiple panel control settings can
create an illusion of a low-loss transformation (unless output C is always
maximized for the gi
>I looked it up, less then 2000 people work for the FCC.
> The number has been going down for a while.Most seem to deal with legal
> issues...
A sprinkling of good news may be on the horizon: Two Congressional bills
are being introduced, each termed the "FCC Commissioners' Technical Resource
E
> Still, the intent of Part 15 is to protect licensed users from
> interference from unlicensed devices, and the best option we have to
> enforce current regulations (or potentially get better ones) is to
> continue to elevate our concerns to the FCC and those who oversee the
> agency.
>
> 73, Bob
> "No place in Part 97 is the bandwidth for eater SSB or AM defined."
Section 97.307(a) is the closest regulation we have pertaining occupied
bandwidth in the American amateur service. However, some folks have argued
that Sections 2.201 and 2.202 apply to the Part 97 service since Section
97.3
> "Years ago my young son bought one of those scooters with his own
> hard-earned money..."
Steve,
The switch-mode chargers used for scooters are notoriously noisy. I had a
similar issue with the neighbor to the side of me. These supplies offer
little or no common-mode filtering between the s
> Hi Paul: that seems to match with the interval I am hearing here between
> the
> two sweeps then the long interval, but, why do they do the wide freqencey
> range, if that is what I am hearing.
There's an IEEE paper that discusses the methodology although I've not read
it.
> is it a pulsed si
For those of you with Google Earth, the ROTHR transmitter Texas site can be
seen here:
http://tinyurl.com/yb7qcdo
And the companion receive site:
http://tinyurl.com/yeq5edl
Each ROTHR transmitter site has a companion receive site located nearby.
Presumably the receive sites are used to monito
> Apparently NOT an OTH radar, if it sweeps so
> slowly.
The 18 minute sweeps are coming from this ROTHR system. Each of the three
sites can be heard, all with different signal strength depending on your
location relative to their transmitters. The 18-minute cycle is not
synchronized across a
> "If it sweep perhaps a hundred kc at a time, and
at a rate of perhaps 10 sweeps per second,
then I would bet on OTH radar..."
More than likely, the sweeps you're referring to are created by this
monster...
http://www.raytheon.com/capabilities/rtnwcm/groups/public/documents/content/rtn_bus_ids_
> Not sure that Euro or Phoenix connectors were around (or at least readily
> available) when these beasties were built. Strictly 1970's low tech.
Bill AD5OL
They were around in 1995 -- the last time I had seen a Logitek Mixer
installed. Other options existed then as well, including 6, 9, 12, a
> Amen to Steve's comments on Logitek. They run 120V. from the back panel to
> the power switch on the front panel on a piece of Belden 8451 shieded pair
> audio cable bundled in with the microphone lines from the back panel
> connectors. Shall we say less than "best engineering practices".
And
> found a better rackmount mixer to replace it yet. I'd like to get a
> Pacific Recorders NewsMixer but haven't found one priced cheap enough
> for my budget.
I would check with Mooretronix. Although they primarily service PR&E
product, from time-to-time they also have reconditioned consoles av
Jim,
The LTSpice plot shows why the stock Astatic 2-stage pre-amp with its ~
470K-ohm input Z does little to extend low-end response.
The model also likely assumes a perfect C in series with the source. After
testing several D-104 cartridges of different vintage, I've come to the
conclusion t
> pair of high-mu triodes in a push-pull mic preamp. That way, each tube
> can
> have its own 10 meg grid leak to allow for a 20 megohm load on the xtal.
It's possible to duplicate a similar circuit using an FET differential
amplifier with dual FETs in a single package (e.g., 2SJ109), or a JFE
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