[ARC5] Fw: Model 19 MKll

[Dennis Monticelli]

With my T-22 the continuously running oscillator (it runs during receive
periods as well) does not create a backwave issue because the PA pulls the
osc about 2KHz upon key down.  Regulation of all voltages eliminates chirp.

Dennis AE6C

On Mon, Feb 22, 2010 at 11:17 PM, Henry Mei'l's <meils at get2net.dk> wrote:

> Hi Meyer and everyone else
> I used the method of running the a keying (T/R) relay in series with the
> 1625 cathodes of my ARC-5 xmtrs back in the 50's. It does gives you cathode
> bias-but you do lose some power because of the voltage drop, depending on
> the relay coil resistance- I suppose you could have a pair of contacts that
> short out the relay coil when it kicks in- wonder what that would do to the
> signal (a kind of burp?).
>
> Of course, with the oscillator running, you wont be able to work QSK and
> you
> probably will have a readable backwave -- I do when keying the cathodes of
> my TCS final, with oscillator and multiplier stage unkeyed -- same with the
> ARC-5's  I keyed that way.
> You all are probably  aware of all this-- so call it nostalgia.
>
> 73s, Henry
>
> ----- Original Message -----
> From: "Meyer Gottesman" <wrecktech at yahoo.com>
> To: "Discussion of AN/ARC-5 military radio equipment."
> <arc5 at mailman.qth.net>
> Sent: Tuesday, February 23, 2010 12:52 AM
> Subject: Re: [ARC5] Fw: Model 19 MKll
>
>
> I stripped the usesless UHF out of my WS 19 also. The 80 and 40 CW
> performance is FB. As said before, the only nasty element is the CW keying
> being at +275 volts. The R/T relay can become the 807 cathode resistor. If
> the VFO runs all the time when transmitting and ONLY the 807 cathode is
> keyed, there should be little or no chirp and I do not recall the drift
> being too bad.
>
> 73,
>
> Meyer Gottesman, W6GIV
> Macon, GA
>
>
>
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