Consider, though, that the logic levels have defined voltage tolerances and
that these need to be met.
The mid point (no man's land) can invoke false triggering.

The levels depend on the type of logic used.

73

David W Wood 

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Steve Dresser
Sent: Wednesday, October 22, 2014 11:18 PM
To: [log in to unmask]
Subject: Re: Has anyone here ever built a project from QST?

Steve,

From what I've heard, those values don't have to be very precise, so as =
long as the high ones are relatively high and the low ones are =
relatively low, the logic works.

Steve

----- Original Message -----=20
From: "Steve Forst" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 22, 2014 11:40
Subject: Re: Has anyone here ever built a project from QST?


>I don't have any real skill, but just took my time, and I was lucky=20
> enough to have everything I needed laying around,  so if it failed, no =

> big deal.
>=20
>=20
> Originally (in the 2000 literature) the values were 2  each of 100k =
and=20
> 47 k ohms.  In the 590's In Depth Manual, it was 2 each of 100k and =
22k=20
> ohms.
>=20
> Not sure why the change, but I used 22k and it works on both the 590 =
and=20
> 2000.
>=20
> Since the whole thing is based on grounding 2 microphone pins through =
a=20
> higher or lower resistance to get a particular action, Perhaps it is=20
> just that the spread between the 2 sets of values is greater  with =
100k=20
>  and 22k.
>=20
> 73, Steve KW3A
>=20
>=20
> On 10/22/2014 11:24 AM, Butch Bussen wrote:
>> I wish I had the skill to build such a box.  Do you recall value for =
the
>> resisters?
>> 73
>> Butch
>> WA0VJR
>> Node 3148
>> Wallace, ks.
>>
>>
>> On Wed, 22 Oct 2014, Steve Forst wrote:
>>
>>> Mike,
>>>
>>> Not from QST, but if you are in tinkering mode, an external box with
>>> extra pf keys  is nice to have for the 590.    Colin from this list =
had
>>> built one for his TS-2000  maybe 10 years ago, and I  did one about =
a
>>> year and a half ago.  Since both use the 8 pin round mic connector, =
it
>>> is interchangeable between the 2 radios.
>>>
>>> While the 590 has 2 pf keys on it, it is always nice to have more.  =
When
>>> you set up the pf keys to give voice announcements  in TX like swr,
>>> comp, and alc, it kind of uses up the 2 keys.
>>>
>>>
>>> A couple of momentary push button switches, microphone in and out, =
and
>>> some resistors, and you are in business.
>>>
>>> BTW, if you have a mic with up/down buttons (even the stock hand =
mic)
>>> and can do without the up/down function, the 590 lets you reassign =
them
>>> to act as pf keys.
>>>
>>> Good luck with the new radio.
>>>
>>> 73, Steve KW3A
>>>
>>>
>>> On 10/21/2014 6:56 PM, Mike Duke, K5XU wrote:
>>>> I'm just curious.
>>>>
>>>> I have applied a few of the Hints and Kinks through the years, and =
I
>>>> own a Tuna Tin 2 that someone else built.
>>>>
>>>> However, I have just recently bought the steel tape measure in =
order to
>>>> build the vertical from the August, 2014 issue.
>>>>
>>>
>>>
>>
>>
>>
>