Ok, how fast is the wavetek signal generator?
if it's at least 2 mhz, and can put out a square wave, then try that.?
You're looking for significant edge rounding at any frequency from 2 Mhz
on (the higher, the more rounding) in the 20 Mhz position.? You need
about 10x the bandwidth to reproduce a decent square wave.? i.e. 2 Mhz
needs 20 Mhz bandwidth because of the harmonics that make the square
wave square.? That's why I suggested something around 10 to 20 Mhz.?
You'd be able to see the effects.? The closer to the 2 Mhz you get (and
below), the less you'll see the effect of the bandwidth.
See if tek WIKI has the service manual.
If you can breadboard a TTL oscillator, that might help.? Same
restrictions on frequency.
Harvey
On 10/14/2023 12:02 PM, Walt KA2NJF via groups.io wrote:
> Harvey,
>
> The test equipment I have is:
> 1. Wavetek Signal Generator
> 2. HP 410C VTVM
> 3. Sinometer Frequency Counter
> 4. Tel 2445 Scope
>
> It looks like I will have to purchase some more equipment if funds let
> me !!
> I will remove the case and blow out the dust and look at the fan. I
> will reoil it if possible.
> I don¡¯t have a service manual.
>
> Walt
>
>
> Sent from the all new AOL app for iOS
> <>
>
> On Saturday, October 14, 2023, 00:34, Harvey White
> <
madyn@...> wrote:
>
>? ? I'd say anything between 10 and 20.? What you're looking for is the
>? ? effect of the 20 Mhz bandwidth reduction.? The higher the
>? ? frequency, the
>? ? more obvious.
>
>? ? Do NOT couple a transmitter directly into the scope, use a dummy
>? ? load on
>? ? the transmitter, and pick up a signal with a wire loop. SA's and
>? ? Scopes
>? ? cannot tolerate wattage from a transformer.? You could use a 5 Mhz
>? ? square wave and look for the edge to see how it changes, that
>? ? works, too.
>
>? ? Harvey
>
>
>? ? On 10/13/2023 11:33 PM, Walt KA2NJF via groups.io wrote:
>? ? > Harvey,
>? ? >
>? ? > At the present time I have nothing to generate a 20 MHZ signal
>? ? with.
>? ? > Will it work with a 20 MHZ RF signal ??
>? ? >
>? ? > Walt
>? ? >
>? ? >
>? ? > Sent from the all new AOL app for iOS
>? ? >
>? ? <>
>? ? >
>? ? > On Friday, October 13, 2023, 21:45, Harvey White
>? ? > <
madyn@...> wrote:
>? ? >
>? ? >? ? Take a 20 Mhz square wave and look at it on 20 Mhz bandwidth,
>? ? then
>? ? >? ? go to
>? ? >? ? full bandwidth.? If that doesn't give two different results, then
>? ? >? ? that
>? ? >? ? tells you a lot.
>? ? >
>? ? >? ? Harvey
>? ? >
>? ? >
>? ? >? ? On 10/13/2023 8:07 PM, Walt KA2NJF via groups.io wrote:
>? ? >? ? > Davy,
>? ? >? ? >
>? ? >? ? > I have tried recycling all the switches, push buttons, and
>? ? rotary
>? ? >? ? > switches with no change in the Tek 2445 response. I even looked
>? ? >? ? for a
>? ? >? ? > master reset switch. I have tried recycling the push buttons,
>? ? >? ? switchs
>? ? >? ? > and rotary switches on and off for the past three or four
>? ? days. The
>? ? >? ? > last time I remember it working was a month or so ago. If you
>? ? >? ? come up
>? ? >? ? > with any more suggestions I am all ears.
>? ? >? ? >
>? ? >? ? > Thanks,
>? ? >? ? > Walt, KA2NJF
>? ? >? ? >
>? ? >? ? >
>? ? >? ? > Sent from the all new AOL app for iOS
>? ? >? ? >
>? ? >? ?
>? ? <>
>? ? >? ? >
>? ? >? ? > On Friday, October 13, 2023, 17:40, Dave Casey
>? ? >? ? <
polara413@...>
>? ? >? ? > wrote:
>? ? >? ? >
>? ? >? ? >? ? Walt -
>? ? >? ? >
>? ? >? ? >? ? Is the 20 Mhz BW Limit pushbutton (located directly
>? ? above the Ch2
>? ? >? ? >? ? Volts/Div knob) depressed? If it is not depressed,
>? ? perhaps the
>? ? >? ? >? ? switch has gotten dirty and cycling it a few times will
>? ? resolve
>? ? >? ? >? ? your issue?
>? ? >? ? >
>? ? >? ? >? ? Dave Casey
>? ? >? ? >
>? ? >? ? >? ? On Fri, Oct 13, 2023 at 3:25?PM Walt KA2NJF via groups.io
>? ? >? ? >? ? <> <wmilton2359@...>
>? ? wrote:
>? ? >? ? >
>? ? >? ? >? ? ? ? Hey,
>? ? >? ? >
>? ? >? ? >? ? ? ? I just joined the group and my name is Walter,
>? ? KA2NJF I am 80
>? ? >? ? >? ? ? ? years old. My Tektronix is in need of service. Is
>? ? there any
>? ? >? ? >? ? ? ? service deposit or any one in the South Jersey or
>? ? South East
>? ? >? ? >? ? ? ? PA who works on this piece of equipment? I can not
>? ? get any
>? ? >? ? >? ? ? ? frequency reading above 20 MHZ and this is a 150 MHZ
>? ? scope.
>? ? >? ? >
>? ? >? ? >? ? ? ? Thanks,
>? ? >? ? >? ? ? ? Walt, KA2NJF
>? ? >? ? >
>? ? >? ? >
>? ? >? ? >? ? ? ? Sent from the all new AOL app for iOS
>? ? >? ? >
>? ? >? ?
>? ? <>
>? ? >? ? >
>? ? >? ? >
>? ? >
>? ? >
>? ? >
>? ? >
>? ? >
>? ? >
>
>
>
>
>
>
Walt KA2NJF