[Boatanchors] BK Precision 1405?

[Richard Post]

Eugene,

I concur with Joe.

What you have is a scope with recurrent sweep as opposed to triggered 
sweep. I have a B&K Precision 1403B  which is a cute little recurrent 
sweep scope good for about 5 MHz (that's the usable bandwidth of the 
vertical amp) with a 3 inch scope tube.  It has the same sweep range 
markings you describe.

I also have a B&K Precision 1460 which is a triggered scope with a 
10MHz bandwidth and with a 5 inch scope tube.  Both are older 
oscilloscopes but not sweep generators.

Sounds as if the 1405 is similar to the 1403B.  If so, it is useful 
for monitoring AM modulation which is what the little 1403B does for 
me.  I like the 1403B for its portability.

Neither scope can hold a candle to my 100 MHz Tektronix, but I seldom 
need the bandwidth of the Tek.  Either one of the B&K cheap scopes 
can be useful within their respective frequency limits for a great 
deal of radio servicing work.  But a signal generator with a sweep 
capability is a totally different animal.  You  need one of those 
and, of course, the separate scope to view the waveform of the IF 
peak.

As Joe said, B&K scopes go cheap at hamfests.  The 1403B was given me 
by a friend because the "scope tube went bad".  I suggested that the 
high voltage likely had a problem, and I could repair it for him. 
Friend said he didn't want it back.  Replaced the high voltage diode 
and a couple of small high voltage Japanese oil-filled caps that had 
totally lost their capacity.  First time I had ever seen a 
non-electrolytic cap do that.  Didn't think that was possible.   Used 
a couple of cheap ceramics in their place.  Works great.

Best of luck with the scope,

Rich

Boatanchor pix

<http://www.qsl.net/kb8tad>


At 12:36 PM -0500 4/8/05, Joe Eide wrote:
>Eugene,
>
>I would guess that it is nothing more than a 5 mhz B&K oscilloscope 
>worth around $25.
>
>Joe
>
>
>
>Eugene Hertz wrote:
>
>>Is anyone familiar with this unit? I was wondering what it can be 
>>used for, with regard to aligning or servicing radios.  I saw some 
>>references on the internet that it was a 5Mhz sweeper, but looking 
>>at the face of it it appears the highest sweep range is 
>>10khz-100khz.
>>
>>It seems to have a built in scope, so I just wonder...Can anyone 
>>give me some input on the usfulness of such an item?  I am just 
>>getting started in learning how to align an sp600 and it seems it a 
>>sweep generator can be useful in aligning the IF and some other 
>>things.  SP600 has 455khz 1st IF and 3.955Mhz 2nd IF, but I dont 
>>know if this unit can sweep thru those frequencies. My other 
>>interest in some kind of unit like this has to do with just 
>>learning about how circuits work for things like filters, etc.
>>
>>thanks
>>Eugene
>>
>>