[Test-Equipment] RF spectrum analysis

[Dave Brown]

Actually, I lied- there IS a driver out connection- its been a few 
years.........
73
 Dave, ZL3FJ

----- Original Message ----- 
From: "Dave Brown" <tractorb at ihug.co.nz>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Tuesday, January 21, 2014 10:14 AM
Subject: Re: [Test-Equipment] RF spectrum analysis


> Yaesu FT757 GX II will put out low power down there but there's no access 
> to the driver output-just the normal  PA output.
> The PA will shut down at more than a watt or two out with continuous 
> keydown, maybe less, depending on how low in frequency you want to go.
> Rig has to be 'broadbanded' first, of course. (undocumented black 
> pushbutton on pcb behind display)
> Dave
> ZL3FJ
>
> ----- Original Message ----- 
> From: "Carl" <km1h at jeremy.mv.com>
> To: <garyschafer at comcast.net>; "Discussion of Electronic Test Equipment" 
> <test-equipment at mailman.qth.net>
> Sent: Tuesday, January 21, 2014 8:59 AM
> Subject: Re: [Test-Equipment] RF spectrum analysis
>
>
>> Is there any older xcvr, especially KW that will TX below 500 KHz at the 
>> pre driver stage? Even 1 mw is fine.
>> Ive been unable to find the unlock secret for my TS-940 and TS-950SD.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- 
>> From: "Gary Schafer" <garyschafer at comcast.net>
>> To: "'Discussion of Electronic Test Equipment'" 
>> <test-equipment at mailman.qth.net>
>> Sent: Monday, January 20, 2014 12:14 PM
>> Subject: Re: [Test-Equipment] RF spectrum analysis
>>
>>
>>> One of the best and most economical pieces of test equipment is a ham
>>> transceiver such as an older Kenwood TS430. Remove the diode that allows
>>> general coverage and you have a continues coverage receiver and signal
>>> generator from around 50 kHz to 30 MC.
>>>
>>> You can use the receiver as a manual tuned spectrum analyzer, signal 
>>> level
>>> meter, frequency meter etc. You can even measure intermodulation levels
>>> using the CW filter.
>>>
>>> In the transmit mode (be care full not to turn the carrier level up too
>>> high) you have a signal generator with very accurate frequency 
>>> calibration
>>> with variable level although uncalibrated level. Use with an external 
>>> step
>>> attenuator as a great enhancement.
>>>
>>> On a limited budget something like this will do a lot for you.
>>> I have spectrum analyzers, tracking generators, scopes, signal level 
>>> meters
>>> various analog and synthesized signal generators etc. But I still often 
>>> use
>>> the transceiver for quick and easy checks of some things.
>>>
>>> 73
>>> Gary  K4FMX
>>>
>>>
>>>> -----Original Message-----
>>>> From: test-equipment-bounces at mailman.qth.net [mailto:test-equipment-
>>>> bounces at mailman.qth.net] On Behalf Of David
>>>> Sent: Sunday, January 19, 2014 10:54 PM
>>>> To: Discussion of Electronic Test Equipment
>>>> Subject: Re: [Test-Equipment] RF spectrum analysis
>>>>
>>>> On Sun, 19 Jan 2014 21:52:47 -0500 (EST), you wrote:
>>>>
>>>> >&gt; What I'm mostly interested in is ham receiver design, building,
>>>> and
>>>> >&gt; alignment. So, that would involve looking at the passbands of the
>>>> tuned
>>>> >&gt; circuits associated with RF amplifiers, mixers, and IF stages,
>>>> including
>>>> >&gt; crystal or other types of filters. Perhaps 1 kHz to 100 kHz wide
>>>> at a center
>>>> >&gt; frequency of  around 2 mhz. Of course it would be nice to be able
>>>> to look at
>>>> >&gt; RF amplifier circuits at up to 30 mHz, as it's the good old HF
>>>> region that
>>>> >&gt; I'm interested in.
>>>> >
>>>> >Doesn't it seem like this requirement can be met with a sweep 
>>>> >generator
>>>> and oscilloscope?
>>>> >
>>>> >Wayne
>>>> >WB4OGM
>>>>
>>>> I have done this before but it is really only feasible if low accuracy
>>>> is
>>>> acceptable.
>>>>
>>>> The sweep generator should have a marker output if any frequency
>>>> accuracy is
>>>> required but an alternative is to use an oscilloscope which has a gated
>>>> timer
>>>> counter but that is a rare feature and offhand I do not know of any
>>>> modern
>>>> oscilloscopes which support it.  The Tektronix 7000 series can and 
>>>> maybe
>>>> the
>>>> 2247A or the 2465 series with the right options can also.
>>>>
>>>> Amplitude resolution will be good but the dynamic range will be 
>>>> terrible
>>>> without
>>>> logarithmic scaling.
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>>>
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>>
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