[Test-Equipment] RF spectrum analysis

[Carl]

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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