[Milsurplus] More TCS questions

[Bob Wilder]

 From what I have found the antenna tuner was designed with one purpose in mind and 
that was to use the transmitter with the standard 30 foot base fed vertical standard
aboard naval ships.  With all other antennas, it is anyones guess how the transmitter
will work with other type antennas.

Bob, AF2HD/WW2LST op


At 10:39 AM 12/8/2003 -0500, Ray Fantini wrote:

>Have the TCS transmitter up and running with a new power supply, have
>used the radio on 160, 80 and 40 meters and have a couple questions.
>First, what's is the external antenna box used for? in operating the
>radio with a 40 meter inverted V the radio loads and operates fine 40
>and 80 meters, although I do not see much antenna current on 80 and only
>about a half amp on 40. The radio gets out well. If I use the external
>antenna tuner for the TCS I can get lots more antenna current but the
>signal to the antenna is less, this is according to readings by a field
>strength meter, also have noticed the receiver sensitivity drops way
>down using the tuner set for maximum current from the transmitter.
>My question is was the tuner only intended to be used a base-loading
>coil for a short whip? Is it to be bypassed when the radio is used on a
>long wire antenna, I found my best results with it bypassed, in the
>number six position. Have tried the radio with a short antenna, a 10
>meter sloper, the radio will load but with poor performance. Is their
>any idea of what type of long wire should be used with the TCS?
>Second, the antenna capacitor. There is a capacitor that can be
>switched out, in series or parallel with the output of the transmitter,
>what is the recommended setting for this capacitor? Have found that I
>can get the transmitter to tune both with and without the capacitor
>switched in, have found that transmitter works best on 40 with cap in
>series, at least into the V, dose anyone have the approved procedures
>for tuning the transmitter, other then following the letters.
>Third, harmonic suppression. The harmonic suppression on a radio of
>this age is good on 40 meters, with second and third harmonic being over
>60 db down, 80 is about the same, when using the radio on 160 have
>noticed that the second and third harmonic come up to about 30 db below
>the carrier. The antenna tuner only appears to make this problem worse.
>The 40 meter reading were into a 50 ohm load with a sample from a bird
>thru line, but did the rest of the readings just using the 40 meter
>antenna. Anyone have any idea what the transmitters output impendence
>really is? 
>Ray Fantini KA3EKH
>
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Bob & Carole Wilder
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