[1000mp] Interface to Collins 30S1

Mon, 7 Jan 2002 13:04:15 -0600

I have a Collins 30S1 and when I looked at the ALC requirements I found that
the 30S1 ALC output is a positive voltage and the ALC of the TS950 was based
upon a negative voltage input. I did think about replacing the tube dual
diode rectifier (12AL5 as I recall) with silicon diodes.
After checking I found that throttling down the transceiver output and using
the transceiver ALC gave very satisfactory results. Over driving the
transceiver or using an irrational amount of compression (often seems to be
the norm for some folks) causes predictable lousy output.

The time constants of analog meters are such that one should expect to see
peak meter needle readings of about 10% to 15% of the ACTUAL peak power
output. If you are seeing peak output readings on an analog meter (that is
not in a special peak output reading circuit) that show 1 KW or more output
you are most likely operating with too much power (even if the amplifier can
take it you are probably exceeding FCC rules). If the amplifier is not
capable of clean operation at 5 to 10 KW power output peaks, you are
probably 'messing' up the band operating in that fashion.

Tod, KOTO

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Pete Smith
Sent: Monday, January 07, 2002 4:26 AM
To: [email protected]
Subject: Re: [1000mp] Interface to Collins 30S1

At 04:58 AM 1/7/02 -0500, you wrote:
>I wonder if Yaesu knows what a source follower is. I'm not impressed
>with their internal ALC. here's a little blurb on ALC. Six paragraphs
>down,
>
>http://www.hamelectronics.com/k1deu/pages/ham/projects/ft-1k/ft-1k_index.ht
ml
>
>Paul Baldock wrote:
>>
>> Has anybody interfaced their FT1000MP MKV with the Collins 30S1 Linear?.
>>
>> The Collins 30S1 ALC seems too high impedance to drive the 30K Ohms of
the
>> Yaesu. I've tried a buffer but get strange results.
>>
>> It was "plug and play" with my TS930.

This is kinda mystifying.  Seems to me that if the ALC voltage provided by
an amplifier from the 50s was anything like correct for a solid-state
transceiver from the 90s (or the 80s for that matter), it would be nothing
but pure luck.

73, Pete N4ZR

The revised World Contest
Station Database
is online at www.pvrc.org

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