More accolades from my Peers....

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  • Updated 3 years ago
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I was on 7138 KHz last night with a small roundtable which included stations in England. Three of us, including myself, were using 6300s. I was using a little extra gear (in order from my pie-hole):

1. Electro-voice RE320 Microphone. I had to kick in 30 dB of in-line attenuation in
the mic cord as the line level out on the Inovonics is WAYYYY too hot for the
front microphone pseudo-balanced Foster jack. The widget is a Hosa ATT448.

2. Symetrix 528E voice processor. No more than 6 dB audio compression. The compression ratio is about 4:1.

3. Innovonics 222 Limiter and Pre-Emphasis.

4. Legal Limit QRO HF2500DX amplifier at 1500W.

5. 40m inverted vee at 50' fed with RG213/U. The vee has a 5 KW Palomar Labs 1:1 balun at the feedpoint. The antenna conductors are 15 KV insulated wire. Since it is impossible at my QTH to run the wire in the free and clear, I must use this type wire for the intended power level as I don't want to ignite the trees in my backyard. Overkill? Perhaps. But, that's just me.

I do all my input audio equalization and compression outboard of the radio. The SmartSDR input sliders are flat across the board. I was running 3.1 KHz bandwidth LSB. Audio peaks were at -5.0 dBu on the Flex scale.

I received multiple excellent audio reports (unsolicited). The RE320 may be overkill but one can only equalize a middle to bottom line microphone so much IMHO.

This is not to say one HAS to do what I did to get good audio. One must begin by having a good platform to convert your audio to RF.

I am also restoring a Gates BC1T. I acquired the audio gear months ago in preparation for that project. I hadn't even thought about a new Flex at that time.

Play radio kiddies!


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Philip KA4KOE

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Posted 3 years ago

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Steve K9ZW, Elmer

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Thanks you for posting this write -up.

Agree on starting with a good microphone to work with a good base audio signal rather than trying to Doctor-Up replacement audio for what was not originally captured by a lesser microphone.