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Re: LF: Re: FT-817 at LF/MF

To: [email protected]
Subject: Re: LF: Re: FT-817 at LF/MF
From: Dexter McIntyre W4DEX <[email protected]>
Date: Mon, 31 Aug 2009 10:07:01 -0400
In-reply-to: <[email protected]>
References: <92C6FA2037874B9888C28DDBF9096246@JimPC> <[email protected]> <AC8257E889D74628857985598FC9B96D@JimPC> <[email protected]>
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Roger Lapthorn wrote:

On 137 kHz the FT817 RX is unusable and I've been trying with a simple SBL1 up-converter with some post mixer gain......
Roger,

I have a FT817 I bought used a few years ago. I got a real deal on it because it had no output power. I bypassed the dead FETs and got +10 dbm out on 144 mc which is exactly what I wanted for a microwave IF. I have used it for 500 and 137 kc receiving. Works great with no help on 500 kc but is a bit weak on 137 kc unless it's connected to a big antenna. On my transmit antenna it needs no help but for best receiving I use an amplified balanced loop. With that antenna the FT817 works as good as any receiver I've used for QRSS reception.

Below is the receive sensitivity I measured to produce a decent audible CW 
signal:

100 khz   1000 uv
125 khz   5 uv
150 khz   3 uv
175 khz   1.5 uv
200 khz   1 uv
250 khz   0.5 uv
300 khz   0.2 uv
350 khz   0.1 uv
400 khz    <0.1 uv
500 khz    <0.1 uv

Dex


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