ian hope (2E0IJH)
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20db gain on 1296mhz is far too much, I concure with Coiin I have the transverter and matching Amp,so that has the built in preamp,using a Ft726 as IF my Rx gain is backed right down.
Sent: Thursday, November 05, 2020 at 12:26 AM
From: "Colin Ranson" <g8lbs@...>
To: "UKMicrowaves@groups.io" <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] SG-Labs,
I have the 23cm and 13cm transverters, I use an ICOM IC-706MK2g as the IF. I would not want anymore than 10db gain and any more is not nesseccary, (unless you have a very deaf IF RX ?) in fact I have the ‘RX GAIN’ pot in the transverter backed off. I have mast head pre-amps (in the loft under the mast) the 23cm one has 9db gain and the 13cm one 13db gain. Absolutely more than enough.
Colin de G8LBS.
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The only trouble with SG Lab tranverters is the low rx gain, 10db. The Kuhne ones have 20db.
The SGL amp for 23 and 13 has an LNA but again, only 10db.
I think Mr H really needs to improve that on his next designs.
There's also a problem with timing on the rf v ptt switching, if you run the pa off the ptt there's a double kick in the pa dropping and going back to rx.
I have the 23, 13 and 9 units and they are very good save for the above caveat.