XVTR Out level

[w4sc-2]

At 15MHz you are starting to be out of the 20M passband filter, at 16MHz you are well out of the 20M pass band,,, the passband on 10M is around 2 or 3MHz wide and thus would provide the proper drive level for  144 (28MHz), 145 (29MHz), and 146 (30MHz) MHz operation.

 From the K3 users manual, pp71:

Band-Pass Filters (BPFs)
At back-left is the bank of ham-band BPFs. These filters are just wide enough to cover each ham band, so they provide good rejection of IMD products during both transmit and receive. Hi-Q components, including large toroids, ensure low loss and high signal-handling capability.

Regards de Ben W4SC

Sent from Mail for Windows 10

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[Gary Johnson]

Guess I’ll have to study the K3 block diagrams. For some reason I thought Xvrt Out didn’t go thru the BPFs.

-Gary NA6O

On Jul 8, 2019, at 5:14 PM, w4sc <[hidden email]> wrote:
>
> At 15MHz you are starting to be out of the 20M passband filter, at 16MHz you are well out of the 20M pass band,,, the passband on 10M is around 2 or 3MHz wide and thus would provide the proper drive level for  144 (28MHz), 145 (29MHz), and 146 (30MHz) MHz operation.
>  

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[Gary Johnson]

Sure enough, the BPFs are in the low-level RF path on TX and RX. Moral of the story is to choose a transverter with a 28 MHz IF when maximum usable frequency range is desired.

Gary NA6O
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[Conrad PA5Y]

Hi Gary could you perhaps chose 2 transverters 144MHz and 145MHz and set the levels accordingly? Fortunately all my transverters have a 28MHz IF. Another Elecraft 'surprise'. The worst one for me is the K3S TX IMD on 6m, its really quite awful and not good enough for me to use. So I suppose that I will end up using the transverter port for 6m as well. Its a shame because the RX is outstanding.


You will love the performance of the Kuhne transverter with the K3, its the best combination that I have found for the band.


73


Conrad PA5Y


________________________________
From: [hidden email] <[hidden email]> on behalf of Gary Johnson <[hidden email]>
Sent: 09 July 2019 06:10
To: [hidden email]
Subject: Re: [Elecraft] XVTR Out level

Sure enough, the BPFs are in the low-level RF path on TX and RX. Moral of the story is to choose a transverter with a 28 MHz IF when maximum usable frequency range is desired.

Gary NA6O
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