Oh, sorry, I was thinking of the 2k ultra.
Have you tried a shorter cable between the transceiver and the amp?
Victor 4X6GP
On Mon, Dec 11, 2023, 19:47 Carl Braun <Carl.Braun@cattron.com> wrote:
> Hello Victor
>
> I believe the adjustable coils are on the older Henry amps. No inductors
> like that on the 3K and 8K ultra two-piece amps
>
> Carl
>
> Get Outlook for iOS <https://aka.ms/o0ukef>
> ------------------------------
> *From:* Amps <amps-bounces@contesting.com> on behalf of Victor Rosenthal <
> k2vco.vic@gmail.com>
> *Sent:* Monday, December 11, 2023 11:38:15 AM
> *To:* amps@contesting.com <amps@contesting.com>
> *Subject:* Re: [Amps] Starting up a NEW Henry amp
>
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>
> Carl,
>
> I understand that the SWR as shown on the meter in the transceiver is
> high when the amplifier is operating, but the SWR on the line to the
> antenna is normal. Is that correct?
>
> The Henry Ultra amps have pi-network input circuits for each band. They
> have adjustable coils, L1-L6 on the schematic. If someone has
> misadjusted them, you can see high SWR.
>
> Does this happen on all bands or just some of them?
>
> 73,Victor, 4X6GP
> Rehovot, Israel
> Formerly K2VCO
> CWops no. 5
> http://www.qsl.net/k2vco/
>
>
> On 11/12/2023 18:08, Carl Braun wrote:
> > Hello John
> >
> > I am seeing high VSWR on my 7800 when using the Henry ULTRA amp. I
> don't hear or see RFI on my monitored signal but the VSWR meter is
> certainly responding differently to the Henry amp than it does to my Alpha
> amp. By engaging the tuner on the 7800 I can get MOST of the Henry's VSWR
> down to under 1.5 or so. Placing a W2FMI line isolator (1:1) in between
> the 7800 and the Henry did nothing to lessen the high VSWR I saw coming
> back at the transceiver. It should be noted that the RF console was
> approx. 3' from the transceiver at the time of testing with a 25' RG-58
> exciter coa from the rig to the input of the amp.
> >
> > I've pulled my dummy load out of storage and am ready to test the amp
> with that. The antennas I have been using with the Henry are all flat at
> their respective frequencies. I see less than 1.3:1 at 1.5KW on my
> Powermaster II monitor, and on the 7800 VSWR meter, when using the Alpha.
> Palomar is sending over a couple of choke kits for the radio room and the
> antenna feeds. Choke kits for the TXCVR and AMP as well as 1:1 chokes for
> vertical antenna feed points. As one responder noted; Henry basically
> suggests you don't use the tuner in the TXCVR to knock down any VSWR. I
> plan on asking Dennis Pickering about the issue next time I have him on the
> phone.
> >
> > More experimenting later this week as I am currently wiring in a 240VAC
> feed on the opposite side of the radio room so I don't have to test the
> Henry consoles in close proximity of the operating position. More updates
> afterward.
> >
> > Carl W9LF
> >
> > -----Original Message-----
> > From: Amps <amps-bounces@contesting.com> On Behalf Of john@kk9a.com
> > Sent: Wednesday, December 6, 2023 9:43 PM
> > To: amps@contesting.com
> > Subject: Re: [Amps] Starting up a NEW Henry amp
> >
> > [You don't often get email from john@kk9a.com. Learn why this is
> important at https://aka.ms/LearnAboutSenderIdentification ]
> >
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> attachment nor links in the message.
> >
> > Are you saying that the Henry is causing RFI in your transceiver? Is
> this occurring with a dummy load or does you antenna feedline have CMC?
> >
> > John KK9A
> >
> >
> >
> > Carl Braun W9LF wrote?
> >
> > By enabling the tuner in the rig I can knock down most of the SWR when
> running the Henry's but I don't have to do that with my other amp. One
> difference... I do have a longer coax run (25') from the Henry's back to
> the PM II watt meter . The Alpha has a three ft (3') jumper from the amp to
> the watt meter. I'm going to shorten the coax from the Henry RF consoles to
> the coupler to 8' or so to see if that lessens any of the RF coming back to
> the rig. I do have a W2FMI line isolator in the line going to the amps with
> no visible changes. More parts are coming like RFI kits for the amp and
> transceiver, a 1:1 unun for the output of the amp and one for the base of
> the antenna.
> > Any other Suggestions?
> >
> > Thanks
> >
> > Carl W9LF
> >
> >
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