[Heathkit] Heathkit Digest, Vol 216, Issue 2 //SB-200 /accessory for sale
d b
hkdbpo at live.com
Fri Nov 4 13:28:12 EDT 2022
One SB-200 /accessories for sale
On CRA swaplist.
kgawlik at comcast.net
craswaplist <craswaplist at groups.io>
Back in the day, the SB-200 came with RCA/Banana input connectors. I have an SB200 original condition
with those connectors.
I have seen several out of box over the years that came with these banana connectors in the kit.
Others that were converted to either BNC or SO-239.
The output is SO-239 chassis mount. Original. So, from the Heathkit Transceiver to the amp, 72-75 ohm
impedance.
Is that a clue to the impedance range of the swr bridge?
Years ago, I asked one of the regulars here
why the build manual called for , I believe, 72 ohm cable(could have been 75 ohm) for the RF
connections.
His reply was that is what Heathkit designed the SB-200 to use,in a specific length.
More confusion.??
WB7TNE
________________________________
From: heathkit-bounces at mailman.qth.net <heathkit-bounces at mailman.qth.net> on behalf of heathkit-request at mailman.qth.net <heathkit-request at mailman.qth.net>
Sent: Wednesday, October 26, 2022 2:41 PM
To: heathkit at mailman.qth.net <heathkit at mailman.qth.net>
Subject: Heathkit Digest, Vol 216, Issue 2
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Today's Topics:
1. Re: SB200 SWR Meter (manualman at juno.com)
2. Re: SB200 SWR Meter (Kenneth G. Gordon)
3. Re: SB200 SWR Meter (Ron W4BIN)
4. Re: SB200 SWR Meter (Ron W4BIN)
5. Re: SB200 SWR Meter (arthur steinke)
----------------------------------------------------------------------
Message: 1
Date: Tue, 25 Oct 2022 19:33:16 -0400
From: <manualman at juno.com>
To: heathkit at mailman.qth.net
Subject: Re: [Heathkit] SB200 SWR Meter
Message-ID: <AABTXS6WZAJE2YJ2 at smtpout04.vgs.untd.com>
Content-Type: text/plain; charset=utf-8
I've never found the SWR position on the SB-200 to be accurate so I never
use it. Forward power is OK when just tuning for maximum power.
Diode anode connection on each sensing wire is critical and they must be
an identical dimension connection from each end.
I had one SB-200 years ago which, for whatever reason, one of the sense
wires was about 1/4 inch shorter then the other one. I replaced both
sense wires with two of equal length but didn't make much difference in
SWR reading. Also, the relay contacts can add a bump in the SWR reading.
Pete, wa2cwa
On Tue, 25 Oct 2022 22:42:06 +0000 (UTC) Bruce Hudler WK3A via Heathkit
<heathkit at mailman.qth.net> writes:
> Been working on a few SB200's lately and have a question on the SWR
> meter. Over the years I've not really paid any attention to them, as
> I guess we all have better things to measure with.
> The amp I'm working on seems to be not very accurate with the SWR on
> the antennas and the HN31 dummy load. It reads 1.5 to 1 on the dummy
> load. Even higher on antennas.
> This circuit and components are used in other stuff so I'm sure
> there are millions of them out there.
> Reworked the circuit with new 1N191 diodes, 100-ohm resistors ok, re
> centered the rods and measurements. No difference. Checked a couple
> of different bands, not much difference.
> Not much there, maybe they are all that way :)
> Any thoughts? Thanks
>
> Bruce WK3A
------------------------------
Message: 2
Date: Tue, 25 Oct 2022 22:30:51 -0700
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: heathkit at mailman.qth.net, <manualman at juno.com>
Subject: Re: [Heathkit] SB200 SWR Meter
Message-ID: <6358C60B.10058.265D86BA at kgordon2006.frontier.com>
Content-Type: text/plain; charset=US-ASCII
On 25 Oct 2022 at 19:33, manualman at juno.com wrote:
> I've never found the SWR position on the SB-200 to be accurate so I never
> use it. Forward power is OK when just tuning for maximum power.
> Diode anode connection on each sensing wire is critical and they must be
> an identical dimension connection from each end.
> I had one SB-200 years ago which, for whatever reason, one of the sense
> wires was about 1/4 inch shorter then the other one. I replaced both
> sense wires with two of equal length but didn't make much difference in
> SWR reading. Also, the relay contacts can add a bump in the SWR reading.
>
> Pete, wa2cwa
I own two SB-200s, and I am 100% with Pete on this issue. I never use the SWR function in
mine either.
Ken W7EKB
------------------------------
Message: 3
Date: Wed, 26 Oct 2022 06:30:36 -0400
From: Ron W4BIN <ka4inm at gmail.com>
To: heathkit at mailman.qth.net
Subject: Re: [Heathkit] SB200 SWR Meter
Message-ID: <1b52ba9d-1a11-7b82-6de3-3e3ae18d3e4a at gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
?Bruce Hudler WK3A via Heath-kit wrote:
> Been working on a few SB200's lately and have a question on the SWR meter. Over the years I've not really paid any attention to them, as I guess we all have better things to measure with.
> The amp I'm working on seems to be not very accurate with the SWR on the antennas and the HN31 dummy load. It reads 1.5 to 1 on the dummy load. Even higher on antennas.
> This circuit and components are used in other stuff so I'm sure there are millions of them out there.
> Reworked the circuit with new 1N191 diodes, 100-ohm resistors ok, re centered the rods and measurements. No difference. Checked a couple of different bands, not much difference.
> Not much there, maybe they are all that way? :)
> Any thoughts? Thanks
? I don't know, but could the bridge be set up for 75. ??
--
Ron W4BIN - Understanding is much better than
knowing how.MX
------------------------------
Message: 4
Date: Wed, 26 Oct 2022 10:57:27 -0400
From: Ron W4BIN <ka4inm at gmail.com>
To: h <heathkit at mailman.qth.net>
Subject: Re: [Heathkit] SB200 SWR Meter
Message-ID: <9b17dd30-338e-f8c1-a08c-5f622a56a13f at gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
?Bruce Hudler WK3A wrote:
> Thanks for the reply Ron.
> Never considered that but why would they do 75 ohms.
> I'll try connecting something 75 ohms with the amp off and see what
> happens.
? I have a Heath fone patch+SWR bridge+(possibly) a speaker of the SB
line that was
setup for 75. ? *? because we use RG59 and RG11 (73. ?)? coax with
dipoles, don't we?? I do. (or RG6)
?? * The IB tells how to convert it to 50. ?? (by changing several
resistors)
--
Ron W4BIN - Understanding is much better than
knowing how.MX
------------------------------
Message: 5
Date: Wed, 26 Oct 2022 15:41:46 -0500
From: arthur steinke <arttravels at comcast.net>
To: heathkit at mailman.qth.net
Subject: Re: [Heathkit] SB200 SWR Meter
Message-ID: <0c59afad-e731-aa2a-a509-cd9f64d410c8 at comcast.net>
Content-Type: text/plain; charset=UTF-8; format=flowed
OKAY,
Just tell this old fart of 85 years what the IB is.? I assume it is some
bulletin put out by someone.
Also where can one find it or obtain a copy.
WB9JKZ/Trustee W9LM and W9BSA
ART
------------------------------------------------------------------------------------------------------------------------------------------
On 10/26/2022 9:57 AM, Ron W4BIN wrote:
> ?Bruce Hudler WK3A wrote:
>
>> Thanks for the reply Ron.
>> Never considered that but why would they do 75 ohms.
>> I'll try connecting something 75 ohms with the amp off and see what
>> happens.
>
> ? I have a Heath fone patch+SWR bridge+(possibly) a speaker of the SB
> line that was
> setup for 75. ? *? because we use RG59 and RG11 (73. ?)? coax with
> dipoles, don't we?? I do. (or RG6)
>
> ?? * The IB tells how to convert it to 50. ?? (by changing several
> resistors)
>
------------------------------
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